| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <stdarg.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/prctl.h> |
| #include <sys/uio.h> |
| #include <syslog.h> |
| |
| #include <private/android_filesystem_config.h> |
| #include <private/android_logger.h> |
| |
| #include "LogBuffer.h" |
| #include "LogKlog.h" |
| #include "LogReader.h" |
| |
| #define KMSG_PRIORITY(PRI) \ |
| '<', '0' + (LOG_SYSLOG | (PRI)) / 10, '0' + (LOG_SYSLOG | (PRI)) % 10, '>' |
| |
| static const char priority_message[] = { KMSG_PRIORITY(LOG_INFO), '\0' }; |
| |
| // List of the _only_ needles we supply here to android::strnstr |
| static const char suspendStr[] = "PM: suspend entry "; |
| static const char resumeStr[] = "PM: suspend exit "; |
| static const char suspendedStr[] = "Suspended for "; |
| static const char healthdStr[] = "healthd"; |
| static const char batteryStr[] = ": battery "; |
| static const char auditStr[] = " audit("; |
| static const char klogdStr[] = "logd.klogd: "; |
| |
| // Parsing is hard |
| |
| // called if we see a '<', s is the next character, returns pointer after '>' |
| static char* is_prio(char* s, ssize_t len) { |
| if ((len <= 0) || !isdigit(*s++)) return nullptr; |
| --len; |
| static const size_t max_prio_len = (len < 4) ? len : 4; |
| size_t priolen = 0; |
| char c; |
| while (((c = *s++)) && (++priolen <= max_prio_len)) { |
| if (!isdigit(c)) return ((c == '>') && (*s == '[')) ? s : nullptr; |
| } |
| return nullptr; |
| } |
| |
| // called if we see a '[', s is the next character, returns pointer after ']' |
| static char* is_timestamp(char* s, ssize_t len) { |
| while ((len > 0) && (*s == ' ')) { |
| ++s; |
| --len; |
| } |
| if ((len <= 0) || !isdigit(*s++)) return nullptr; |
| --len; |
| bool first_period = true; |
| char c; |
| while ((len > 0) && ((c = *s++))) { |
| --len; |
| if ((c == '.') && first_period) { |
| first_period = false; |
| } else if (!isdigit(c)) { |
| return ((c == ']') && !first_period && (*s == ' ')) ? s : nullptr; |
| } |
| } |
| return nullptr; |
| } |
| |
| // Like strtok_r with "\r\n" except that we look for log signatures (regex) |
| // \(\(<[0-9]\{1,4\}>\)\([[] *[0-9]+[.][0-9]+[]] \)\{0,1\}\|[[] |
| // *[0-9]+[.][0-9]+[]] \) |
| // and split if we see a second one without a newline. |
| // We allow nuls in content, monitoring the overall length and sub-length of |
| // the discovered tokens. |
| |
| #define SIGNATURE_MASK 0xF0 |
| // <digit> following ('0' to '9' masked with ~SIGNATURE_MASK) added to signature |
| #define LESS_THAN_SIG SIGNATURE_MASK |
| #define OPEN_BRACKET_SIG ((SIGNATURE_MASK << 1) & SIGNATURE_MASK) |
| // space is one more than <digit> of 9 |
| #define OPEN_BRACKET_SPACE ((char)(OPEN_BRACKET_SIG | 10)) |
| |
| char* android::log_strntok_r(char* s, ssize_t& len, char*& last, |
| ssize_t& sublen) { |
| sublen = 0; |
| if (len <= 0) return nullptr; |
| if (!s) { |
| if (!(s = last)) return nullptr; |
