| /* vi: set sw=4 ts=4: */ |
| /* |
| * httpd implementation for busybox |
| * |
| * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org> |
| * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| * |
| ***************************************************************************** |
| * |
| * Typical usage: |
| * For non root user: |
| * httpd -p 8080 -h $HOME/public_html |
| * For daemon start from rc script with uid=0: |
| * httpd -u www |
| * which is equivalent to (assuming user www has uid 80): |
| * httpd -p 80 -u 80 -h $PWD -c /etc/httpd.conf -r "Web Server Authentication" |
| * |
| * When an url starts with "/cgi-bin/" it is assumed to be a cgi script. |
| * The server changes directory to the location of the script and executes it |
| * after setting QUERY_STRING and other environment variables. |
| * |
| * If directory URL is given, no index.html is found and CGI support is enabled, |
| * cgi-bin/index.cgi will be run. Directory to list is ../$QUERY_STRING. |
| * See httpd_indexcgi.c for an example GCI code. |
| * |
| * Doc: |
| * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html |
| * |
| * The applet can also be invoked as an url arg decoder and html text encoder |
| * as follows: |
| * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World" |
| * bar=`httpd -e "<Hello World>"` # encode as "<Hello World>" |
| * Note that url encoding for arguments is not the same as html encoding for |
| * presentation. -d decodes an url-encoded argument while -e encodes in html |
| * for page display. |
| * |
| * httpd.conf has the following format: |
| * |
| * H:/serverroot # define the server root. It will override -h |
| * A:172.20. # Allow address from 172.20.0.0/16 |
| * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127 |
| * A:10.0.0.0/255.255.255.128 # Allow any address that previous set |
| * A:127.0.0.1 # Allow local loopback connections |
| * D:* # Deny from other IP connections |
| * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page |
| * I:index.html # Show index.html when a directory is requested |
| * |
| * P:/url:[http://]hostname[:port]/new/path |
| * # When /urlXXXXXX is requested, reverse proxy |
| * # it to http://hostname[:port]/new/pathXXXXXX |
| * |
| * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/ |
| * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/ |
| * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/ |
| * /adm:root:* # or user root, pwd from /etc/passwd on urls starting with /adm/ |
| * /wiki:*:* # or any user from /etc/passwd with according pwd on urls starting with /wiki/ |
| * .au:audio/basic # additional mime type for audio.au files |
| * *.php:/path/php # run xxx.php through an interpreter |
| * |
| * A/D may be as a/d or allow/deny - only first char matters. |
| * Deny/Allow IP logic: |
| * - Default is to allow all (Allow all (A:*) is a no-op). |
| * - Deny rules take precedence over allow rules. |
| * - "Deny all" rule (D:*) is applied last. |
| * |
| * Example: |
| * 1. Allow only specified addresses |
| * A:172.20 # Allow any address that begins with 172.20. |
| * A:10.10. # Allow any address that begins with 10.10. |
| * A:127.0.0.1 # Allow local loopback connections |
| * D:* # Deny from other IP connections |
| * |
| * 2. Only deny specified addresses |
| * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255 |
| * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255 |
| * A:* # (optional line added for clarity) |
| * |
| * If a sub directory contains config file, it is parsed and merged with |
| * any existing settings as if it was appended to the original configuration. |
| * |
| * subdir paths are relative to the containing subdir and thus cannot |
| * affect the parent rules. |
| * |
| * Note that since the sub dir is parsed in the forked thread servicing the |
| * subdir http request, any merge is discarded when the process exits. As a |
| * result, the subdir settings only have a lifetime of a single request. |
| * |
| * Custom error pages can contain an absolute path or be relative to |
| * 'home_httpd'. Error pages are to be static files (no CGI or script). Error |
| * page can only be defined in the root configuration file and are not taken |
| * into account in local (directories) config files. |
| * |
| * If -c is not set, an attempt will be made to open the default |
| * root configuration file. If -c is set and the file is not found, the |
| * server exits with an error. |
| */ |
| //config:config HTTPD |
| //config: bool "httpd (32 kb)" |
| //config: default y |
| //config: help |
| //config: HTTP server. |
| //config: |
| //config:config FEATURE_HTTPD_RANGES |
| //config: bool "Support 'Ranges:' header" |
| //config: default y |
| //config: depends on HTTPD |
| //config: help |
| //config: Makes httpd emit "Accept-Ranges: bytes" header and understand |
| //config: "Range: bytes=NNN-[MMM]" header. Allows for resuming interrupted |
| //config: downloads, seeking in multimedia players etc. |
| //config: |
| //config:config FEATURE_HTTPD_SETUID |
| //config: bool "Enable -u <user> option" |
| //config: default y |
| //config: depends on HTTPD |
| //config: help |
| //config: This option allows the server to run as a specific user |
| //config: rather than defaulting to the user that starts the server. |
| //config: Use of this option requires special privileges to change to a |
| //config: different user. |
| //config: |
| //config:config FEATURE_HTTPD_BASIC_AUTH |
| //config: bool "Enable HTTP authentication" |
| //config: default y |
| //config: depends on HTTPD |
| //config: help |
| //config: Utilizes password settings from /etc/httpd.conf for basic |
| //config: authentication on a per url basis. |
| //config: Example for httpd.conf file: |
| //config: /adm:toor:PaSsWd |
| //config: |
| //config:config FEATURE_HTTPD_AUTH_MD5 |
| //config: bool "Support MD5-encrypted passwords in HTTP authentication" |
| //config: default y |
| //config: depends on FEATURE_HTTPD_BASIC_AUTH |
| //config: help |
| //config: Enables encrypted passwords, and wildcard user/passwords |
| //config: in httpd.conf file. |
| //config: User '*' means 'any system user name is ok', |
| //config: password of '*' means 'use system password for this user' |
| //config: Examples: |
| //config: /adm:toor:$1$P/eKnWXS$aI1aPGxT.dJD5SzqAKWrF0 |
| //config: /adm:root:* |
| //config: /wiki:*:* |
| //config: |
| //config:config FEATURE_HTTPD_CGI |
| //config: bool "Support Common Gateway Interface (CGI)" |
| //config: default y |
| //config: depends on HTTPD |
| //config: help |
| //config: This option allows scripts and executables to be invoked |
| //config: when specific URLs are requested. |
| //config: |
| //config:config FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| //config: bool "Support running scripts through an interpreter" |
| //config: default y |
| //config: depends on FEATURE_HTTPD_CGI |
| //config: help |
| //config: This option enables support for running scripts through an |
| //config: interpreter. Turn this on if you want PHP scripts to work |
| //config: properly. You need to supply an additional line in your |
| //config: httpd.conf file: |
| //config: *.php:/path/to/your/php |
| //config: |
| //config:config FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV |
| //config: bool "Set REMOTE_PORT environment variable for CGI" |
| //config: default y |
| //config: depends on FEATURE_HTTPD_CGI |
| //config: help |
| //config: Use of this option can assist scripts in generating |
| //config: references that contain a unique port number. |
| //config: |
| //config:config FEATURE_HTTPD_ENCODE_URL_STR |
| //config: bool "Enable -e option (useful for CGIs written as shell scripts)" |
| //config: default y |
| //config: depends on HTTPD |
| //config: help |
| //config: This option allows html encoding of arbitrary strings for display |
| //config: by the browser. Output goes to stdout. |
| //config: For example, httpd -e "<Hello World>" produces |
| //config: "<Hello World>". |
| //config: |
| //config:config FEATURE_HTTPD_ERROR_PAGES |
| //config: bool "Support custom error pages" |
| //config: default y |
| //config: depends on HTTPD |
| //config: help |
| //config: This option allows you to define custom error pages in |
| //config: the configuration file instead of the default HTTP status |
| //config: error pages. For instance, if you add the line: |
| //config: E404:/path/e404.html |
| //config: in the config file, the server will respond the specified |
| //config: '/path/e404.html' file instead of the terse '404 NOT FOUND' |
| //config: message. |
| //config: |
| //config:config FEATURE_HTTPD_PROXY |
| //config: bool "Support reverse proxy" |
| //config: default y |
| //config: depends on HTTPD |
| //config: help |
| //config: This option allows you to define URLs that will be forwarded |
| //config: to another HTTP server. To setup add the following line to the |
| //config: configuration file |
| //config: P:/url/:http://hostname[:port]/new/path/ |
| //config: Then a request to /url/myfile will be forwarded to |
| //config: http://hostname[:port]/new/path/myfile. |
| //config: |
| //config:config FEATURE_HTTPD_GZIP |
| //config: bool "Support GZIP content encoding" |
| //config: default y |
| //config: depends on HTTPD |
| //config: help |
| //config: Makes httpd send files using GZIP content encoding if the |
| //config: client supports it and a pre-compressed <file>.gz exists. |
| |
| //applet:IF_HTTPD(APPLET(httpd, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_HTTPD) += httpd.o |
| |
| //usage:#define httpd_trivial_usage |
| //usage: "[-ifv[v]]" |
| //usage: " [-c CONFFILE]" |
| //usage: " [-p [IP:]PORT]" |
| //usage: IF_FEATURE_HTTPD_SETUID(" [-u USER[:GRP]]") |
| //usage: IF_FEATURE_HTTPD_BASIC_AUTH(" [-r REALM]") |
| //usage: " [-h HOME]\n" |
| //usage: "or httpd -d/-e" IF_FEATURE_HTTPD_AUTH_MD5("/-m") " STRING" |
| //usage:#define httpd_full_usage "\n\n" |
| //usage: "Listen for incoming HTTP requests\n" |
| //usage: "\n -i Inetd mode" |
| //usage: "\n -f Don't daemonize" |
| //usage: "\n -v[v] Verbose" |
| //usage: "\n -p [IP:]PORT Bind to IP:PORT (default *:80)" |
| //usage: IF_FEATURE_HTTPD_SETUID( |
| //usage: "\n -u USER[:GRP] Set uid/gid after binding to port") |
| //usage: IF_FEATURE_HTTPD_BASIC_AUTH( |
| //usage: "\n -r REALM Authentication Realm for Basic Authentication") |
| //usage: "\n -h HOME Home directory (default .)" |
| //usage: "\n -c FILE Configuration file (default {/etc,HOME}/httpd.conf)" |
| //usage: IF_FEATURE_HTTPD_AUTH_MD5( |
| //usage: "\n -m STRING MD5 crypt STRING") |
| //usage: "\n -e STRING HTML encode STRING" |
| //usage: "\n -d STRING URL decode STRING" |
