diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/fdset.c | 2 | ||||
| -rw-r--r-- | src/kmsg-syslogd.c | 545 | ||||
| -rw-r--r-- | src/log.c | 5 | ||||
| -rw-r--r-- | src/logger.c | 7 |
4 files changed, 551 insertions, 8 deletions
diff --git a/src/fdset.c b/src/fdset.c index b482f0b244..29e75a0346 100644 --- a/src/fdset.c +++ b/src/fdset.c @@ -49,7 +49,7 @@ void fdset_free(FDSet *s) { * here, so that the EBADFD that valgrind will return * us on close() doesn't influence us */ - log_warning("Closing left-over fd %i", PTR_TO_FD(p)); + /* log_warning("Closing left-over fd %i", PTR_TO_FD(p)); */ close_nointr(PTR_TO_FD(p)); } diff --git a/src/kmsg-syslogd.c b/src/kmsg-syslogd.c new file mode 100644 index 0000000000..f5c8e7121d --- /dev/null +++ b/src/kmsg-syslogd.c @@ -0,0 +1,545 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <sys/socket.h> +#include <sys/types.h> +#include <assert.h> +#include <time.h> +#include <string.h> +#include <stdio.h> +#include <errno.h> +#include <unistd.h> +#include <sys/poll.h> +#include <sys/epoll.h> +#include <sys/un.h> +#include <fcntl.h> +#include <sys/signalfd.h> + +#include "util.h" +#include "log.h" +#include "sd-daemon.h" +#include "fdset.h" + +#define SERVER_FD_MAX 16 +#define TIMEOUT ((int) (10*MSEC_PER_SEC)) + +typedef struct Stream Stream; + +typedef struct Server { + FDSet *syslog_fds; + int kmsg_fd; + int epoll_fd; + int signal_fd; +} Server; + +static void server_done(Server *s) { + assert(s); + + if (s->epoll_fd >= 0) + close_nointr_nofail(s->epoll_fd); + + if (s->kmsg_fd >= 0) + close_nointr_nofail(s->kmsg_fd); + + if (s->signal_fd >= 0) + close_nointr_nofail(s->signal_fd); + + if (s->syslog_fds) + fdset_free(s->syslog_fds); +} + +static int server_init(Server *s, unsigned n_sockets) { + int r; + unsigned i; + struct epoll_event ev; + sigset_t mask; + + assert(s); + assert(n_sockets > 0); + + zero(*s); + + s->kmsg_fd = s->signal_fd = -1; + + if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) { + r = -errno; + log_error("Failed to create epoll object: %s", strerror(errno)); + goto fail; + } + + if (!(s->syslog_fds = fdset_new())) { + r = -ENOMEM; + log_error("Failed to allocate file descriptor set: %s", strerror(errno)); + goto fail; + } + + for (i = 0; i < n_sockets; i++) { + int fd, one = 1; + + fd = SD_LISTEN_FDS_START+i; + + if ((r = sd_is_socket(fd, AF_UNSPEC, SOCK_DGRAM, -1)) < 0) { + log_error("Failed to determine file descriptor type: %s", strerror(-r)); + goto fail; + } + + if (!r) { + log_error("Wrong file descriptor type."); + r = -EINVAL; + goto fail; + } + + if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) + log_error("SO_PASSCRED failed: %m"); + + zero(ev); + ev.events = EPOLLIN; + ev.data.fd = fd; + if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { + r = -errno; + log_error("Failed to add server fd to epoll object: %s", strerror(errno)); + goto fail; + } + + if ((r = fdset_put(s->syslog_fds, fd)) < 0) { + log_error("Failed to store file descriptor in set: %s", strerror(-r)); + goto fail; + } + } + + if ((s->kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) { + log_error("Failed to open /dev/kmsg for logging: %m"); + return -errno; + } + + assert_se(sigemptyset(&mask) == 0); + sigset_add_many(&mask, SIGINT, SIGTERM, -1); + assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); + + if ((s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) { + log_error("signalfd(): %m"); + return -errno; + } + + zero(ev); + ev.events = EPOLLIN; + ev.data.fd = s->signal_fd; + + if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) { + log_error("epoll_ctl(): %m"); + return -errno; + } + + return 0; + +fail: + server_done(s); + return r; +} + +static int read_priority(const char **buf) { + int priority; + size_t n; + const char *p; + int a, b, c; + + assert(buf); + assert(*buf); + + p = *buf; + n = strlen(p); + + if (n < 3 || p[0] != '<') + goto fail; + + if (p[2] == '>') { + a = b = 0; + c = undecchar(p[1]); + p += 3; + } else if (n >= 4 && p[3] == '>') { + a = 0; + b = undecchar(p[1]); + c = undecchar(p[2]); + p += 4; + } else if (n >= 5 && p[4] == '>') { + a = undecchar(p[1]); + b = undecchar(p[2]); + c = undecchar(p[3]); + p += 5; + } else + goto fail; + + if (a < 0 || b < 0 || c < 0) + goto fail; + + *buf = p; + + priority = 100*a + 10*b + c; + return LOG_PRI(priority); + +fail: + return LOG_INFO; +} + +static void skip_date(const char **buf) { + enum { + LETTER, + SPACE, + NUMBER, + SPACE_OR_NUMBER, + COLON + } sequence[] = { + LETTER, LETTER, LETTER, + SPACE, + SPACE_OR_NUMBER, NUMBER, + SPACE, + SPACE_OR_NUMBER, NUMBER, + COLON, + SPACE_OR_NUMBER, NUMBER, + COLON, + SPACE_OR_NUMBER, NUMBER, + SPACE + }; + + const char *p; + unsigned i; + + assert(buf); + assert(*buf); + + p = *buf; + + for (i = 0; i < ELEMENTSOF(sequence); i++, p++) { + + if (!*p) + return; + + switch (sequence[i]) { + + case SPACE: + if (*p != ' ') + return; + break; + + case SPACE_OR_NUMBER: + if (*p == ' ') + break; + + /* fall through */ + + case NUMBER: + if (*p < '0' || *p > '9') + return; + + break; + + case LETTER: + if (!(*p >= 'A' && *p <= 'Z') && + !(*p >= 'a' && *p <= 'z')) + return; + + break; + + case COLON: + if (*p != ':') + return; + break; + + } + } + + *buf = p; +} + +static int read_process(const char **buf, struct iovec *iovec) { + const char *p; + size_t l; + + assert(buf); + assert(*buf); + assert(iovec); + + p = *buf; + + p += strspn(p, WHITESPACE); + l = strcspn(p, WHITESPACE); + + if (l <= 0 || + p[l-1] != ':') + return 0; + + l--; + + if (p[l-1] == ']') { + size_t k = l-1; + + for (;;) { + + if (p[k] == '[') { + l = k; + break; + } + + if (k == 0) + break; + + k--; + } + } + + iovec->iov_base = (char*) p; + iovec->iov_len = l; + *buf = p + l; + return 1; +} + +static void skip_pid(const char **buf) { + const char *p; + + assert(buf); + assert(*buf); + + p = *buf; + + if (*p != '[') + return; + + p++; + p += strspn(p, "0123456789"); + + if (*p != ']') + return; + + p++; + + *buf = p; +} + +static int write_message(Server *s, const char *buf, struct ucred *ucred) { + ssize_t k; + char priority[4], pid[16]; + struct iovec iovec[5]; + unsigned i = 0; + char *process = NULL; + int r = 0; + + assert(s); + assert(buf); + + /* First, set priority field */ + snprintf(priority, sizeof(priority), "<%i>", read_priority(&buf)); + char_array_0(priority); + IOVEC_SET_STRING(iovec[i++], priority); + + /* Second, skip date */ + skip_date(&buf); + + /* Then, add process if set */ + if (read_process(&buf, &iovec[i]) > 0) + i++; + else if (ucred && get_process_name(ucred->pid, &process) >= 0) + IOVEC_SET_STRING(iovec[i++], process); + + /* Skip the stored PID if we have a better one */ + if (ucred) { + snprintf(pid, sizeof(pid), "[%lu]: ", (unsigned long) ucred->pid); + char_array_0(pid); + IOVEC_SET_STRING(iovec[i++], pid); + + skip_pid(&buf); + + if (*buf == ':') + buf++; + + buf += strspn(buf, WHITESPACE); + } + + /* Is the remaining message empty? */ + if (*buf) { + + /* And the rest is the message */ + IOVEC_SET_STRING(iovec[i++], buf); + IOVEC_SET_STRING(iovec[i++], "\n"); + + if ((k = writev(s->kmsg_fd, iovec, i)) <= 0) { + log_error("Failed to write log message to kmsg: %s", k < 0 ? strerror(errno) : "short write"); + r = k < 0 ? -errno : -EIO; + } + } + + free(process); + + return r; +} + +static int process_event(Server *s, struct epoll_event *ev) { + assert(s); + + if (ev->events != EPOLLIN) { + log_info("Got invalid event from epoll."); + return -EIO; + } + + if (ev->data.fd == s->signal_fd) { + struct signalfd_siginfo sfsi; + ssize_t n; + + if ((n = read(s->signal_fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) { + + if (n >= 0) + return -EIO; + + if (errno == EINTR || errno == EAGAIN) + return 0; + + return -errno; + } + + log_debug("Received SIG%s", strna(signal_to_string(sfsi.ssi_signo))); + return 0; + + } else { + for (;;) { + char