| // fixup for log signature split <, |
| // LESS_THAN_SIG + <digit> |
| if ((*s & SIGNATURE_MASK) == LESS_THAN_SIG) { |
| *s = (*s & ~SIGNATURE_MASK) + '0'; |
| *--s = '<'; |
| ++len; |
| } |
| // fixup for log signature split [, |
| // OPEN_BRACKET_SPACE is space, OPEN_BRACKET_SIG + <digit> |
| if ((*s & SIGNATURE_MASK) == OPEN_BRACKET_SIG) { |
| *s = (*s == OPEN_BRACKET_SPACE) ? ' ' : (*s & ~SIGNATURE_MASK) + '0'; |
| *--s = '['; |
| ++len; |
| } |
| } |
| |
| while ((len > 0) && ((*s == '\r') || (*s == '\n'))) { |
| ++s; |
| --len; |
| } |
| |
| if (len <= 0) return last = nullptr; |
| char *peek, *tok = s; |
| |
| for (;;) { |
| if (len <= 0) { |
| last = nullptr; |
| return tok; |
| } |
| char c = *s++; |
| --len; |
| ssize_t adjust; |
| switch (c) { |
| case '\r': |
| case '\n': |
| s[-1] = '\0'; |
| last = s; |
| return tok; |
| |
| case '<': |
| peek = is_prio(s, len); |
| if (!peek) break; |
| if (s != (tok + 1)) { // not first? |
| s[-1] = '\0'; |
| *s &= ~SIGNATURE_MASK; |
| *s |= LESS_THAN_SIG; // signature for '<' |
| last = s; |
| return tok; |
| } |
| adjust = peek - s; |
| if (adjust > len) { |
| adjust = len; |
| } |
| sublen += adjust; |
| len -= adjust; |
| s = peek; |
| if ((*s == '[') && ((peek = is_timestamp(s + 1, len - 1)))) { |
| adjust = peek - s; |
| if (adjust > len) { |
| adjust = len; |
| } |
| sublen += adjust; |
| len -= adjust; |
| s = peek; |
| } |
| break; |
| |
| case '[': |
| peek = is_timestamp(s, len); |
| if (!peek) break; |
| if (s != (tok + 1)) { // not first? |
| s[-1] = '\0'; |
| if (*s == ' ') { |
| *s = OPEN_BRACKET_SPACE; |
| } else { |
| *s &= ~SIGNATURE_MASK; |
| *s |= OPEN_BRACKET_SIG; // signature for '[' |
| } |
| last = s; |
| return tok; |
| } |
| adjust = peek - s; |
| if (adjust > len) { |
| adjust = len; |
| } |
| sublen += adjust; |
| len -= adjust; |
| s = peek; |
| break; |
| } |
| ++sublen; |
| } |
| // NOTREACHED |
| } |
| |
| log_time LogKlog::correction = |
| (log_time(CLOCK_REALTIME) < log_time(CLOCK_MONOTONIC)) |
| ? log_time::EPOCH |
| : (log_time(CLOCK_REALTIME) - log_time(CLOCK_MONOTONIC)); |
| |
| LogKlog::LogKlog(LogBuffer* buf, LogReader* reader, int fdWrite, int fdRead, |
| bool auditd) |
| : SocketListener(fdRead, false), |
| logbuf(buf), |
| reader(reader), |
| signature(CLOCK_MONOTONIC), |
| initialized(false), |
| enableLogging(true), |
| auditd(auditd) { |
| static const char klogd_message[] = "%s%s%" PRIu64 "\n"; |
| char buffer[strlen(priority_message) + strlen(klogdStr) + |
| strlen(klogd_message) + 20]; |
| snprintf(buffer, sizeof(buffer), klogd_message, priority_message, klogdStr, |
| signature.nsec()); |
| write(fdWrite, buffer, strlen(buffer)); |
| } |
| |
| bool LogKlog::onDataAvailable(SocketClient* cli) { |
| if (!initialized) { |
| prctl(PR_SET_NAME, "logd.klogd"); |
| initialized = true; |
| enableLogging = false; |
| } |
| |
| char buffer[LOGGER_ENTRY_MAX_PAYLOAD]; |
| ssize_t len = 0; |