| |
| /* TODO: use TCP_CORK, parse_config() */ |
| |
| #include "libbb.h" |
| #include "common_bufsiz.h" |
| #if ENABLE_PAM |
| /* PAM may include <locale.h>. We may need to undefine bbox's stub define: */ |
| # undef setlocale |
| /* For some obscure reason, PAM is not in pam/xxx, but in security/xxx. |
| * Apparently they like to confuse people. */ |
| # include <security/pam_appl.h> |
| # include <security/pam_misc.h> |
| #endif |
| #if ENABLE_FEATURE_USE_SENDFILE |
| # include <sys/sendfile.h> |
| #endif |
| |
| #define DEBUG 0 |
| |
| #define IOBUF_SIZE 8192 |
| #define MAX_HTTP_HEADERS_SIZE (32*1024) |
| |
| #define HEADER_READ_TIMEOUT 60 |
| |
| static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc"; |
| static const char HTTPD_CONF[] ALIGN1 = "httpd.conf"; |
| static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n"; |
| static const char index_html[] ALIGN1 = "index.html"; |
| |
| typedef struct has_next_ptr { |
| struct has_next_ptr *next; |
| } has_next_ptr; |
| |
| /* Must have "next" as a first member */ |
| typedef struct Htaccess { |
| struct Htaccess *next; |
| char *after_colon; |
| char before_colon[1]; /* really bigger, must be last */ |
| } Htaccess; |
| |
| /* Must have "next" as a first member */ |
| typedef struct Htaccess_IP { |
| struct Htaccess_IP *next; |
| unsigned ip; |
| unsigned mask; |
| int allow_deny; |
| } Htaccess_IP; |
| |
| /* Must have "next" as a first member */ |
| typedef struct Htaccess_Proxy { |
| struct Htaccess_Proxy *next; |
| char *url_from; |
| char *host_port; |
| char *url_to; |
| } Htaccess_Proxy; |
| |
| typedef enum CGI_type { |
| CGI_NONE = 0, |
| CGI_NORMAL, |
| CGI_INDEX, |
| CGI_INTERPRETER, |
| } CGI_type; |
| |
| enum { |
| HTTP_OK = 200, |
| HTTP_PARTIAL_CONTENT = 206, |
| HTTP_MOVED_TEMPORARILY = 302, |
| HTTP_BAD_REQUEST = 400, /* malformed syntax */ |
| HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */ |
| HTTP_NOT_FOUND = 404, |
| HTTP_FORBIDDEN = 403, |
| HTTP_REQUEST_TIMEOUT = 408, |
| HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */ |
| HTTP_INTERNAL_SERVER_ERROR = 500, |
| HTTP_ENTITY_TOO_LARGE = 413, |
| HTTP_CONTINUE = 100, |
| #if 0 /* future use */ |
| HTTP_SWITCHING_PROTOCOLS = 101, |
| HTTP_CREATED = 201, |
| HTTP_ACCEPTED = 202, |
| HTTP_NON_AUTHORITATIVE_INFO = 203, |
| HTTP_NO_CONTENT = 204, |
| HTTP_MULTIPLE_CHOICES = 300, |
| HTTP_MOVED_PERMANENTLY = 301, |
| HTTP_NOT_MODIFIED = 304, |
| HTTP_PAYMENT_REQUIRED = 402, |
| HTTP_BAD_GATEWAY = 502, |
| HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */ |
| #endif |
| }; |
| |
| static const uint16_t http_response_type[] ALIGN2 = { |
| HTTP_OK, |
| #if ENABLE_FEATURE_HTTPD_RANGES |
| HTTP_PARTIAL_CONTENT, |
| #endif |
| HTTP_MOVED_TEMPORARILY, |
| HTTP_REQUEST_TIMEOUT, |
| HTTP_NOT_IMPLEMENTED, |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| HTTP_UNAUTHORIZED, |
| #endif |
| HTTP_NOT_FOUND, |
| HTTP_BAD_REQUEST, |
| HTTP_FORBIDDEN, |
| HTTP_INTERNAL_SERVER_ERROR, |
| HTTP_ENTITY_TOO_LARGE, |
| #if 0 /* not implemented */ |
| HTTP_CREATED, |
| HTTP_ACCEPTED, |
| HTTP_NO_CONTENT, |
| HTTP_MULTIPLE_CHOICES, |
| HTTP_MOVED_PERMANENTLY, |
| HTTP_NOT_MODIFIED, |
| HTTP_BAD_GATEWAY, |
| HTTP_SERVICE_UNAVAILABLE, |
| #endif |
| }; |
| |
| static const struct { |
| const char *name; |
| const char *info; |
| } http_response[ARRAY_SIZE(http_response_type)] = { |
| { "OK", NULL }, |
| #if ENABLE_FEATURE_HTTPD_RANGES |
| { "Partial Content", NULL }, |
| #endif |
| { "Found", NULL }, |
| { "Request Timeout", "No request appeared within 60 seconds" }, |
| { "Not Implemented", "The requested method is not recognized" }, |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| { "Unauthorized", "" }, |
| #endif |
| { "Not Found", "The requested URL was not found" }, |
| { "Bad Request", "Unsupported method" }, |
| { "Forbidden", "" }, |
| { "Internal Server Error", "Internal Server Error" }, |
| { "Entity Too Large", "Entity Too Large" }, |
| #if 0 /* not implemented */ |
| { "Created" }, |
| { "Accepted" }, |
| { "No Content" }, |
| { "Multiple Choices" }, |
| { "Moved Permanently" }, |
| { "Not Modified" }, |
| { "Bad Gateway", "" }, |
| { "Service Unavailable", "" }, |
| #endif |
| }; |
| |
| struct globals { |
| int verbose; /* must be int (used by getopt32) */ |
| smallint flg_deny_all; |
| #if ENABLE_FEATURE_HTTPD_GZIP |
| /* client can handle gzip / we are going to send gzip */ |
| smallint content_gzip; |
| #endif |
| time_t last_mod; |
| char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */ |
| const char *bind_addr_or_port; |
| |
| char *g_query; |
| const char *opt_c_configFile; |
| const char *home_httpd; |
| const char *index_page; |
| |
| const char *found_mime_type; |
| const char *found_moved_temporarily; |
| Htaccess_IP *ip_a_d; /* config allow/deny lines */ |
| |
| IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;) |
| IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;) |
| |
| off_t file_size; /* -1 - unknown */ |
| #if ENABLE_FEATURE_HTTPD_RANGES |
| off_t range_start; |
| off_t range_end; |
| off_t range_len; |
| #endif |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| Htaccess *g_auth; /* config user:password lines */ |
| #endif |
| Htaccess *mime_a; /* config mime types */ |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| Htaccess *script_i; /* config script interpreters */ |
| #endif |
| char *iobuf; /* [IOBUF_SIZE] */ |
| #define hdr_buf bb_common_bufsiz1 |
| #define sizeof_hdr_buf COMMON_BUFSIZE |
| char *hdr_ptr; |
| int hdr_cnt; |
| #if ENABLE_FEATURE_HTTPD_ERROR_PAGES |
| const char *http_error_page[ARRAY_SIZE(http_response_type)]; |
| #endif |
| #if ENABLE_FEATURE_HTTPD_PROXY |
| Htaccess_Proxy *proxy; |
| #endif |
| }; |
| #define G (*ptr_to_globals) |
| #define verbose (G.verbose ) |
| #define flg_deny_all (G.flg_deny_all ) |
| #if ENABLE_FEATURE_HTTPD_GZIP |
| # define content_gzip (G.content_gzip ) |
| #else |
| # define content_gzip 0 |
| #endif |
| #define bind_addr_or_port (G.bind_addr_or_port) |
| #define g_query (G.g_query ) |
| #define opt_c_configFile (G.opt_c_configFile ) |
| #define home_httpd (G.home_httpd ) |
| #define index_page (G.index_page ) |
| #define found_mime_type (G.found_mime_type ) |
| #define found_moved_temporarily (G.found_moved_temporarily) |
| #define last_mod (G.last_mod ) |
| #define ip_a_d (G.ip_a_d ) |
| #define g_realm (G.g_realm ) |
| #define remoteuser (G.remoteuser ) |
| #define file_size (G.file_size ) |
| #if ENABLE_FEATURE_HTTPD_RANGES |
| #define range_start (G.range_start ) |
| #define range_end (G.range_end ) |
| #define range_len (G.range_len ) |
| #else |
| enum { |
| range_start = -1, |
| range_end = MAXINT(off_t) - 1, |
| range_len = MAXINT(off_t), |
| }; |
| #endif |
| #define rmt_ip_str (G.rmt_ip_str ) |
| #define g_auth (G.g_auth ) |
| #define mime_a (G.mime_a ) |
| #define script_i (G.script_i ) |
| #define iobuf (G.iobuf ) |
| #define hdr_ptr (G.hdr_ptr ) |
| #define hdr_cnt (G.hdr_cnt ) |
| #define http_error_page (G.http_error_page ) |
| #define proxy (G.proxy ) |
| #define INIT_G() do { \ |
| setup_common_bufsiz(); \ |
| SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
| IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \ |
| IF_FEATURE_HTTPD_RANGES(range_start = -1;) \ |
| bind_addr_or_port = "80"; \ |
| index_page = index_html; \ |
| file_size = -1; \ |
| } while (0) |
| |
| |
| #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1) |
| |
| /* Prototypes */ |
| enum { |
| SEND_HEADERS = (1 << 0), |
| SEND_BODY = (1 << 1), |
| SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY, |
| }; |
| static void send_file_and_exit(const char *url, int what) NORETURN; |
| |
| static void free_llist(has_next_ptr **pptr) |
| { |
| has_next_ptr *cur = *pptr; |
| while (cur) { |
| has_next_ptr *t = cur; |
| cur = cur->next; |
| free(t); |
| } |
| *pptr = NULL; |
| } |
| |
| static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr) |
| { |
| free_llist((has_next_ptr**)pptr); |
| } |
| |
| static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr) |
| { |
| free_llist((has_next_ptr**)pptr); |
| } |
| |
| /* Returns presumed mask width in bits or < 0 on error. |
| * Updates strp, stores IP at provided pointer */ |
| static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc) |
| { |
| const char *p = *strp; |
| int auto_mask = 8; |
| unsigned ip = 0; |
| int j; |
| |
| if (*p == '/') |
| return -auto_mask; |
| |
| for (j = 0; j < 4; j++) { |
| unsigned octet; |
| |
| if ((*p < '0' || *p > '9') && *p != '/' && *p) |
| return -auto_mask; |
| octet = 0; |
| while (*p >= '0' && *p <= '9') { |
| octet *= 10; |
| octet += *p - '0'; |
| if (octet > 255) |
| return -auto_mask; |
| p++; |
| } |
| if (*p == '.') |
| p++; |
| if (*p != '/' && *p) |
| auto_mask += 8; |
| ip = (ip << 8) | octet; |
| } |
| if (*p) { |
| if (*p != endc) |
| return -auto_mask; |
| p++; |
| if (*p == '\0') |
| return -auto_mask; |
| } |
| *ipp = ip; |
| *strp = p; |
| return auto_mask; |
| } |
| |
| /* Returns 0 on success. Stores IP and mask at provided pointers */ |
| static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp) |
| { |
| int i; |
| unsigned mask; |
| char *p; |
| |
| i = scan_ip(&str, ipp, '/'); |
| if (i < 0) |
| return i; |
| |
| if (*str) { |
| /* there is /xxx after dotted-IP address */ |
| i = bb_strtou(str, &p, 10); |
| if (*p == '.') { |
| /* 'xxx' itself is dotted-IP mask, parse it */ |
| /* (return 0 (success) only if it has N.N.N.N form) */ |
| return scan_ip(&str, maskp, '\0') - 32; |
| } |
| if (*p) |
| return -1; |
| } |
| |
| if (i > 32) |
| return -1; |
| |
| if (sizeof(unsigned) == 4 && i == 32) { |
| /* mask >>= 32 below may not work */ |
| mask = 0; |
| } else { |
| mask = 0xffffffff; |
| mask >>= i; |
| } |
| /* i == 0 -> *maskp = 0x00000000 |
| * i == 1 -> *maskp = 0x80000000 |
| * i == 4 -> *maskp = 0xf0000000 |
| * i == 31 -> *maskp = 0xfffffffe |
| * i == 32 -> *maskp = 0xffffffff */ |
| *maskp = (uint32_t)(~mask); |
| return 0; |
| } |
| |
| /* |
| * Parse configuration file into in-memory linked list. |
| * |
| * Any previous IP rules are discarded. |
| * If the flag argument is not SUBDIR_PARSE then all /path and mime rules |
| * are also discarded. That is, previous settings are retained if flag is |
| * SUBDIR_PARSE. |
| * Error pages are only parsed on the main config file. |
| * |
| * path Path where to look for httpd.conf (without filename). |
| * flag Type of the parse request. |
| */ |
| /* flag param: */ |
| enum { |
| FIRST_PARSE = 0, /* path will be "/etc" */ |
| SIGNALED_PARSE = 1, /* path will be "/etc" */ |
| SUBDIR_PARSE = 2, /* path will be derived from URL */ |
| }; |