buf[LINE_MAX+1]; + struct msghdr msghdr; + struct iovec iovec; + struct ucred *ucred; + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; + } control; + ssize_t n; + int k; + char *e; + + zero(iovec); + iovec.iov_base = buf; + iovec.iov_len = sizeof(buf)-1; + + zero(control); + zero(msghdr); + msghdr.msg_iov = &iovec; + msghdr.msg_iovlen = 1; + msghdr.msg_control = &control; + msghdr.msg_controllen = sizeof(control); + + if ((n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT)) < 0) { + + if (errno == EINTR || errno == EAGAIN) + return 1; + + log_error("recvmsg() failed: %m"); + return -errno; + } + + if (msghdr.msg_controllen >= CMSG_LEN(sizeof(struct ucred)) && + control.cmsghdr.cmsg_level == SOL_SOCKET && + control.cmsghdr.cmsg_type == SCM_CREDENTIALS && + control.cmsghdr.cmsg_len == CMSG_LEN(sizeof(struct ucred))) + ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr); + else + ucred = NULL; + + if ((e = memchr(buf, '\n', n))) + *e = 0; + else + buf[n] = 0; + + if ((k = write_message(s, strstrip(buf), ucred)) < 0) + return k; + } + } + + return 1; +} + +int main(int argc, char *argv[]) { + Server server; + int r = 3, n; + + if (getppid() != 1) { + log_error("This program should be invoked by init only."); + return 1; + } + + if (argc > 1) { + log_error("This program does not take arguments."); + return 1; + } + + log_set_target(LOG_TARGET_KMSG); + log_parse_environment(); + log_open(); + + if ((n = sd_listen_fds(true)) < 0) { + log_error("Failed to read listening file descriptors from environment: %s", strerror(-r)); + return 1; + } + + if (n <= 0 || n > SERVER_FD_MAX) { + log_error("No or too many file descriptors passed."); + return 2; + } + + if (server_init(&server, (unsigned) n) < 0) + return 3; + + log_debug("systemd-kmsg-syslogd running as pid %lu", (unsigned long) getpid()); + + sd_notify(false, + "READY=1\n" + "STATUS=Processing messages..."); + + for (;;) { + struct epoll_event event; + int k; + + if ((k = epoll_wait(server.epoll_fd, &event, 1, TIMEOUT)) < 0) { + + if (errno == EINTR) + continue; + + log_error("epoll_wait() failed: %m"); + goto fail; + } + + if (k <= 0) + break; + + if ((k = process_event(&server, &event)) < 0) + goto fail; + + if (k == 0) + break; + } + + r = 0; + + log_debug("systemd-kmsg-syslogd stopped as pid %lu", (unsigned long) getpid()); + +fail: + sd_notify(false, + "STATUS=Shutting down..."); + + server_done(&server); + + return r; +} @@ -32,7 +32,6 @@ #include "macro.h" #define SYSLOG_TIMEOUT_USEC (5*USEC_PER_SEC) -#define LOG_BUFFER_MAX 1024 static LogTarget log_target = LOG_TARGET_CONSOLE; static int log_max_level = LOG_INFO; @@ -417,7 +416,7 @@ int log_meta( const char *func, const char *format, ...) { - char buffer[LOG_BUFFER_MAX]; + char buffer[LINE_MAX]; int saved_errno, r; va_list ap; @@ -444,7 +443,7 @@ void log_assert( const char *func, const char *format, ...) { - static char buffer[LOG_BUFFER_MAX]; + static char buffer[LINE_MAX]; int saved_errno = errno; va_list ap; diff --git a/src/logger.c b/src/logger.c index 95d58fc1b3..5a28c2197f 100644 --- a/src/logger.c +++ b/src/logger.c @@ -38,7 +38,6 @@ #include "sd-daemon.h" #include "tcpwrap.h" -#define STREAM_BUFFER 2048 #define STREAMS_MAX 256 #define SERVER_FD_MAX 16 #define TIMEOUT ((int) (10*MSEC_PER_SEC)) @@ -85,7 +84,7 @@ struct Stream { bool prefix; - char buffer[STREAM_BUFFER]; + char buffer[LINE_MAX]; size_t length; LIST_FIELDS(Stream, stream); @@ -297,7 +296,7 @@ static int stream_process(Stream *s, usec_t ts) { int r; assert(s); - if ((l = read(s->fd, s->buffer+s->length, STREAM_BUFFER-s->length)) < 0) { + if ((l = read(s->fd, s->buffer+s->length, LINE_MAX-s->length)) < 0) { if (errno == EAGAIN) return 0; @@ -617,7 +616,7 @@ int main(int argc, char *argv[]) { r = 0; - log_info("systemd-logger stopped as pid %lu", (unsigned long) getpid()); + log_debug("systemd-logger stopped as pid %lu", (unsigned long) getpid()); fail: sd_notify(false, |