| |
| for (;;) { |
| ssize_t retval = 0; |
| if (len < (ssize_t)(sizeof(buffer) - 1)) { |
| retval = |
| read(cli->getSocket(), buffer + len, sizeof(buffer) - 1 - len); |
| } |
| if ((retval == 0) && (len <= 0)) { |
| break; |
| } |
| if (retval < 0) { |
| return false; |
| } |
| len += retval; |
| bool full = len == (sizeof(buffer) - 1); |
| char* ep = buffer + len; |
| *ep = '\0'; |
| ssize_t sublen; |
| for (char *ptr = nullptr, *tok = buffer; |
| !!(tok = android::log_strntok_r(tok, len, ptr, sublen)); |
| tok = nullptr) { |
| if (((tok + sublen) >= ep) && (retval != 0) && full) { |
| if (sublen > 0) memmove(buffer, tok, sublen); |
| len = sublen; |
| break; |
| } |
| if ((sublen > 0) && *tok) { |
| log(tok, sublen); |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| void LogKlog::calculateCorrection(const log_time& monotonic, |
| const char* real_string, ssize_t len) { |
| static const char real_format[] = "%Y-%m-%d %H:%M:%S.%09q UTC"; |
| if (len < (ssize_t)(strlen(real_format) + 5)) return; |
| |
| log_time real; |
| const char* ep = real.strptime(real_string, real_format); |
| if (!ep || (ep > &real_string[len]) || (real > log_time(CLOCK_REALTIME))) { |
| return; |
| } |
| // kernel report UTC, log_time::strptime is localtime from calendar. |
| // Bionic and liblog strptime does not support %z or %Z to pick up |
| // timezone so we are calculating our own correction. |
| time_t now = real.tv_sec; |
| struct tm tm; |
| memset(&tm, 0, sizeof(tm)); |
| tm.tm_isdst = -1; |
| localtime_r(&now, &tm); |
| if ((tm.tm_gmtoff < 0) && ((-tm.tm_gmtoff) > (long)real.tv_sec)) { |
| real = log_time::EPOCH; |
| } else { |
| real.tv_sec += tm.tm_gmtoff; |
| } |
| if (monotonic > real) { |
| correction = log_time::EPOCH; |
| } else { |
| correction = real - monotonic; |
| } |
| } |
| |
| void LogKlog::sniffTime(log_time& now, const char*& buf, ssize_t len, |
| bool reverse) { |
| if (len <= 0) return; |
| |
| const char* cp = nullptr; |
| if ((len > 10) && (*buf == '[')) { |
| cp = now.strptime(buf, "[ %s.%q]"); // can index beyond buffer bounds |
| if (cp && (cp > &buf[len - 1])) cp = nullptr; |
| } |
| if (cp) { |
| len -= cp - buf; |
| if ((len > 0) && isspace(*cp)) { |
| ++cp; |
| --len; |
| } |
| buf = cp; |
| |
| if (isMonotonic()) return; |
| |
| const char* b; |
| if (((b = android::strnstr(cp, len, suspendStr))) && |
| (((b += strlen(suspendStr)) - cp) < len)) { |
| len -= b - cp; |
| calculateCorrection(now, b, len); |
| } else if (((b = android::strnstr(cp, len, resumeStr))) && |
| (((b += strlen(resumeStr)) - cp) < len)) { |
| len -= b - cp; |
| calculateCorrection(now, b, len); |
| } else if (((b = android::strnstr(cp, len, healthdStr))) && |
| (((b += strlen(healthdStr)) - cp) < len) && |
| ((b = android::strnstr(b, len -= b - cp, batteryStr))) && |
| (((b += strlen(batteryStr)) - cp) < len)) { |
| // NB: healthd is roughly 150us late, so we use it instead to |