| static void parse_conf(const char *path, int flag) |
| { |
| /* internally used extra flag state */ |
| enum { TRY_CURDIR_PARSE = 3 }; |
| |
| FILE *f; |
| const char *filename; |
| char buf[160]; |
| |
| /* discard old rules */ |
| free_Htaccess_IP_list(&ip_a_d); |
| flg_deny_all = 0; |
| /* retain previous auth and mime config only for subdir parse */ |
| if (flag != SUBDIR_PARSE) { |
| free_Htaccess_list(&mime_a); |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| free_Htaccess_list(&g_auth); |
| #endif |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| free_Htaccess_list(&script_i); |
| #endif |
| } |
| |
| filename = opt_c_configFile; |
| if (flag == SUBDIR_PARSE || filename == NULL) { |
| filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2); |
| sprintf((char *)filename, "%s/%s", path, HTTPD_CONF); |
| } |
| |
| while ((f = fopen_for_read(filename)) == NULL) { |
| if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */ |
| /* config file not found, no changes to config */ |
| return; |
| } |
| if (flag == FIRST_PARSE) { |
| /* -c CONFFILE given, but CONFFILE doesn't exist? */ |
| if (opt_c_configFile) |
| bb_simple_perror_msg_and_die(opt_c_configFile); |
| /* else: no -c, thus we looked at /etc/httpd.conf, |
| * and it's not there. try ./httpd.conf: */ |
| } |
| flag = TRY_CURDIR_PARSE; |
| filename = HTTPD_CONF; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| /* in "/file:user:pass" lines, we prepend path in subdirs */ |
| if (flag != SUBDIR_PARSE) |
| path = ""; |
| #endif |
| /* The lines can be: |
| * |
| * I:default_index_file |
| * H:http_home |
| * [AD]:IP[/mask] # allow/deny, * for wildcard |
| * Ennn:error.html # error page for status nnn |
| * P:/url:[http://]hostname[:port]/new/path # reverse proxy |
| * .ext:mime/type # mime type |
| * *.php:/path/php # run xxx.php through an interpreter |
| * /file:user:pass # username and password |
| */ |
| while (fgets(buf, sizeof(buf), f) != NULL) { |
| unsigned strlen_buf; |
| unsigned char ch; |
| char *after_colon; |
| |
| { /* remove all whitespace, and # comments */ |
| char *p, *p0; |
| |
| p0 = buf; |
| /* skip non-whitespace beginning. Often the whole line |
| * is non-whitespace. We want this case to work fast, |
| * without needless copying, therefore we don't merge |
| * this operation into next while loop. */ |
| while ((ch = *p0) != '\0' && ch != '\n' && ch != '#' |
| && ch != ' ' && ch != '\t' |
| ) { |
| p0++; |
| } |
| p = p0; |
| /* if we enter this loop, we have some whitespace. |
| * discard it */ |
| while (ch != '\0' && ch != '\n' && ch != '#') { |
| if (ch != ' ' && ch != '\t') { |
| *p++ = ch; |
| } |
| ch = *++p0; |
| } |
| *p = '\0'; |
| strlen_buf = p - buf; |
| if (strlen_buf == 0) |
| continue; /* empty line */ |
| } |
| |
| after_colon = strchr(buf, ':'); |
| /* strange line? */ |
| if (after_colon == NULL || *++after_colon == '\0') |
| goto config_error; |
| |
| ch = (buf[0] & ~0x20); /* toupper if it's a letter */ |
| |
| if (ch == 'I') { |
| if (index_page != index_html) |
| free((char*)index_page); |
| index_page = xstrdup(after_colon); |
| continue; |
| } |
| |
| /* do not allow jumping around using H in subdir's configs */ |
| if (flag == FIRST_PARSE && ch == 'H') { |
| home_httpd = xstrdup(after_colon); |
| xchdir(home_httpd); |
| continue; |
| } |
| |
| if (ch == 'A' || ch == 'D') { |
| Htaccess_IP *pip; |
| |
| if (*after_colon == '*') { |
| if (ch == 'D') { |
| /* memorize "deny all" */ |
| flg_deny_all = 1; |
| } |
| /* skip assumed "A:*", it is a default anyway */ |
| continue; |
| } |
| /* store "allow/deny IP/mask" line */ |
| pip = xzalloc(sizeof(*pip)); |
| if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) { |
| /* IP{/mask} syntax error detected, protect all */ |
| ch = 'D'; |
| pip->mask = 0; |
| } |
| pip->allow_deny = ch; |
| if (ch == 'D') { |
| /* Deny:from_IP - prepend */ |
| pip->next = ip_a_d; |
| ip_a_d = pip; |
| } else { |
| /* A:from_IP - append (thus all D's precedes A's) */ |
| Htaccess_IP *prev_IP = ip_a_d; |
| if (prev_IP == NULL) { |
| ip_a_d = pip; |
| } else { |
| while (prev_IP->next) |
| prev_IP = prev_IP->next; |
| prev_IP->next = pip; |
| } |
| } |
| continue; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_ERROR_PAGES |
| if (flag == FIRST_PARSE && ch == 'E') { |
| unsigned i; |
| int status = atoi(buf + 1); /* error status code */ |
| |
| if (status < HTTP_CONTINUE) { |
| goto config_error; |
| } |
| /* then error page; find matching status */ |
| for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { |
| if (http_response_type[i] == status) { |
| /* We chdir to home_httpd, thus no need to |
| * concat_path_file(home_httpd, after_colon) |
| * here */ |
| http_error_page[i] = xstrdup(after_colon); |
| break; |
| } |
| } |
| continue; |
| } |
| #endif |
| |
| #if ENABLE_FEATURE_HTTPD_PROXY |
| if (flag == FIRST_PARSE && ch == 'P') { |
| /* P:/url:[http://]hostname[:port]/new/path */ |
| char *url_from, *host_port, *url_to; |
| Htaccess_Proxy *proxy_entry; |
| |
| url_from = after_colon; |
| host_port = strchr(after_colon, ':'); |
| if (host_port == NULL) { |
| goto config_error; |
| } |
| *host_port++ = '\0'; |
| if (is_prefixed_with(host_port, "http://")) |
| host_port += 7; |
| if (*host_port == '\0') { |
| goto config_error; |
| } |
| url_to = strchr(host_port, '/'); |
| if (url_to == NULL) { |
| goto config_error; |
| } |
| *url_to = '\0'; |
| proxy_entry = xzalloc(sizeof(*proxy_entry)); |
| proxy_entry->url_from = xstrdup(url_from); |
| proxy_entry->host_port = xstrdup(host_port); |
| *url_to = '/'; |
| proxy_entry->url_to = xstrdup(url_to); |
| proxy_entry->next = proxy; |
| proxy = proxy_entry; |
| continue; |
| } |
| #endif |
| /* the rest of directives are non-alphabetic, |
| * must avoid using "toupper'ed" ch */ |
| ch = buf[0]; |
| |
| if (ch == '.' /* ".ext:mime/type" */ |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */ |
| #endif |
| ) { |
| char *p; |
| Htaccess *cur; |
| |
| cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf); |
| strcpy(cur->before_colon, buf); |
| p = cur->before_colon + (after_colon - buf); |
| p[-1] = '\0'; |
| cur->after_colon = p; |
| if (ch == '.') { |
| /* .mime line: prepend to mime_a list */ |
| cur->next = mime_a; |
| mime_a = cur; |
| } |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| else { |
| /* script interpreter line: prepend to script_i list */ |
| cur->next = script_i; |
| script_i = cur; |
| } |
| #endif |
| continue; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (ch == '/') { /* "/file:user:pass" */ |
| char *p; |
| Htaccess *cur; |
| unsigned file_len; |
| |
| /* note: path is "" unless we are in SUBDIR parse, |
| * otherwise it does NOT start with "/" */ |
| cur = xzalloc(sizeof(*cur) /* includes space for NUL */ |
| + 1 + strlen(path) |
| + strlen_buf |
| ); |
| /* form "/path/file" */ |
| sprintf(cur->before_colon, "/%s%.*s", |
| path, |
| (int) (after_colon - buf - 1), /* includes "/", but not ":" */ |
| buf); |
| /* canonicalize it */ |
| p = bb_simplify_abs_path_inplace(cur->before_colon); |
| file_len = p - cur->before_colon; |
| /* add "user:pass" after NUL */ |
| strcpy(++p, after_colon); |
| cur->after_colon = p; |
| |
| /* insert cur into g_auth */ |
| /* g_auth is sorted by decreased filename length */ |
| { |
| Htaccess *auth, **authp; |
| |
| authp = &g_auth; |
| while ((auth = *authp) != NULL) { |
| if (file_len >= strlen(auth->before_colon)) { |
| /* insert cur before auth */ |
| cur->next = auth; |
| break; |
| } |
| authp = &auth->next; |
| } |
| *authp = cur; |
| } |
| continue; |
| } |
| #endif /* BASIC_AUTH */ |
| |
| /* the line is not recognized */ |
| config_error: |
| bb_error_msg("config error '%s' in '%s'", buf, filename); |
| } /* while (fgets) */ |
| |
| fclose(f); |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR |
| /* |
| * Given a string, html-encode special characters. |
| * This is used for the -e command line option to provide an easy way |
| * for scripts to encode result data without confusing browsers. The |
| * returned string pointer is memory allocated by malloc(). |
| * |
| * Returns a pointer to the encoded string (malloced). |
| */ |
| static char *encodeString(const char *string) |
| { |
| /* take the simple route and encode everything */ |
| /* could possibly scan once to get length. */ |
| int len = strlen(string); |
| char *out = xmalloc(len * 6 + 1); |
| char *p = out; |
| char ch; |
| |
| while ((ch = *string++) != '\0') { |
| /* very simple check for what to encode */ |
| if (isalnum(ch)) |
| *p++ = ch; |
| else |
| p += sprintf(p, "&#%u;", (unsigned char) ch); |
| } |
| *p = '\0'; |
| return out; |
| } |
| #endif |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| /* |
| * Decode a base64 data stream as per rfc1521. |
| * Note that the rfc states that non base64 chars are to be ignored. |
| * Since the decode always results in a shorter size than the input, |
| * it is OK to pass the input arg as an output arg. |
| * Parameter: a pointer to a base64 encoded string. |
| * Decoded data is stored in-place. |
| */ |
| static void decodeBase64(char *Data) |
| { |
| const unsigned char *in = (const unsigned char *)Data; |
| /* The decoded size will be at most 3/4 the size of the encoded */ |
| unsigned ch = 0; |
| int i = 0; |
| |
| while (*in) { |
| int t = *in++; |
| |
| if (t >= '0' && t <= '9') |
| t = t - '0' + 52; |
| else if (t >= 'A' && t <= 'Z') |
| t = t - 'A'; |
| else if (t >= 'a' && t <= 'z') |
| t = t - 'a' + 26; |
| else if (t == '+') |
| t = 62; |
| else if (t == '/') |
| t = 63; |
| else if (t == '=') |
| t = 0; |
| else |
| continue; |
| |
| ch = (ch << 6) | t; |
| i++; |
| if (i == 4) { |
| *Data++ = (char) (ch >> 16); |
| *Data++ = (char) (ch >> 8); |
| *Data++ = (char) ch; |
| i = 0; |
| } |
| } |
| *Data = '\0'; |
| } |
| #endif |
| |
| /* |
| * Create a listen server socket on the designated port. |
| */ |
| static int openServer(void) |
| { |
| unsigned n = bb_strtou(bind_addr_or_port, NULL, 10); |
| if (!errno && n && n <= 0xffff) |
| n = create_and_bind_stream_or_die(NULL, n); |
| else |
| n = create_and_bind_stream_or_die(bind_addr_or_port, 80); |
| xlisten(n, 9); |
| return n; |
| } |
| |
| /* |
| * Log the connection closure and exit. |
| */ |
| static void log_and_exit(void) NORETURN; |
| static void log_and_exit(void) |
| { |
| /* Paranoia. IE said to be buggy. It may send some extra data |
| * or be confused by us just exiting without SHUT_WR. Oh well. */ |
| shutdown(1, SHUT_WR); |
| /* Why?? |
| (this also messes up stdin when user runs httpd -i from terminal) |
| ndelay_on(0); |
| while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0) |
| continue; |
| */ |
| |