| // trigger a check for ntp-induced or hardware clock drift. |
| log_time real(CLOCK_REALTIME); |
| log_time mono(CLOCK_MONOTONIC); |
| correction = (real < mono) ? log_time::EPOCH : (real - mono); |
| } else if (((b = android::strnstr(cp, len, suspendedStr))) && |
| (((b += strlen(suspendStr)) - cp) < len)) { |
| len -= b - cp; |
| log_time real; |
| char* endp; |
| real.tv_sec = strtol(b, &endp, 10); |
| if ((*endp == '.') && ((endp - b) < len)) { |
| unsigned long multiplier = NS_PER_SEC; |
| real.tv_nsec = 0; |
| len -= endp - b; |
| while (--len && isdigit(*++endp) && (multiplier /= 10)) { |
| real.tv_nsec += (*endp - '0') * multiplier; |
| } |
| if (reverse) { |
| if (real > correction) { |
| correction = log_time::EPOCH; |
| } else { |
| correction -= real; |
| } |
| } else { |
| correction += real; |
| } |
| } |
| } |
| |
| convertMonotonicToReal(now); |
| } else { |
| if (isMonotonic()) { |
| now = log_time(CLOCK_MONOTONIC); |
| } else { |
| now = log_time(CLOCK_REALTIME); |
| } |
| } |
| } |
| |
| pid_t LogKlog::sniffPid(const char*& buf, ssize_t len) { |
| if (len <= 0) return 0; |
| |
| const char* cp = buf; |
| // sscanf does a strlen, let's check if the string is not nul terminated. |
| // pseudo out-of-bounds access since we always have an extra char on buffer. |
| if (((ssize_t)strnlen(cp, len) == len) && cp[len]) { |
| return 0; |
| } |
| // HTC kernels with modified printk "c0 1648 " |
| if ((len > 9) && (cp[0] == 'c') && isdigit(cp[1]) && |
| (isdigit(cp[2]) || (cp[2] == ' ')) && (cp[3] == ' ')) { |
| bool gotDigit = false; |
| int i; |
| for (i = 4; i < 9; ++i) { |
| if (isdigit(cp[i])) { |
| gotDigit = true; |
| } else if (gotDigit || (cp[i] != ' ')) { |
| break; |
| } |
| } |
| if ((i == 9) && (cp[i] == ' ')) { |
| int pid = 0; |
| char dummy; |
| if (sscanf(cp + 4, "%d%c", &pid, &dummy) == 2) { |
| buf = cp + 10; // skip-it-all |
| return pid; |
| } |
| } |
| } |
| while (len) { |
| // Mediatek kernels with modified printk |
| if (*cp == '[') { |
| int pid = 0; |
| char dummy; |
| if (sscanf(cp, "[%d:%*[a-z_./0-9:A-Z]]%c", &pid, &dummy) == 2) { |
| return pid; |
| } |
| break; // Only the first one |
| } |
| ++cp; |
| --len; |
| } |
| return 0; |
| } |
| |
| // kernel log prefix, convert to a kernel log priority number |
| static int parseKernelPrio(const char*& buf, ssize_t len) { |
| int pri = LOG_USER | LOG_INFO; |
| const char* cp = buf; |
| if ((len > 0) && (*cp == '<')) { |
| pri = 0; |
| while (--len && isdigit(*++cp)) { |
| pri = (pri * 10) + *cp - '0'; |
| } |
| if ((len > 0) && (*cp == '>')) { |
| ++cp; |
| } else { |
| cp = buf; |
| pri = LOG_USER | LOG_INFO; |
| } |
| buf = cp; |
| } |
| return pri; |
| } |
| |
| // Passed the entire SYSLOG_ACTION_READ_ALL buffer and interpret a |
| // compensated start time. |
| void LogKlog::synchronize(const char* buf, ssize_t len) { |
| const char* cp = android::strnstr(buf, len, suspendStr); |
| if (!cp) { |
| cp = android::strnstr(buf, len, resumeStr); |
| if (!cp) return; |
| } else { |
| const char* rp = android::strnstr(buf, len, resumeStr); |
| if (rp && (rp < cp)) cp = rp; |
| } |
| |
| do { |
| --cp; |
| } while ((cp > buf) && (*cp != '\n')); |
| if (*cp == '\n') { |
| ++cp; |
| } |
| parseKernelPrio(cp, len - (cp - buf)); |
| |
| log_time now; |
| sniffTime(now, cp, len - (cp - buf), true); |
| |
| const char* suspended = android::strnstr(buf, len, suspendedStr); |
| if (!suspended || (suspended > cp)) { |
| return; |
| } |
| cp = suspended; |
| |
| do { |
| --cp; |
| } while ((cp > buf) && (*cp != '\n')); |
| if (*cp == '\n') { |
| ++cp; |
| } |
| parseKernelPrio(cp, len - (cp - buf)); |
| |
| sniffTime(now, cp, len - (cp - buf), true); |
| } |
| |
| // Convert kernel log priority number into an Android Logger priority number |
| static int convertKernelPrioToAndroidPrio(int pri) { |
| switch (pri & LOG_PRIMASK) { |
| case LOG_EMERG: |
| // FALLTHRU |
| case LOG_ALERT: |
| // FALLTHRU |
| case LOG_CRIT: |
| return ANDROID_LOG_FATAL; |
| |
| case LOG_ERR: |
| return ANDROID_LOG_ERROR; |
| |
| case LOG_WARNING: |
| return ANDROID_LOG_WARN; |
| |
| default: |
| // FALLTHRU |
| case LOG_NOTICE: |
| // FALLTHRU |
| case LOG_INFO: |
| break; |
| |
| case LOG_DEBUG: |
| return ANDROID_LOG_DEBUG; |
| } |
| |
| return ANDROID_LOG_INFO; |
| } |
| |
| static const char* strnrchr(const char* s, ssize_t len, char c) { |
| const char* save = nullptr; |
| for (; len > 0; ++s, len--) { |
| if (*s == c) { |
| save = s; |
| } |
| } |
| return save; |
| } |
| |
| // |
| // log a message into the kernel log buffer |
| // |
| // Filter rules to parse <PRI> <TIME> <tag> and <message> in order for |
| // them to appear correct in the logcat output: |
| // |
| // LOG_KERN (0): |
| // <PRI>[<TIME>] <tag> ":" <message> |
| // <PRI>[<TIME>] <tag> <tag> ":" <message> |
| // <PRI>[<TIME>] <tag> <tag>_work ":" <message> |
| // <PRI>[<TIME>] <tag> '<tag>.<num>' ":" <message> |
| // <PRI>[<TIME>] <tag> '<tag><num>' ":" <message> |
| // <PRI>[<TIME>] <tag>_host '<tag>.<num>' ":" <message> |
| // (unimplemented) <PRI>[<TIME>] <tag> '<num>.<tag>' ":" <message> |
| // <PRI>[<TIME>] "[INFO]"<tag> : <message> |
| // <PRI>[<TIME>] "------------[ cut here ]------------" (?) |
| // <PRI>[<TIME>] "---[ end trace 3225a3070ca3e4ac ]---" (?) |
| // LOG_USER, LOG_MAIL, LOG_DAEMON, LOG_AUTH, LOG_SYSLOG, LOG_LPR, LOG_NEWS |
| // LOG_UUCP, LOG_CRON, LOG_AUTHPRIV, LOG_FTP: |
| // <PRI+TAG>[<TIME>] (see sys/syslog.h) |
| // Observe: |
| // Minimum tag length = 3 NB: drops things like r5:c00bbadf, but allow PM: |
| // Maximum tag words = 2 |
| // Maximum tag length = 16 NB: we are thinking of how ugly logcat can get. |
| // Not a Tag if there is no message content. |
| // leading additional spaces means no tag, inherit last tag. |
| // Not a Tag if <tag>: is "ERROR:", "WARNING:", "INFO:" or "CPU:" |