| if (verbose > 2) |
| bb_simple_error_msg("closed"); |
| _exit(xfunc_error_retval); |
| } |
| |
| /* |
| * Create and send HTTP response headers. |
| * The arguments are combined and sent as one write operation. Note that |
| * IE will puke big-time if the headers are not sent in one packet and the |
| * second packet is delayed for any reason. |
| * responseNum - the result code to send. |
| */ |
| static void send_headers(unsigned responseNum) |
| { |
| static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT"; |
| /* Fixed size 29-byte string. Example: Sun, 06 Nov 1994 08:49:37 GMT */ |
| char date_str[40]; /* using a bit larger buffer to paranoia reasons */ |
| |
| struct tm tm; |
| const char *responseString = ""; |
| const char *infoString = NULL; |
| #if ENABLE_FEATURE_HTTPD_ERROR_PAGES |
| const char *error_page = NULL; |
| #endif |
| unsigned len; |
| unsigned i; |
| time_t timer = time(NULL); |
| |
| for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { |
| if (http_response_type[i] == responseNum) { |
| responseString = http_response[i].name; |
| infoString = http_response[i].info; |
| #if ENABLE_FEATURE_HTTPD_ERROR_PAGES |
| error_page = http_error_page[i]; |
| #endif |
| break; |
| } |
| } |
| |
| if (verbose) |
| bb_error_msg("response:%u", responseNum); |
| |
| /* We use sprintf, not snprintf (it's less code). |
| * iobuf[] is several kbytes long and all headers we generate |
| * always fit into those kbytes. |
| */ |
| |
| strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime_r(&timer, &tm)); |
| /* ^^^ using gmtime_r() instead of gmtime() to not use static data */ |
| len = sprintf(iobuf, |
| "HTTP/1.0 %u %s\r\n" |
| "Date: %s\r\n" |
| "Connection: close\r\n", |
| responseNum, responseString, |
| date_str |
| ); |
| |
| if (responseNum != HTTP_OK || found_mime_type) { |
| len += sprintf(iobuf + len, |
| "Content-type: %s\r\n", |
| /* if it's error message, then it's HTML */ |
| (responseNum != HTTP_OK ? "text/html" : found_mime_type) |
| ); |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (responseNum == HTTP_UNAUTHORIZED) { |
| len += sprintf(iobuf + len, |
| "WWW-Authenticate: Basic realm=\"%.999s\"\r\n", |
| g_realm /* %.999s protects from overflowing iobuf[] */ |
| ); |
| } |
| #endif |
| if (responseNum == HTTP_MOVED_TEMPORARILY) { |
| /* Responding to "GET /dir" with |
| * "HTTP/1.0 302 Found" "Location: /dir/" |
| * - IOW, asking them to repeat with a slash. |
| * Here, overflow IS possible, can't use sprintf: |
| * mkdir test |
| * python -c 'print("get /test?" + ("x" * 8192))' | busybox httpd -i -h . |
| */ |
| len += snprintf(iobuf + len, IOBUF_SIZE-3 - len, |
| "Location: %s/%s%s\r\n", |
| found_moved_temporarily, |
| (g_query ? "?" : ""), |
| (g_query ? g_query : "") |
| ); |
| if (len > IOBUF_SIZE-3) |
| len = IOBUF_SIZE-3; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_ERROR_PAGES |
| if (error_page && access(error_page, R_OK) == 0) { |
| iobuf[len++] = '\r'; |
| iobuf[len++] = '\n'; |
| if (DEBUG) { |
| iobuf[len] = '\0'; |
| fprintf(stderr, "headers: '%s'\n", iobuf); |
| } |
| full_write(STDOUT_FILENO, iobuf, len); |
| if (DEBUG) |
| fprintf(stderr, "writing error page: '%s'\n", error_page); |
| return send_file_and_exit(error_page, SEND_BODY); |
| } |
| #endif |
| |
| if (file_size != -1) { /* file */ |
| strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime_r(&last_mod, &tm)); |
| #if ENABLE_FEATURE_HTTPD_RANGES |
| if (responseNum == HTTP_PARTIAL_CONTENT) { |
| len += sprintf(iobuf + len, |
| "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n", |
| range_start, |
| range_end, |
| file_size |
| ); |
| file_size = range_end - range_start + 1; |
| } |
| #endif |
| |
| //RFC 2616 4.4 Message Length |
| // The transfer-length of a message is the length of the message-body as |
| // it appears in the message; that is, after any transfer-codings have |
| // been applied. When a message-body is included with a message, the |
| // transfer-length of that body is determined by one of the following |
| // (in order of precedence): |
| // 1.Any response message which "MUST NOT" include a message-body (such |
| // as the 1xx, 204, and 304 responses and any response to a HEAD |
| // request) is always terminated by the first empty line after the |
| // header fields, regardless of the entity-header fields present in |
| // the message. |
| // 2.If a Transfer-Encoding header field (section 14.41) is present and |
| // has any value other than "identity", then the transfer-length is |
| // defined by use of the "chunked" transfer-coding (section 3.6), |
| // unless the message is terminated by closing the connection. |
| // 3.If a Content-Length header field (section 14.13) is present, its |
| // decimal value in OCTETs represents both the entity-length and the |
| // transfer-length. The Content-Length header field MUST NOT be sent |
| // if these two lengths are different (i.e., if a Transfer-Encoding |
| // header field is present). If a message is received with both a |
| // Transfer-Encoding header field and a Content-Length header field, |
| // the latter MUST be ignored. |
| // 4.If the message uses the media type "multipart/byteranges" ... |
| // 5.By the server closing the connection. |
| // |
| // (NB: standards do not define "Transfer-Length:" _header_, |
| // transfer-length above is just a concept). |
| |
| len += sprintf(iobuf + len, |
| #if ENABLE_FEATURE_HTTPD_RANGES |
| "Accept-Ranges: bytes\r\n" |
| #endif |
| "Last-Modified: %s\r\n" |
| /* Because of 4.4 (5), we can forgo sending of "Content-Length" |
| * since we close connection afterwards, but it helps clients |
| * to e.g. estimate download times, show progress bars etc. |
| * Theoretically we should not send it if page is compressed, |
| * but de-facto standard is to send it (see comment below). |
| */ |
| "Content-Length: %"OFF_FMT"u\r\n", |
| date_str, |
| file_size |
| ); |
| } |
| |
| /* This should be "Transfer-Encoding", not "Content-Encoding": |
| * "data is compressed for transfer", not "data is an archive". |
| * But many clients were not handling "Transfer-Encoding" correctly |
| * (they were not uncompressing gzipped pages, tried to show |
| * raw compressed data), and servers worked around it by using |
| * "Content-Encoding" instead... and this become de-facto standard. |
| * https://bugzilla.mozilla.org/show_bug.cgi?id=68517 |
| * https://bugs.chromium.org/p/chromium/issues/detail?id=94730 |
| */ |
| if (content_gzip) |
| len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n"); |
| |
| iobuf[len++] = '\r'; |
| iobuf[len++] = '\n'; |
| if (infoString) { |
| len += sprintf(iobuf + len, |
| "<HTML><HEAD><TITLE>%u %s</TITLE></HEAD>\n" |
| "<BODY><H1>%u %s</H1>\n" |
| "%s\n" |
| "</BODY></HTML>\n", |
| responseNum, responseString, |
| responseNum, responseString, |
| infoString |
| ); |
| } |
| if (DEBUG) { |
| iobuf[len] = '\0'; |
| fprintf(stderr, "headers: '%s'\n", iobuf); |
| } |
| if (full_write(STDOUT_FILENO, iobuf, len) != len) { |
| if (verbose > 1) |
| bb_simple_perror_msg("error"); |
| log_and_exit(); |
| } |
| } |
| |
| static void send_headers_and_exit(int responseNum) NORETURN; |
| static void send_headers_and_exit(int responseNum) |
| { |
| IF_FEATURE_HTTPD_GZIP(content_gzip = 0;) |
| send_headers(responseNum); |
| log_and_exit(); |
| } |
| |
| /* |
| * Read from the socket until '\n' or EOF. |
| * '\r' chars are removed. |
| * '\n' is replaced with NUL. |
| * Return number of characters read or 0 if nothing is read |
| * ('\r' and '\n' are not counted). |
| * Data is returned in iobuf. |
| */ |
| static unsigned get_line(void) |
| { |
| unsigned count; |
| char c; |
| |
| count = 0; |
| while (1) { |
| if (hdr_cnt <= 0) { |
| alarm(HEADER_READ_TIMEOUT); |
| hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf); |
| if (hdr_cnt <= 0) |
| goto ret; |
| hdr_ptr = hdr_buf; |
| } |
| hdr_cnt--; |
| c = *hdr_ptr++; |
| if (c == '\r') |
| continue; |
| if (c == '\n') |
| break; |
| iobuf[count] = c; |
| if (count < (IOBUF_SIZE - 1)) /* check overflow */ |
| count++; |
| } |
| ret: |
| iobuf[count] = '\0'; |
| return count; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY |
| |
| /* gcc 4.2.1 fares better with NOINLINE */ |
| static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN; |
| static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) |
| { |
| enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */ |
| struct pollfd pfd[3]; |
| int out_cnt; /* we buffer a bit of initial CGI output */ |
| int count; |
| |
| /* iobuf is used for CGI -> network data, |
| * hdr_buf is for network -> CGI data (POSTDATA) */ |
| |
| /* If CGI dies, we still want to correctly finish reading its output |
| * and send it to the peer. So please no SIGPIPEs! */ |
| signal(SIGPIPE, SIG_IGN); |
| |
| // We inconsistently handle a case when more POSTDATA from network |
| // is coming than we expected. We may give *some part* of that |
| // extra data to CGI. |
| |
| //if (hdr_cnt > post_len) { |
| // /* We got more POSTDATA from network than we expected */ |
| // hdr_cnt = post_len; |
| //} |
| post_len -= hdr_cnt; |
| /* post_len - number of POST bytes not yet read from network */ |
| |
| /* NB: breaking out of this loop jumps to log_and_exit() */ |
| out_cnt = 0; |
| pfd[FROM_CGI].fd = fromCgi_rd; |
| pfd[FROM_CGI].events = POLLIN; |
| pfd[TO_CGI].fd = toCgi_wr; |
| while (1) { |
| /* Note: even pfd[0].events == 0 won't prevent |
| * revents == POLLHUP|POLLERR reports from closed stdin. |
| * Setting fd to -1 works: */ |
| pfd[0].fd = -1; |
| pfd[0].events = POLLIN; |
| pfd[0].revents = 0; /* probably not needed, paranoia */ |
| |
| /* We always poll this fd, thus kernel always sets revents: */ |
| /*pfd[FROM_CGI].events = POLLIN; - moved out of loop */ |
| /*pfd[FROM_CGI].revents = 0; - not needed */ |
| |
| /* gcc-4.8.0 still doesnt fill two shorts with one insn :( */ |
| /* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47059 */ |
| /* hopefully one day it will... */ |
| pfd[TO_CGI].events = POLLOUT; |
| pfd[TO_CGI].revents = 0; /* needed! */ |
| |
| if (toCgi_wr && hdr_cnt <= 0) { |
| if (post_len > 0) { |
| /* Expect more POST data from network */ |
| pfd[0].fd = 0; |
| } else { |
| /* post_len <= 0 && hdr_cnt <= 0: |
| * no more POST data to CGI, |
| * let CGI see EOF on CGI's stdin */ |
| if (toCgi_wr != fromCgi_rd) |
| close(toCgi_wr); |
| toCgi_wr = 0; |
| } |
| } |
| |
| /* Now wait on the set of sockets */ |
| count = safe_poll(pfd, hdr_cnt > 0 ? TO_CGI+1 : FROM_CGI+1, -1); |
| if (count <= 0) { |
| #if 0 |
| if (safe_waitpid(pid, &status, WNOHANG) <= 0) { |
| /* Weird. CGI didn't exit and no fd's |
| * are ready, yet poll returned?! */ |