| // Drop: |
| // empty messages |
| // messages with ' audit(' in them if auditd is running |
| // logd.klogd: |
| // return -1 if message logd.klogd: <signature> |
| // |
| int LogKlog::log(const char* buf, ssize_t len) { |
| if (auditd && android::strnstr(buf, len, auditStr)) { |
| return 0; |
| } |
| |
| const char* p = buf; |
| int pri = parseKernelPrio(p, len); |
| |
| log_time now; |
| sniffTime(now, p, len - (p - buf), false); |
| |
| // sniff for start marker |
| const char* start = android::strnstr(p, len - (p - buf), klogdStr); |
| if (start) { |
| uint64_t sig = strtoll(start + strlen(klogdStr), nullptr, 10); |
| if (sig == signature.nsec()) { |
| if (initialized) { |
| enableLogging = true; |
| } else { |
| enableLogging = false; |
| } |
| return -1; |
| } |
| return 0; |
| } |
| |
| if (!enableLogging) { |
| return 0; |
| } |
| |
| // Parse pid, tid and uid |
| const pid_t pid = sniffPid(p, len - (p - buf)); |
| const pid_t tid = pid; |
| uid_t uid = AID_ROOT; |
| if (pid) { |
| logbuf->wrlock(); |
| uid = logbuf->pidToUid(pid); |
| logbuf->unlock(); |
| } |
| |
| // Parse (rules at top) to pull out a tag from the incoming kernel message. |
| // Some may view the following as an ugly heuristic, the desire is to |
| // beautify the kernel logs into an Android Logging format; the goal is |
| // admirable but costly. |
| while ((p < &buf[len]) && (isspace(*p) || !*p)) { |
| ++p; |
| } |
| if (p >= &buf[len]) { // timestamp, no content |
| return 0; |
| } |
| start = p; |
| const char* tag = ""; |
| const char* etag = tag; |
| ssize_t taglen = len - (p - buf); |
| const char* bt = p; |
| |
| static const char infoBrace[] = "[INFO]"; |
| static const ssize_t infoBraceLen = strlen(infoBrace); |
| if ((taglen >= infoBraceLen) && |
| !fastcmp<strncmp>(p, infoBrace, infoBraceLen)) { |
| // <PRI>[<TIME>] "[INFO]"<tag> ":" message |
| bt = p + infoBraceLen; |
| taglen -= infoBraceLen; |
| } |
| |
| const char* et; |
| for (et = bt; (taglen > 0) && *et && (*et != ':') && !isspace(*et); |
| ++et, --taglen) { |
| // skip ':' within [ ... ] |
| if (*et == '[') { |
| while ((taglen > 0) && *et && *et != ']') { |
| ++et; |
| --taglen; |
| } |
| if (taglen <= 0) { |
| break; |
| } |
| } |
| } |
| const char* cp; |
| for (cp = et; (taglen > 0) && isspace(*cp); ++cp, --taglen) { |
| } |
| |
| // Validate tag |
| ssize_t size = et - bt; |
| if ((taglen > 0) && (size > 0)) { |
| if (*cp == ':') { |
| // ToDo: handle case insensitive colon separated logging stutter: |
| // <tag> : <tag>: ... |
| |
| // One Word |
| tag = bt; |
| etag = et; |
| p = cp + 1; |
| } else if ((taglen > size) && (tolower(*bt) == tolower(*cp))) { |
| // clean up any tag stutter |
| if (!fastcmp<strncasecmp>(bt + 1, cp + 1, size - 1)) { // no match |
| // <PRI>[<TIME>] <tag> <tag> : message |
| // <PRI>[<TIME>] <tag> <tag>: message |
| // <PRI>[<TIME>] <tag> '<tag>.<num>' : message |
| // <PRI>[<TIME>] <tag> '<tag><num>' : message |