| continue; |
| } |
| if (DEBUG && WIFEXITED(status)) |
| bb_error_msg("CGI exited, status=%u", WEXITSTATUS(status)); |
| if (DEBUG && WIFSIGNALED(status)) |
| bb_error_msg("CGI killed, signal=%u", WTERMSIG(status)); |
| #endif |
| break; |
| } |
| |
| if (pfd[TO_CGI].revents) { |
| /* hdr_cnt > 0 here due to the way poll() called */ |
| /* Have data from peer and can write to CGI */ |
| count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt); |
| /* Doesn't happen, we dont use nonblocking IO here |
| *if (count < 0 && errno == EAGAIN) { |
| * ... |
| *} else */ |
| if (count > 0) { |
| hdr_ptr += count; |
| hdr_cnt -= count; |
| } else { |
| /* EOF/broken pipe to CGI, stop piping POST data */ |
| hdr_cnt = post_len = 0; |
| } |
| } |
| |
| if (pfd[0].revents) { |
| /* post_len > 0 && hdr_cnt == 0 here */ |
| /* We expect data, prev data portion is eaten by CGI |
| * and there *is* data to read from the peer |
| * (POSTDATA) */ |
| //count = post_len > (int)sizeof_hdr_buf ? (int)sizeof_hdr_buf : post_len; |
| //count = safe_read(STDIN_FILENO, hdr_buf, count); |
| count = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf); |
| if (count > 0) { |
| hdr_cnt = count; |
| hdr_ptr = hdr_buf; |
| post_len -= count; |
| } else { |
| /* no more POST data can be read */ |
| post_len = 0; |
| } |
| } |
| |
| if (pfd[FROM_CGI].revents) { |
| /* There is something to read from CGI */ |
| char *rbuf = iobuf; |
| |
| /* Are we still buffering CGI output? */ |
| if (out_cnt >= 0) { |
| /* HTTP_200[] has single "\r\n" at the end. |
| * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html, |
| * CGI scripts MUST send their own header terminated by |
| * empty line, then data. That's why we have only one |
| * <cr><lf> pair here. We will output "200 OK" line |
| * if needed, but CGI still has to provide blank line |
| * between header and body */ |
| |
| /* Must use safe_read, not full_read, because |
| * CGI may output a few first bytes and then wait |
| * for POSTDATA without closing stdout. |
| * With full_read we may wait here forever. */ |
| count = safe_read(fromCgi_rd, rbuf + out_cnt, IOBUF_SIZE - 8); |
| if (count <= 0) { |
| /* eof (or error) and there was no "HTTP", |
| * send "HTTP/1.0 200 OK\r\n", then send received data */ |
| if (out_cnt) { |
| full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1); |
| full_write(STDOUT_FILENO, rbuf, out_cnt); |
| } |
| break; /* CGI stdout is closed, exiting */ |
| } |
| out_cnt += count; |
| count = 0; |
| /* "Status" header format is: "Status: 302 Redirected\r\n" */ |
| if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) { |
| /* send "HTTP/1.0 " */ |
| if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9) |
| break; |
| /* skip "Status: " (including space, sending "HTTP/1.0 NNN" is wrong) */ |
| rbuf += 8; |
| count = out_cnt - 8; |
| out_cnt = -1; /* buffering off */ |
| } else if (out_cnt >= 4) { |
| /* Did CGI add "HTTP"? */ |
| if (memcmp(rbuf, HTTP_200, 4) != 0) { |
| /* there is no "HTTP", do it ourself */ |
| if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1) |
| break; |
| } |
| /* Commented out: |
| if (!strstr(rbuf, "ontent-")) { |
| full_write(s, "Content-type: text/plain\r\n\r\n", 28); |
| } |
| * Counter-example of valid CGI without Content-type: |
| * echo -en "HTTP/1.0 302 Found\r\n" |
| * echo -en "Location: http://www.busybox.net\r\n" |
| * echo -en "\r\n" |
| */ |
| count = out_cnt; |
| out_cnt = -1; /* buffering off */ |
| } |
| } else { |
| count = safe_read(fromCgi_rd, rbuf, IOBUF_SIZE); |
| if (count <= 0) |
| break; /* eof (or error) */ |
| } |
| if (full_write(STDOUT_FILENO, rbuf, count) != count) |
| break; |
| if (DEBUG) |
| fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf); |
| } /* if (pfd[FROM_CGI].revents) */ |
| } /* while (1) */ |
| log_and_exit(); |
| } |
| #endif |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| |
| static void setenv1(const char *name, const char *value) |
| { |
| setenv(name, value ? value : "", 1); |
| } |
| |
| /* |
| * Spawn CGI script, forward CGI's stdin/out <=> network |
| * |
| * Environment variables are set up and the script is invoked with pipes |
| * for stdin/stdout. If a POST is being done the script is fed the POST |
| * data in addition to setting the QUERY_STRING variable (for GETs or POSTs). |
| * |
| * Parameters: |
| * const char *url The requested URL (with leading /). |
| * const char *orig_uri The original URI before rewriting (if any) |
| * int post_len Length of the POST body. |
| */ |
| static void send_cgi_and_exit( |
| const char *url, |
| const char *orig_uri, |
| const char *request, |
| int post_len) NORETURN; |
| static void send_cgi_and_exit( |
| const char *url, |
| const char *orig_uri, |
| const char *request, |
| int post_len) |
| { |
| struct fd_pair fromCgi; /* CGI -> httpd pipe */ |
| struct fd_pair toCgi; /* httpd -> CGI pipe */ |
| char *script, *last_slash; |
| int pid; |
| |
| /* Make a copy. NB: caller guarantees: |
| * url[0] == '/', url[1] != '/' */ |
| url = xstrdup(url); |
| |
| /* |
| * We are mucking with environment _first_ and then vfork/exec, |
| * this allows us to use vfork safely. Parent doesn't care about |
| * these environment changes anyway. |
| */ |
| |
| /* Check for [dirs/]script.cgi/PATH_INFO */ |
| last_slash = script = (char*)url; |
| while ((script = strchr(script + 1, '/')) != NULL) { |
| int dir; |
| *script = '\0'; |
| dir = is_directory(url + 1, /*followlinks:*/ 1); |
| *script = '/'; |
| if (!dir) { |
| /* not directory, found script.cgi/PATH_INFO */ |
| break; |
| } |
| /* is directory, find next '/' */ |
| last_slash = script; |
| } |
| setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */ |
| setenv1("REQUEST_METHOD", request); |
| if (g_query) { |
| putenv(xasprintf("%s=%s?%s", "REQUEST_URI", orig_uri, g_query)); |
| } else { |
| setenv1("REQUEST_URI", orig_uri); |
| } |
| if (script != NULL) |
| *script = '\0'; /* cut off /PATH_INFO */ |
| |
| /* SCRIPT_FILENAME is required by PHP in CGI mode */ |
| if (home_httpd[0] == '/') { |
| char *fullpath = concat_path_file(home_httpd, url); |
| setenv1("SCRIPT_FILENAME", fullpath); |
| } |
| /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */ |
| setenv1("SCRIPT_NAME", url); |
| /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html: |
| * QUERY_STRING: The information which follows the ? in the URL |
| * which referenced this script. This is the query information. |
| * It should not be decoded in any fashion. This variable |
| * should always be set when there is query information, |
| * regardless of command line decoding. */ |
| /* (Older versions of bbox seem to do some decoding) */ |
| setenv1("QUERY_STRING", g_query); |
| putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER); |
| putenv((char*)"SERVER_PROTOCOL=HTTP/1.0"); |
| putenv((char*)"GATEWAY_INTERFACE=CGI/1.1"); |
| /* Having _separate_ variables for IP and port defeats |
| * the purpose of having socket abstraction. Which "port" |
| * are you using on Unix domain socket? |
| * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense. |
| * Oh well... */ |
| { |
| char *p = rmt_ip_str ? rmt_ip_str : (char*)""; |
| char *cp = strrchr(p, ':'); |
| if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']')) |
| cp = NULL; |
| if (cp) *cp = '\0'; /* delete :PORT */ |
| setenv1("REMOTE_ADDR", p); |
| if (cp) { |
| *cp = ':'; |
| #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV |
| setenv1("REMOTE_PORT", cp + 1); |
| #endif |
| } |
| } |
| if (post_len) |
| putenv(xasprintf("CONTENT_LENGTH=%u", post_len)); |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (remoteuser) { |
| setenv1("REMOTE_USER", remoteuser); |
| putenv((char*)"AUTH_TYPE=Basic"); |
| } |
| #endif |
| /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this, |
| * just run "env SERVER_NAME=xyz httpd ..." instead */ |
| |
| xpiped_pair(fromCgi); |
| xpiped_pair(toCgi); |
| |
| pid = vfork(); |
| if (pid < 0) { |
| /* TODO: log perror? */ |
| log_and_exit(); |
| } |
| |
| if (pid == 0) { |
| /* Child process */ |
| char *argv[3]; |
| |
| xfunc_error_retval = 242; |
| |
| /* NB: close _first_, then move fds! */ |
| close(toCgi.wr); |
| close(fromCgi.rd); |
| xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */ |
| xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */ |
| /* User seeing stderr output can be a security problem. |
| * If CGI really wants that, it can always do dup itself. */ |
| /* dup2(1, 2); */ |
| |
| /* Chdiring to script's dir */ |
| script = last_slash; |
| if (script != url) { /* paranoia */ |
| *script = '\0'; |
| if (chdir(url + 1) != 0) { |
| bb_perror_msg("can't change directory to '%s'", url + 1); |
| goto error_execing_cgi; |
| } |
| // not needed: *script = '/'; |
| } |
| script++; |
| |
| /* set argv[0] to name without path */ |
| argv[0] = script; |
| argv[1] = NULL; |
| |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| { |
| char *suffix = strrchr(script, '.'); |
| |
| if (suffix) { |
| Htaccess *cur; |
| for (cur = script_i; cur; cur = cur->next) { |
| if (strcmp(cur->before_colon + 1, suffix) == 0) { |
| /* found interpreter name */ |
| argv[0] = cur->after_colon; |
| argv[1] = script; |
| argv[2] = NULL; |
| break; |
| } |
| } |
| } |
| } |
| #endif |
| /* restore default signal dispositions for CGI process */ |
| bb_signals(0 |
| | (1 << SIGCHLD) |
| | (1 << SIGPIPE) |
| | (1 << SIGHUP) |
| , SIG_DFL); |
| |
| /* _NOT_ execvp. We do not search PATH. argv[0] is a filename |
| * without any dir components and will only match a file |
| * in the current directory */ |
| execv(argv[0], argv); |
| if (verbose) |
| bb_perror_msg("can't execute '%s'", argv[0]); |
| error_execing_cgi: |
| /* send to stdout |
| * (we are CGI here, our stdout is pumped to the net) */ |
| send_headers_and_exit(HTTP_NOT_FOUND); |
| } /* end child */ |
| |
| /* Parent process */ |
| |
| /* Restore variables possibly changed by child */ |
| xfunc_error_retval = 0; |
| |
| /* Pump data */ |
| close(fromCgi.wr); |
| close(toCgi.rd); |
| cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len); |
| } |
| |
| #endif /* FEATURE_HTTPD_CGI */ |
| |
| /* |
| * Send a file response to a HTTP request, and exit |
| * |
| * Parameters: |
| * const char *url The requested URL (with leading /). |
| * what What to send (headers/body/both). |
| */ |
| static NOINLINE void send_file_and_exit(const char *url, int what) |
| { |
| char *suffix; |
| int fd; |
| ssize_t count; |
| |
| if (content_gzip) { |
| /* does <url>.gz exist? Then use it instead */ |
| char *gzurl = xasprintf("%s.gz", url); |
| fd = open(gzurl, O_RDONLY); |
| free(gzurl); |
| if (fd != -1) { |
| struct stat sb; |