| // <PRI>[<TIME>] <tag> '<tag><stuff>' : message |
| const char* b = cp; |
| cp += size; |
| taglen -= size; |
| while ((--taglen > 0) && !isspace(*++cp) && (*cp != ':')) { |
| } |
| const char* e; |
| for (e = cp; (taglen > 0) && isspace(*cp); ++cp, --taglen) { |
| } |
| if ((taglen > 0) && (*cp == ':')) { |
| tag = b; |
| etag = e; |
| p = cp + 1; |
| } |
| } else { |
| // what about <PRI>[<TIME>] <tag>_host '<tag><stuff>' : message |
| static const char host[] = "_host"; |
| static const ssize_t hostlen = strlen(host); |
| if ((size > hostlen) && |
| !fastcmp<strncmp>(bt + size - hostlen, host, hostlen) && |
| !fastcmp<strncmp>(bt + 1, cp + 1, size - hostlen - 1)) { |
| const char* b = cp; |
| cp += size - hostlen; |
| taglen -= size - hostlen; |
| if (*cp == '.') { |
| while ((--taglen > 0) && !isspace(*++cp) && |
| (*cp != ':')) { |
| } |
| const char* e; |
| for (e = cp; (taglen > 0) && isspace(*cp); |
| ++cp, --taglen) { |
| } |
| if ((taglen > 0) && (*cp == ':')) { |
| tag = b; |
| etag = e; |
| p = cp + 1; |
| } |
| } |
| } else { |
| goto twoWord; |
| } |
| } |
| } else { |
| // <PRI>[<TIME>] <tag> <stuff>' : message |
| twoWord: |
| while ((--taglen > 0) && !isspace(*++cp) && (*cp != ':')) { |
| } |
| const char* e; |
| for (e = cp; (taglen > 0) && isspace(*cp); ++cp, --taglen) { |
| } |
| // Two words |
| if ((taglen > 0) && (*cp == ':')) { |
| tag = bt; |
| etag = e; |
| p = cp + 1; |
| } |
| } |
| } // else no tag |
| |
| static const char cpu[] = "CPU"; |
| static const ssize_t cpuLen = strlen(cpu); |
| static const char warning[] = "WARNING"; |
| static const ssize_t warningLen = strlen(warning); |
| static const char error[] = "ERROR"; |
| static const ssize_t errorLen = strlen(error); |
| static const char info[] = "INFO"; |
| static const ssize_t infoLen = strlen(info); |
| |
| size = etag - tag; |
| if ((size <= 1) || |
| // register names like x9 |
| ((size == 2) && (isdigit(tag[0]) || isdigit(tag[1]))) || |
| // register names like x18 but not driver names like en0 |
| ((size == 3) && (isdigit(tag[1]) && isdigit(tag[2]))) || |
| // blacklist |
| ((size == cpuLen) && !fastcmp<strncmp>(tag, cpu, cpuLen)) || |
| ((size == warningLen) && |
| !fastcmp<strncasecmp>(tag, warning, warningLen)) || |
| ((size == errorLen) && !fastcmp<strncasecmp>(tag, error, errorLen)) || |
| ((size == infoLen) && !fastcmp<strncasecmp>(tag, info, infoLen))) { |
| p = start; |
| etag = tag = ""; |
| } |
| |
| // Suppress additional stutter in tag: |
| // eg: [143:healthd]healthd -> [143:healthd] |
| taglen = etag - tag; |
| // Mediatek-special printk induced stutter |
| const char* mp = strnrchr(tag, taglen, ']'); |
| if (mp && (++mp < etag)) { |
| ssize_t s = etag - mp; |
| if (((s + s) < taglen) && !fastcmp<memcmp>(mp, mp - 1 - s, s)) { |
| taglen = mp - tag; |
| } |
| } |
| // Deal with sloppy and simplistic harmless p = cp + 1 etc above. |