| fstat(fd, &sb); |
| file_size = sb.st_size; |
| last_mod = sb.st_mtime; |
| } else { |
| IF_FEATURE_HTTPD_GZIP(content_gzip = 0;) |
| fd = open(url, O_RDONLY); |
| } |
| } else { |
| fd = open(url, O_RDONLY); |
| } |
| if (fd < 0) { |
| if (DEBUG) |
| bb_perror_msg("can't open '%s'", url); |
| /* Error pages are sent by using send_file_and_exit(SEND_BODY). |
| * IOW: it is unsafe to call send_headers_and_exit |
| * if what is SEND_BODY! Can recurse! */ |
| if (what != SEND_BODY) |
| send_headers_and_exit(HTTP_NOT_FOUND); |
| log_and_exit(); |
| } |
| /* If you want to know about EPIPE below |
| * (happens if you abort downloads from local httpd): */ |
| signal(SIGPIPE, SIG_IGN); |
| |
| /* If not found, default is to not send "Content-type:" */ |
| /*found_mime_type = NULL; - already is */ |
| suffix = strrchr(url, '.'); |
| if (suffix) { |
| static const char suffixTable[] ALIGN1 = |
| /* Shorter suffix must be first: |
| * ".html.htm" will fail for ".htm" |
| */ |
| ".txt.h.c.cc.cpp\0" "text/plain\0" |
| /* .htm line must be after .h line */ |
| ".htm.html\0" "text/html\0" |
| ".jpg.jpeg\0" "image/jpeg\0" |
| ".gif\0" "image/gif\0" |
| ".png\0" "image/png\0" |
| ".svg\0" "image/svg+xml\0" |
| /* .css line must be after .c line */ |
| ".css\0" "text/css\0" |
| ".js\0" "application/javascript\0" |
| ".wav\0" "audio/wav\0" |
| ".avi\0" "video/x-msvideo\0" |
| ".qt.mov\0" "video/quicktime\0" |
| ".mpe.mpeg\0" "video/mpeg\0" |
| ".mid.midi\0" "audio/midi\0" |
| ".mp3\0" "audio/mpeg\0" |
| #if 0 /* unpopular */ |
| ".au\0" "audio/basic\0" |
| ".pac\0" "application/x-ns-proxy-autoconfig\0" |
| ".vrml.wrl\0" "model/vrml\0" |
| #endif |
| /* compiler adds another "\0" here */ |
| ; |
| Htaccess *cur; |
| |
| /* Examine built-in table */ |
| const char *table = suffixTable; |
| const char *table_next; |
| for (; *table; table = table_next) { |
| const char *try_suffix; |
| const char *mime_type; |
| mime_type = table + strlen(table) + 1; |
| table_next = mime_type + strlen(mime_type) + 1; |
| try_suffix = strstr(table, suffix); |
| if (!try_suffix) |
| continue; |
| try_suffix += strlen(suffix); |
| if (*try_suffix == '\0' || *try_suffix == '.') { |
| found_mime_type = mime_type; |
| break; |
| } |
| /* Example: strstr(table, ".av") != NULL, but it |
| * does not match ".avi" after all and we end up here. |
| * The table is arranged so that in this case we know |
| * that it can't match anything in the following lines, |
| * and we stop the search: */ |
| break; |
| } |
| /* ...then user's table */ |
| for (cur = mime_a; cur; cur = cur->next) { |
| if (strcmp(cur->before_colon, suffix) == 0) { |
| found_mime_type = cur->after_colon; |
| break; |
| } |
| } |
| } |
| |
| if (DEBUG) |
| bb_error_msg("sending file '%s' content-type: %s", |
| url, found_mime_type); |
| |
| #if ENABLE_FEATURE_HTTPD_RANGES |
| if (what == SEND_BODY /* err pages and ranges don't mix */ |
| || content_gzip /* we are sending compressed page: can't do ranges */ ///why? |
| ) { |
| range_start = -1; |
| } |
| range_len = MAXINT(off_t); |
| if (range_start >= 0) { |
| if (!range_end || range_end > file_size - 1) { |
| range_end = file_size - 1; |
| } |
| if (range_end < range_start |
| || lseek(fd, range_start, SEEK_SET) != range_start |
| ) { |
| lseek(fd, 0, SEEK_SET); |
| range_start = -1; |
| } else { |
| range_len = range_end - range_start + 1; |
| send_headers(HTTP_PARTIAL_CONTENT); |
| what = SEND_BODY; |
| } |
| } |
| #endif |
| if (what & SEND_HEADERS) |
| send_headers(HTTP_OK); |
| #if ENABLE_FEATURE_USE_SENDFILE |
| { |
| off_t offset = range_start; |
| while (1) { |
| /* sz is rounded down to 64k */ |
| ssize_t sz = MAXINT(ssize_t) - 0xffff; |
| IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;) |
| count = sendfile(STDOUT_FILENO, fd, &offset, sz); |
| if (count < 0) { |
| if (offset == range_start) |
| break; /* fall back to read/write loop */ |
| goto fin; |
| } |
| IF_FEATURE_HTTPD_RANGES(range_len -= count;) |
| if (count == 0 || range_len == 0) |
| log_and_exit(); |
| } |
| } |
| #endif |
| while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) { |
| ssize_t n; |
| IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;) |
| n = full_write(STDOUT_FILENO, iobuf, count); |
| if (count != n) |
| break; |
| IF_FEATURE_HTTPD_RANGES(range_len -= count;) |
| if (range_len == 0) |
| break; |
| } |
| if (count < 0) { |
| IF_FEATURE_USE_SENDFILE(fin:) |
| if (verbose > 1) |
| bb_simple_perror_msg("error"); |
| } |
| log_and_exit(); |
| } |
| |
| static void if_ip_denied_send_HTTP_FORBIDDEN_and_exit(unsigned remote_ip) |
| { |
| Htaccess_IP *cur; |
| |
| for (cur = ip_a_d; cur; cur = cur->next) { |
| #if DEBUG |
| fprintf(stderr, |
| "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n", |
| rmt_ip_str, |
| (unsigned char)(cur->ip >> 24), |
| (unsigned char)(cur->ip >> 16), |
| (unsigned char)(cur->ip >> 8), |
| (unsigned char)(cur->ip), |
| (unsigned char)(cur->mask >> 24), |
| (unsigned char)(cur->mask >> 16), |
| (unsigned char)(cur->mask >> 8), |
| (unsigned char)(cur->mask) |
| ); |
| #endif |
| if ((remote_ip & cur->mask) == cur->ip) { |
| if (cur->allow_deny == 'A') |
| return; |
| send_headers_and_exit(HTTP_FORBIDDEN); |
| } |
| } |
| |
| if (flg_deny_all) /* depends on whether we saw "D:*" */ |
| send_headers_and_exit(HTTP_FORBIDDEN); |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| |
| # if ENABLE_PAM |
| struct pam_userinfo { |
| const char *name; |
| const char *pw; |
| }; |
| |
| static int pam_talker(int num_msg, |
| const struct pam_message **msg, |
| struct pam_response **resp, |
| void *appdata_ptr) |
| { |
| int i; |
| struct pam_userinfo *userinfo = (struct pam_userinfo *) appdata_ptr; |
| struct pam_response *response; |
| |
| if (!resp || !msg || !userinfo) |
| return PAM_CONV_ERR; |
| |
| /* allocate memory to store response */ |
| response = xzalloc(num_msg * sizeof(*response)); |
| |
| /* copy values */ |
| for (i = 0; i < num_msg; i++) { |
| const char *s; |
| |
| switch (msg[i]->msg_style) { |
| case PAM_PROMPT_ECHO_ON: |
| s = userinfo->name; |
| break; |
| case PAM_PROMPT_ECHO_OFF: |
| s = userinfo->pw; |
| break; |
| case PAM_ERROR_MSG: |
| case PAM_TEXT_INFO: |
| s = ""; |
| break; |
| default: |
| free(response); |
| return PAM_CONV_ERR; |
| } |
| response[i].resp = xstrdup(s); |
| if (PAM_SUCCESS != 0) |
| response[i].resp_retcode = PAM_SUCCESS; |
| } |
| *resp = response; |
| return PAM_SUCCESS; |
| } |
| # endif |
| |
| /* |
| * Config file entries are of the form "/<path>:<user>:<passwd>". |
| * If config file has no prefix match for path, access is allowed. |
| * |
| * path The file path |
| * user_and_passwd "user:passwd" to validate |
| * |
| * Returns 1 if user_and_passwd is OK. |
| */ |
| static int check_user_passwd(const char *path, char *user_and_passwd) |
| { |
| Htaccess *cur; |
| const char *prev = NULL; |
| |
| for (cur = g_auth; cur; cur = cur->next) { |
| const char *dir_prefix; |
| size_t len; |
| int r; |
| |
| dir_prefix = cur->before_colon; |
| |
| /* WHY? */ |
| /* If already saw a match, don't accept other different matches */ |
| if (prev && strcmp(prev, dir_prefix) != 0) |
| continue; |
| |
| if (DEBUG) |
| fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd); |
| |
| /* If it's not a prefix match, continue searching */ |
| len = strlen(dir_prefix); |
| if (len != 1 /* dir_prefix "/" matches all, don't need to check */ |
| && (strncmp(dir_prefix, path, len) != 0 |
| || (path[len] != '/' && path[len] != '\0') |
| ) |
| ) { |
| continue; |
| } |
| |
| /* Path match found */ |
| prev = dir_prefix; |
| |
| if (ENABLE_FEATURE_HTTPD_AUTH_MD5) { |
| char *colon_after_user; |
| const char *passwd; |
| # if ENABLE_FEATURE_SHADOWPASSWDS && !ENABLE_PAM |
| char sp_buf[256]; |
| # endif |
| |
| colon_after_user = strchr(user_and_passwd, ':'); |
| if (!colon_after_user) |
| goto bad_input; |
| |
| /* compare "user:" */ |
| if (cur->after_colon[0] != '*' |
| && strncmp(cur->after_colon, user_and_passwd, |
| colon_after_user - user_and_passwd + 1) != 0 |
| ) { |
| continue; |
| } |
| /* this cfg entry is '*' or matches username from peer */ |
| |
| passwd = strchr(cur->after_colon, ':'); |
| if (!passwd) |
| goto bad_input; |
| passwd++; |
| if (passwd[0] == '*') { |
| # if ENABLE_PAM |
| struct pam_userinfo userinfo; |
| struct pam_conv conv_info = { &pam_talker, (void *) &userinfo }; |
| pam_handle_t *pamh; |
| |
| *colon_after_user = '\0'; |
| userinfo.name = user_and_passwd; |
| userinfo.pw = colon_after_user + 1; |
| r = pam_start("httpd", user_and_passwd, &conv_info, &pamh) != PAM_SUCCESS; |
| if (r == 0) { |
| r = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS |
| || pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS |
| ; |
| pam_end(pamh, PAM_SUCCESS); |
| } |
| *colon_after_user = ':'; |
| goto end_check_passwd; |
| # else |
| # if ENABLE_FEATURE_SHADOWPASSWDS |
| /* Using _r function to avoid pulling in static buffers */ |
| struct spwd spw; |
| # endif |
| struct passwd *pw; |
| |
| *colon_after_user = '\0'; |
| pw = getpwnam(user_and_passwd); |
| *colon_after_user = ':'; |
| if (!pw || !pw->pw_passwd) |
| continue; |
| passwd = pw->pw_passwd; |
| # if ENABLE_FEATURE_SHADOWPASSWDS |
| if ((passwd[0] == 'x' || passwd[0] == '*') && !passwd[1]) { |
| /* getspnam_r may return 0 yet set result to NULL. |
| * At least glibc 2.4 does this. Be extra paranoid here. */ |
| struct spwd *result = NULL; |
| r = getspnam_r(pw->pw_name, &spw, sp_buf, sizeof(sp_buf), &result); |
| if (r == 0 && result) |
| passwd = result->sp_pwdp; |
| } |
| # endif |
| /* In this case, passwd is ALWAYS encrypted: |
| * it came from /etc/passwd or /etc/shadow! |
| */ |
| goto check_encrypted; |
| # endif /* ENABLE_PAM */ |
| } |
| /* Else: passwd is from httpd.conf, it is either plaintext or encrypted */ |
| |
| if (passwd[0] == '$' && isdigit(passwd[1])) { |
| char *encrypted; |
| # if !ENABLE_PAM |
| check_encrypted: |
| # endif |
| /* encrypt pwd from peer and check match with local one */ |
| encrypted = pw_encrypt( |
| /* pwd (from peer): */ colon_after_user + 1, |
| /* salt: */ passwd, |
| /* cleanup: */ 0 |
| ); |
| r = strcmp(encrypted, passwd); |
| free(encrypted); |
| } else { |
| /* local passwd is from httpd.conf and it's plaintext */ |
| r = strcmp(colon_after_user + 1, passwd); |
| } |
| goto end_check_passwd; |
| } |
| bad_input: |
| /* Comparing plaintext "user:pass" in one go */ |
| r = strcmp(cur->after_colon, user_and_passwd); |
| end_check_passwd: |
| if (r == 0) { |
| remoteuser = xstrndup(user_and_passwd, |
| strchrnul(user_and_passwd, ':') - user_and_passwd |
| ); |
| return 1; /* Ok */ |
| } |
| } /* for */ |
| |
| /* 0(bad) if prev is set: matches were found but passwd was wrong */ |
| return (prev == NULL); |
| } |
| #endif /* FEATURE_HTTPD_BASIC_AUTH */ |
| |
| #if ENABLE_FEATURE_HTTPD_PROXY |
| static Htaccess_Proxy *find_proxy_entry(const char *url) |
| { |
| Htaccess_Proxy *p; |
| for (p = proxy; p; p = p->next) { |
| if (is_prefixed_with(url, p->url_from)) |
| return p; |
| } |
| return NULL; |
| } |
| #endif |
| |
| /* |
| * Handle timeouts |
| */ |
| static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN; |
| static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM) |
| { |
| send_headers_and_exit(HTTP_REQUEST_TIMEOUT); |
| } |
| |
| /* |
| * Handle an incoming http request and exit. |
| */ |
| static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN; |
| static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) |
| { |
| static const char request_GET[] ALIGN1 = "GET"; |
| struct stat sb; |
| char *urlcopy; |
| char *urlp; |
| char *tptr; |
| unsigned remote_ip; |
| #if ENABLE_FEATURE_HTTPD_CGI |
| unsigned total_headers_len; |
| #endif |
| #if ENABLE_FEATURE_HTTPD_CGI |
| static const char request_HEAD[] ALIGN1 = "HEAD"; |
| const char *prequest; |
| unsigned long length = 0; |
| enum CGI_type cgi_type = CGI_NONE; |
| #elif ENABLE_FEATURE_HTTPD_PROXY |
| #define prequest request_GET |
| unsigned long length = 0; |
| #endif |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| smallint authorized = -1; |
| #endif |
| char *HTTP_slash; |
| |
| /* Allocation of iobuf is postponed until now |
| * (IOW, server process doesn't need to waste 8k) */ |
| iobuf = xmalloc(IOBUF_SIZE); |
| |
| remote_ip = 0; |
| if (fromAddr->u.sa.sa_family == AF_INET) { |
| remote_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr); |
| } |
| #if ENABLE_FEATURE_IPV6 |
| if (fromAddr->u.sa.sa_family == AF_INET6 |
| && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0 |
| && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0 |
| && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff) |
| remote_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]); |
| #endif |
| if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) { |
| /* NB: can be NULL (user runs httpd -i by hand?) */ |
| rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa); |
| } |
| if (verbose) { |
| /* this trick makes -v logging much simpler */ |
| if (rmt_ip_str) |
| applet_name = rmt_ip_str; |
| if (verbose > 2) |
| bb_simple_error_msg("connected"); |
| } |
| if_ip_denied_send_HTTP_FORBIDDEN_and_exit(remote_ip); |
| |
| /* Install timeout handler. get_line() needs it. */ |
| signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit); |
| |
| if (!get_line()) /* EOF or error or empty line */ |
| send_headers_and_exit(HTTP_BAD_REQUEST); |
| |
| /* Determine type of request (GET/POST) */ |
| // rfc2616: method and URI is separated by exactly one space |
| //urlp = strpbrk(iobuf, " \t"); - no, tab isn't allowed |
| urlp = strchr(iobuf, ' '); |
| if (urlp == NULL) |
| send_headers_and_exit(HTTP_BAD_REQUEST); |
| *urlp++ = '\0'; |
| #if ENABLE_FEATURE_HTTPD_CGI |
| prequest = request_GET; |
| if (strcasecmp(iobuf, prequest) != 0) { |
| prequest = request_HEAD; |
| if (strcasecmp(iobuf, prequest) != 0) { |
| prequest = "POST"; |
| if (strcasecmp(iobuf, prequest) != 0) |
| send_headers_and_exit(HTTP_NOT_IMPLEMENTED); |
| } |
| } |
| #else |
| if (strcasecmp(iobuf, request_GET) != 0) |
| send_headers_and_exit(HTTP_NOT_IMPLEMENTED); |
| #endif |
| // rfc2616: method and URI is separated by exactly one space |
| //urlp = skip_whitespace(urlp); - should not be necessary |
| if (urlp[0] != '/') |
| send_headers_and_exit(HTTP_BAD_REQUEST); |
| |
| /* Find end of URL */ |
| HTTP_slash = strchr(urlp, ' '); |
| /* Is it " HTTP/"? */ |
| if (!HTTP_slash || strncmp(HTTP_slash + 1, HTTP_200, 5) != 0) |
| send_headers_and_exit(HTTP_BAD_REQUEST); |
| *HTTP_slash++ = '\0'; |
| |
| /* Copy URL from after "GET "/"POST " to stack-allocated char[] */ |
| urlcopy = alloca((HTTP_slash - urlp) + 2 + strlen(index_page)); |
| /*if (urlcopy == NULL) |
| * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/ |
| strcpy(urlcopy, urlp); |
| /* NB: urlcopy ptr is never changed after this */ |
| |
| #if ENABLE_FEATURE_HTTPD_PROXY |
| { |
| int proxy_fd; |
| len_and_sockaddr *lsa; |
| Htaccess_Proxy *proxy_entry = find_proxy_entry(urlcopy); |
| |
| if (proxy_entry) { |
| if (verbose > 1) |
| bb_error_msg("proxy:%s", urlcopy); |
| lsa = host2sockaddr(proxy_entry->host_port, 80); |
| if (!lsa) |
| send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); |
| proxy_fd = socket(lsa->u.sa.sa_family, SOCK_STREAM, 0); |
| if (proxy_fd < 0) |
| send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); |
| if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0) |
| send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); |
| /* Disable peer header reading timeout */ |
| alarm(0); |
| /* Config directive was of the form: |
| * P:/url:[http://]hostname[:port]/new/path |
| * When /urlSFX is requested, reverse proxy it |
| * to http://hostname[:port]/new/pathSFX |
| */ |
| fdprintf(proxy_fd, "%s %s%s %s\r\n", |
| prequest, /* "GET" or "POST" */ |
| proxy_entry->url_to, /* "/new/path" */ |
| urlcopy + strlen(proxy_entry->url_from), /* "SFX" */ |
| HTTP_slash /* "HTTP/xyz" */ |
| ); |
| cgi_io_loop_and_exit(proxy_fd, proxy_fd, /*max POST length:*/ INT_MAX); |
| } |
| } |
| #endif |
| |
| /* Extract url args if present */ |
| g_query = strchr(urlcopy, '?'); |
| if (g_query) |
| *g_query++ = '\0'; |
| |
| /* Decode URL escape sequences */ |
| tptr = percent_decode_in_place(urlcopy, /*strict:*/ 1); |
| if (tptr == NULL) |
| send_headers_and_exit(HTTP_BAD_REQUEST); |
| if (tptr == urlcopy + 1) { |
| /* '/' or NUL is encoded */ |
| send_headers_and_exit(HTTP_NOT_FOUND); |
| } |
| |
| /* Canonicalize path */ |
| /* Algorithm stolen from libbb bb_simplify_path(), |
| * but don't strdup, retain trailing slash, protect root */ |
| urlp = tptr = urlcopy; |
| for (;;) { |
| if (*urlp == '/') { |
| /* skip duplicate (or initial) slash */ |
| if (*tptr == '/') { |
| goto next_char; |
| } |
| if (*tptr == '.') { |
| if (tptr[1] == '.' && (tptr[2] == '/' || tptr[2] == '\0')) { |
| /* "..": be careful */ |
| /* protect root */ |
| if (urlp == urlcopy) |
| send_headers_and_exit(HTTP_BAD_REQUEST); |
| /* omit previous dir */ |
| while (*--urlp != '/') |
| continue; |
| /* skip to "./" or ".<NUL>" */ |
| tptr++; |
| } |
| if (tptr[1] == '/' || tptr[1] == '\0') { |
| /* skip extra "/./" */ |
| goto next_char; |
| } |
| } |
| } |
| *++urlp = *tptr; |
| if (*tptr == '\0') |
| break; |
| next_char: |
| tptr++; |
| } |
| |
| /* If URL is a directory, add '/' */ |
| if (urlp[-1] != '/') { |
| if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) { |
| found_moved_temporarily = urlcopy; |
| } |
| } |
| |
| /* Log it */ |
| if (verbose > 1) |
| bb_error_msg("url:%s", urlcopy); |
| |
| tptr = urlcopy; |
| while ((tptr = strchr(tptr + 1, '/')) != NULL) { |
| /* have path1/path2 */ |
| *tptr = '\0'; |
| if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) { |
| /* may have subdir config */ |
| parse_conf(urlcopy + 1, SUBDIR_PARSE); |
| if_ip_denied_send_HTTP_FORBIDDEN_and_exit(remote_ip); |
| } |
| *tptr = '/'; |
| } |
| |
| tptr = urlcopy + 1; /* skip first '/' */ |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| if (is_prefixed_with(tptr, "cgi-bin/")) { |
| if (tptr[8] == '\0') { |
| /* protect listing "cgi-bin/" */ |
| send_headers_and_exit(HTTP_FORBIDDEN); |
| } |
| cgi_type = CGI_NORMAL; |
| } |
| #endif |
| |
| if (urlp[-1] == '/') { |
| /* When index_page string is appended to <dir>/ URL, it overwrites |
| * the query string. If we fall back to call /cgi-bin/index.cgi, |
| * query string would be lost and not available to the CGI. |
| * Work around it by making a deep copy. |
| */ |
| if (ENABLE_FEATURE_HTTPD_CGI) |
| g_query = xstrdup(g_query); /* ok for NULL too */ |
| strcpy(urlp, index_page); |
| } |
| if (stat(tptr, &sb) == 0) { |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| char *suffix = strrchr(tptr, '.'); |
| if (suffix) { |
| Htaccess *cur; |
| for (cur = script_i; cur; cur = cur->next) { |
| if (strcmp(cur->before_colon + 1, suffix) == 0) { |
| cgi_type = CGI_INTERPRETER; |
| break; |
| } |
| } |
| } |
| #endif |
| if (!found_moved_temporarily) { |
| file_size = sb.st_size; |
| last_mod = sb.st_mtime; |
| } |
| } |
| #if ENABLE_FEATURE_HTTPD_CGI |
| else if (urlp[-1] == '/') { |
| /* It's a dir URL and there is no index.html |
| * Try cgi-bin/index.cgi */ |
| if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) { |
| cgi_type = CGI_INDEX; |
| } |
| } |
| #endif |
| urlp[0] = '\0'; |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| total_headers_len = 0; |
| #endif |
| |
| /* Read until blank line */ |
| while (1) { |
| unsigned iobuf_len = get_line(); |
| if (!iobuf_len) |
| break; /* EOF or error or empty line */ |
| #if ENABLE_FEATURE_HTTPD_CGI |
| /* Prevent unlimited growth of HTTP_xyz envvars */ |
| total_headers_len += iobuf_len; |
| if (total_headers_len >= MAX_HTTP_HEADERS_SIZE) |
| send_headers_and_exit(HTTP_ENTITY_TOO_LARGE); |
| #endif |
| if (DEBUG) |
| bb_error_msg("header: '%s'", iobuf); |
| #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY |
| /* Try and do our best to parse more lines */ |
| if (STRNCASECMP(iobuf, "Content-Length:") == 0) { |
| /* extra read only for POST */ |
| if (prequest != request_GET |
| # if ENABLE_FEATURE_HTTPD_CGI |
| && prequest != request_HEAD |
| # endif |
| ) { |
| tptr = skip_whitespace(iobuf + sizeof("Content-Length:") - 1); |
| if (!tptr[0]) |
| send_headers_and_exit(HTTP_BAD_REQUEST); |
| /* not using strtoul: it ignores leading minus! */ |
| length = bb_strtou(tptr, NULL, 10); |
| /* length is "ulong", but we need to pass it to int later */ |
| if (errno || length > INT_MAX) |
| send_headers_and_exit(HTTP_BAD_REQUEST); |
| } |
| continue; |
| } |
| #endif |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (STRNCASECMP(iobuf, "Authorization:") == 0) { |
| /* We only allow Basic credentials. |
| * It shows up as "Authorization: Basic <user>:<passwd>" where |
| * "<user>:<passwd>" is base64 encoded. |
| */ |
| tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1); |
| if (STRNCASECMP(tptr, "Basic") == 0) { |
| tptr += sizeof("Basic")-1; |
| /* decodeBase64() skips whitespace itself */ |
| decodeBase64(tptr); |
| authorized = check_user_passwd(urlcopy, tptr); |
| continue; |
| } |
| } |
| #endif |
| #if ENABLE_FEATURE_HTTPD_RANGES |
| if (STRNCASECMP(iobuf, "Range:") == 0) { |
| /* We know only bytes=NNN-[MMM] */ |
| char *s = skip_whitespace(iobuf + sizeof("Range:")-1); |
| if (is_prefixed_with(s, "bytes=")) { |