| if (len < (p - buf)) { |
| p = &buf[len]; |
| } |
| // skip leading space |
| while ((p < &buf[len]) && (isspace(*p) || !*p)) { |
| ++p; |
| } |
| // truncate trailing space or nuls |
| ssize_t b = len - (p - buf); |
| while ((b > 0) && (isspace(p[b - 1]) || !p[b - 1])) { |
| --b; |
| } |
| // trick ... allow tag with empty content to be logged. log() drops empty |
| if ((b <= 0) && (taglen > 0)) { |
| p = " "; |
| b = 1; |
| } |
| // paranoid sanity check, can not happen ... |
| if (b > LOGGER_ENTRY_MAX_PAYLOAD) { |
| b = LOGGER_ENTRY_MAX_PAYLOAD; |
| } |
| if (taglen > LOGGER_ENTRY_MAX_PAYLOAD) { |
| taglen = LOGGER_ENTRY_MAX_PAYLOAD; |
| } |
| // calculate buffer copy requirements |
| ssize_t n = 1 + taglen + 1 + b + 1; |
| // paranoid sanity check, first two just can not happen ... |
| if ((taglen > n) || (b > n) || (n > (ssize_t)USHRT_MAX) || (n <= 0)) { |
| return -EINVAL; |
| } |
| |
| // Careful. |
| // We are using the stack to house the log buffer for speed reasons. |
| // If we malloc'd this buffer, we could get away without n's USHRT_MAX |
| // test above, but we would then required a max(n, USHRT_MAX) as |
| // truncating length argument to logbuf->log() below. Gain is protection |
| // of stack sanity and speedup, loss is truncated long-line content. |
| char newstr[n]; |
| char* np = newstr; |
| |
| // Convert priority into single-byte Android logger priority |
| *np = convertKernelPrioToAndroidPrio(pri); |
| ++np; |
| |
| // Copy parsed tag following priority |
| memcpy(np, tag, taglen); |
| np += taglen; |
| *np = '\0'; |
| ++np; |
| |
| // Copy main message to the remainder |
| memcpy(np, p, b); |
| np[b] = '\0'; |
| |
| if (!isMonotonic()) { |
| // Watch out for singular race conditions with timezone causing near |
| // integer quarter-hour jumps in the time and compensate accordingly. |
| // Entries will be temporal within near_seconds * 2. b/21868540 |
| static uint32_t vote_time[3]; |
| vote_time[2] = vote_time[1]; |
| vote_time[1] = vote_time[0]; |
| vote_time[0] = now.tv_sec; |
| |
| if (vote_time[1] && vote_time[2]) { |
| static const unsigned near_seconds = 10; |
| static const unsigned timezones_seconds = 900; |
| int diff0 = (vote_time[0] - vote_time[1]) / near_seconds; |
| unsigned abs0 = (diff0 < 0) ? -diff0 : diff0; |
| int diff1 = (vote_time[1] - vote_time[2]) / near_seconds; |
| unsigned abs1 = (diff1 < 0) ? -diff1 : diff1; |
| if ((abs1 <= 1) && // last two were in agreement on timezone |
| ((abs0 + 1) % (timezones_seconds / near_seconds)) <= 2) { |
| abs0 = (abs0 + 1) / (timezones_seconds / near_seconds) * |
| timezones_seconds; |
| now.tv_sec -= (diff0 < 0) ? -abs0 : abs0; |
| } |
| } |
| } |
| |
| // Log message |
| int rc = logbuf->log(LOG_ID_KERNEL, now, uid, pid, tid, newstr, |
| (unsigned short)n); |
| |
| // notify readers |
| if (rc > 0) { |
| reader->notifyNewLog(static_cast<log_mask_t>(1 << LOG_ID_KERNEL)); |
| } |
| |
| return rc; |
| } |