| s += sizeof("bytes=")-1; |
| range_start = BB_STRTOOFF(s, &s, 10); |
| if (s[0] != '-' || range_start < 0) { |
| range_start = -1; |
| } else if (s[1]) { |
| range_end = BB_STRTOOFF(s+1, NULL, 10); |
| if (errno || range_end < range_start) |
| range_start = -1; |
| } |
| } |
| continue; |
| } |
| #endif |
| #if ENABLE_FEATURE_HTTPD_GZIP |
| if (STRNCASECMP(iobuf, "Accept-Encoding:") == 0) { |
| /* Note: we do not support "gzip;q=0" |
| * method of _disabling_ gzip |
| * delivery. No one uses that, though */ |
| const char *s = strstr(iobuf, "gzip"); |
| if (s) { |
| // want more thorough checks? |
| //if (s[-1] == ' ' |
| // || s[-1] == ',' |
| // || s[-1] == ':' |
| //) { |
| content_gzip = 1; |
| //} |
| } |
| continue; |
| } |
| #endif |
| #if ENABLE_FEATURE_HTTPD_CGI |
| if (cgi_type != CGI_NONE) { |
| bool ct = (STRNCASECMP(iobuf, "Content-Type:") == 0); |
| char *cp; |
| char *colon = strchr(iobuf, ':'); |
| |
| if (!colon) |
| continue; |
| cp = iobuf; |
| while (cp < colon) { |
| /* a-z => A-Z, not-alnum => _ */ |
| char c = (*cp & ~0x20); /* toupper for A-Za-z, undef for others */ |
| if ((unsigned)(c - 'A') <= ('Z' - 'A')) { |
| *cp++ = c; |
| continue; |
| } |
| if (!isdigit(*cp)) |
| *cp = '_'; |
| cp++; |
| } |
| /* "Content-Type:" gets no HTTP_ prefix, all others do */ |
| cp = xasprintf(ct ? "HTTP_%.*s=%s" + 5 : "HTTP_%.*s=%s", |
| (int)(colon - iobuf), iobuf, |
| skip_whitespace(colon + 1) |
| ); |
| putenv(cp); |
| } |
| #endif |
| } /* while extra header reading */ |
| |
| /* We are done reading headers, disable peer timeout */ |
| alarm(0); |
| |
| if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0) { |
| /* protect listing [/path]/httpd.conf or IP deny */ |
| send_headers_and_exit(HTTP_FORBIDDEN); |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| /* Case: no "Authorization:" was seen, but page might require passwd. |
| * Check that with dummy user:pass */ |
| if (authorized < 0) |
| authorized = check_user_passwd(urlcopy, (char *) ""); |
| if (!authorized) |
| send_headers_and_exit(HTTP_UNAUTHORIZED); |
| #endif |
| |
| if (found_moved_temporarily) { |
| send_headers_and_exit(HTTP_MOVED_TEMPORARILY); |
| } |
| |
| tptr = urlcopy + 1; /* skip first '/' */ |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| if (cgi_type != CGI_NONE) { |
| send_cgi_and_exit( |
| (cgi_type == CGI_INDEX) ? "/cgi-bin/index.cgi" |
| /*CGI_NORMAL or CGI_INTERPRETER*/ : urlcopy, |
| urlcopy, prequest, length |
| ); |
| } |
| #endif |
| |
| if (urlp[-1] == '/') { |
| strcpy(urlp, index_page); |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| if (prequest != request_GET && prequest != request_HEAD) { |
| /* POST for files does not make sense */ |
| send_headers_and_exit(HTTP_NOT_IMPLEMENTED); |
| } |
| send_file_and_exit(tptr, |
| (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS) |
| ); |
| #else |
| send_file_and_exit(tptr, SEND_HEADERS_AND_BODY); |
| #endif |
| } |
| |
| /* |
| * The main http server function. |
| * Given a socket, listen for new connections and farm out |
| * the processing as a [v]forked process. |
| * Never returns. |
| */ |
| #if BB_MMU |
| static void mini_httpd(int server_socket) NORETURN; |
| static void mini_httpd(int server_socket) |
| { |
| /* NB: it's best to not use xfuncs in this loop before fork(). |
| * Otherwise server may die on transient errors (temporary |
| * out-of-memory condition, etc), which is Bad(tm). |
| * Try to do any dangerous calls after fork. |
| */ |
| while (1) { |
| int n; |
| len_and_sockaddr fromAddr; |
| |
| /* Wait for connections... */ |
| fromAddr.len = LSA_SIZEOF_SA; |
| n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len); |
| if (n < 0) |
| continue; |
| |
| /* set the KEEPALIVE option to cull dead connections */ |
| setsockopt_keepalive(n); |
| |
| if (fork() == 0) { |
| /* child */ |
| /* Do not reload config on HUP */ |
| signal(SIGHUP, SIG_IGN); |
| close(server_socket); |
| xmove_fd(n, 0); |
| xdup2(0, 1); |
| |
| handle_incoming_and_exit(&fromAddr); |
| } |
| /* parent, or fork failed */ |
| close(n); |
| } /* while (1) */ |
| /* never reached */ |
| } |
| #else |
| static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN; |
| static void mini_httpd_nommu(int server_socket, int argc, char **argv) |
| { |
| char *argv_copy[argc + 2]; |
| |
| argv_copy[0] = argv[0]; |
| argv_copy[1] = (char*)"-i"; |
| memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0])); |
| |
| /* NB: it's best to not use xfuncs in this loop before vfork(). |
| * Otherwise server may die on transient errors (temporary |
| * out-of-memory condition, etc), which is Bad(tm). |
| * Try to do any dangerous calls after fork. |
| */ |
| while (1) { |
| int n; |
| |
| /* Wait for connections... */ |
| n = accept(server_socket, NULL, NULL); |
| if (n < 0) |
| continue; |
| |
| /* set the KEEPALIVE option to cull dead connections */ |
| setsockopt_keepalive(n); |
| |
| if (vfork() == 0) { |
| /* child */ |
| /* Do not reload config on HUP */ |
| signal(SIGHUP, SIG_IGN); |
| close(server_socket); |
| xmove_fd(n, 0); |
| xdup2(0, 1); |
| |
| /* Run a copy of ourself in inetd mode */ |
| re_exec(argv_copy); |
| } |
| argv_copy[0][0] &= 0x7f; |
| /* parent, or vfork failed */ |
| close(n); |
| } /* while (1) */ |
| /* never reached */ |
| } |
| #endif |
| |
| /* |
| * Process a HTTP connection on stdin/out. |
| * Never returns. |
| */ |
| static void mini_httpd_inetd(void) NORETURN; |
| static void mini_httpd_inetd(void) |
| { |
| len_and_sockaddr fromAddr; |
| |
| memset(&fromAddr, 0, sizeof(fromAddr)); |
| fromAddr.len = LSA_SIZEOF_SA; |
| /* NB: can fail if user runs it by hand and types in http cmds */ |
| getpeername(0, &fromAddr.u.sa, &fromAddr.len); |
| handle_incoming_and_exit(&fromAddr); |
| } |
| |
| static void sighup_handler(int sig UNUSED_PARAM) |
| { |
| int sv = errno; |
| parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE); |
| errno = sv; |
| } |
| |
| enum { |
| c_opt_config_file = 0, |
| d_opt_decode_url, |
| h_opt_home_httpd, |
| IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,) |
| IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,) |
| IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,) |
| IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,) |
| p_opt_port , |
| p_opt_inetd , |
| p_opt_foreground, |
| p_opt_verbose , |
| OPT_CONFIG_FILE = 1 << c_opt_config_file, |
| OPT_DECODE_URL = 1 << d_opt_decode_url, |
| OPT_HOME_HTTPD = 1 << h_opt_home_httpd, |
| OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0, |
| OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0, |
| OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0, |
| OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0, |
| OPT_PORT = 1 << p_opt_port, |
| OPT_INETD = 1 << p_opt_inetd, |
| OPT_FOREGROUND = 1 << p_opt_foreground, |
| OPT_VERBOSE = 1 << p_opt_verbose, |
| }; |
| |
| |
| int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int httpd_main(int argc UNUSED_PARAM, char **argv) |
| { |
| int server_socket = server_socket; /* for gcc */ |
| unsigned opt; |
| char *url_for_decode; |
| IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;) |
| IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;) |
| IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;) |
| IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;) |
| |
| INIT_G(); |
| |
| #if ENABLE_LOCALE_SUPPORT |
| /* Undo busybox.c: we want to speak English in http (dates etc) */ |
| setlocale(LC_TIME, "C"); |
| #endif |
| |
| home_httpd = xrealloc_getcwd_or_warn(NULL); |
| /* We do not "absolutize" path given by -h (home) opt. |
| * If user gives relative path in -h, |
| * $SCRIPT_FILENAME will not be set. */ |
| opt = getopt32(argv, "^" |
| "c:d:h:" |
| IF_FEATURE_HTTPD_ENCODE_URL_STR("e:") |
| IF_FEATURE_HTTPD_BASIC_AUTH("r:") |
| IF_FEATURE_HTTPD_AUTH_MD5("m:") |
| IF_FEATURE_HTTPD_SETUID("u:") |
| "p:ifv" |
| "\0" |
| /* -v counts, -i implies -f */ |
| "vv:if", |
| &opt_c_configFile, &url_for_decode, &home_httpd |
| IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode) |
| IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm) |
| IF_FEATURE_HTTPD_AUTH_MD5(, &pass) |
| IF_FEATURE_HTTPD_SETUID(, &s_ugid) |
| , &bind_addr_or_port |
| , &verbose |
| ); |
| if (opt & OPT_DECODE_URL) { |
| fputs(percent_decode_in_place(url_for_decode, /*strict:*/ 0), stdout); |
| return 0; |
| } |
| #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR |
| if (opt & OPT_ENCODE_URL) { |
| fputs(encodeString(url_for_encode), stdout); |
| return 0; |
| } |
| #endif |
| #if ENABLE_FEATURE_HTTPD_AUTH_MD5 |
| if (opt & OPT_MD5) { |
| char salt[sizeof("$1$XXXXXXXX")]; |
| salt[0] = '$'; |
| salt[1] = '1'; |
| salt[2] = '$'; |
| crypt_make_salt(salt + 3, 4); |
| puts(pw_encrypt(pass, salt, /*cleanup:*/ 0)); |
| return 0; |
| } |
| #endif |
| #if ENABLE_FEATURE_HTTPD_SETUID |
| if (opt & OPT_SETUID) { |
| xget_uidgid(&ugid, s_ugid); |
| } |
| #endif |
| |
| #if !BB_MMU |
| if (!(opt & OPT_FOREGROUND)) { |
| bb_daemonize_or_rexec(0, argv); /* don't change current directory */ |
| } |
| #endif |
| |
| /* Chdir to home (unless we were re-execed for NOMMU case: |
| * we are already in the home dir then). |
| */ |
| if (!re_execed) |
| xchdir(home_httpd); |
| |
| if (!(opt & OPT_INETD)) { |
| signal(SIGCHLD, SIG_IGN); |
| server_socket = openServer(); |
| #if ENABLE_FEATURE_HTTPD_SETUID |
| /* drop privileges */ |
| if (opt & OPT_SETUID) { |
| if (ugid.gid != (gid_t)-1) { |
| if (setgroups(1, &ugid.gid) == -1) |
| bb_simple_perror_msg_and_die("setgroups"); |
| xsetgid(ugid.gid); |
| } |
| xsetuid(ugid.uid); |
| } |
| #endif |
| } |
| |
| #if 0 |
| /* User can do it himself: 'env - PATH="$PATH" httpd' |
| * We don't do it because we don't want to screw users |
| * which want to do |
| * 'env - VAR1=val1 VAR2=val2 httpd' |
| * and have VAR1 and VAR2 values visible in their CGIs. |
| * Besides, it is also smaller. */ |
| { |
| char *p = getenv("PATH"); |
| /* env strings themself are not freed, no need to xstrdup(p): */ |
| clearenv(); |
| if (p) |
| putenv(p - 5); |
| // if (!(opt & OPT_INETD)) |
| // setenv_long("SERVER_PORT", ???); |
| } |
| #endif |
| |
| parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE); |
| if (!(opt & OPT_INETD)) |
| signal(SIGHUP, sighup_handler); |
| |
| xfunc_error_retval = 0; |
| if (opt & OPT_INETD) |
| mini_httpd_inetd(); /* never returns */ |
| #if BB_MMU |
| if (!(opt & OPT_FOREGROUND)) |
| bb_daemonize(0); /* don't change current directory */ |
| mini_httpd(server_socket); /* never returns */ |
| #else |
| mini_httpd_nommu(server_socket, argc, argv); /* never returns */ |
| #endif |
| /* return 0; */ |
| } |