diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/stdout-syslog-bridge.c | 706 |
1 files changed, 0 insertions, 706 deletions
diff --git a/src/stdout-syslog-bridge.c b/src/stdout-syslog-bridge.c deleted file mode 100644 index e82716a1bd..0000000000 --- a/src/stdout-syslog-bridge.c +++ /dev/null @@ -1,706 +0,0 @@ -/*-*- 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 <systemd/sd-daemon.h> - -#include "util.h" -#include "log.h" -#include "list.h" -#include "tcpwrap.h" -#include "def.h" - -#define STREAMS_MAX 4096 -#define SERVER_FD_MAX 16 -#define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC)) - -typedef struct Stream Stream; - -typedef struct Server { - int syslog_fd; - int kmsg_fd; - int epoll_fd; - - unsigned n_server_fd; - - bool syslog_is_stream; - - LIST_HEAD(Stream, streams); - unsigned n_streams; -} Server; - -typedef enum StreamTarget { - STREAM_SYSLOG, - STREAM_KMSG -} StreamTarget; - -typedef enum StreamState { - STREAM_TARGET, - STREAM_PRIORITY, - STREAM_PROCESS, - STREAM_PREFIX, - STREAM_RUNNING -} StreamState; - -struct Stream { - Server *server; - - StreamState state; - - int fd; - - StreamTarget target; - int priority; - char *process; - pid_t pid; - uid_t uid; - gid_t gid; - - bool prefix:1; - bool tee_console:1; - - char buffer[LINE_MAX+1]; - size_t length; - - LIST_FIELDS(Stream, stream); -}; - -static int stream_log(Stream *s, char *p, usec_t ts) { - - char header_priority[16], header_time[64], header_pid[16]; - struct iovec iovec[5]; - int priority; - - assert(s); - assert(p); - - priority = s->priority; - - if (s->prefix) - parse_syslog_priority(&p, &priority); - - if (*p == 0) - return 0; - - /* Patch in configured facility if necessary */ - if ((priority & LOG_FACMASK) == 0) - priority = (s->priority & LOG_FACMASK) | priority; - - /* - * The format glibc uses to talk to the syslog daemon is: - * - * <priority>time process[pid]: msg - * - * The format the kernel uses is: - * - * <priority>msg\n - * - * We extend the latter to include the process name and pid. - */ - - snprintf(header_priority, sizeof(header_priority), "<%i>", priority); - char_array_0(header_priority); - - if (s->target == STREAM_SYSLOG) { - time_t t; - struct tm *tm; - - t = (time_t) (ts / USEC_PER_SEC); - if (!(tm = localtime(&t))) - return -EINVAL; - - if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0) - return -EINVAL; - } - - snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) s->pid); - char_array_0(header_pid); - - zero(iovec); - IOVEC_SET_STRING(iovec[0], header_priority); - - if (s->target == STREAM_SYSLOG) { - struct msghdr msghdr; - union { - struct cmsghdr cmsghdr; - uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; - } control; - struct ucred *ucred; - - zero(control); - 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); - ucred->pid = s->pid; - ucred->uid = s->uid; - ucred->gid = s->gid; - - IOVEC_SET_STRING(iovec[1], header_time); - IOVEC_SET_STRING(iovec[2], s->process); - IOVEC_SET_STRING(iovec[3], header_pid); - IOVEC_SET_STRING(iovec[4], p); - - /* When using syslog via SOCK_STREAM separate the messages by NUL chars */ - if (s->server->syslog_is_stream) - iovec[4].iov_len++; - - zero(msghdr); - msghdr.msg_iov = iovec; - msghdr.msg_iovlen = ELEMENTSOF(iovec); - msghdr.msg_control = &control; - msghdr.msg_controllen = control.cmsghdr.cmsg_len; - - for (;;) { - ssize_t n; - - if ((n = sendmsg(s->server->syslog_fd, &msghdr, MSG_NOSIGNAL)) < 0) { - - if (errno == ESRCH) { - pid_t our_pid; - - /* Hmm, maybe the process this - * line originates from is - * dead? Then let's patch in - * our own pid and retry, - * since we have nothing - * better */ - - our_pid = getpid(); - - if (ucred->pid != our_pid) { - ucred->pid = our_pid; - continue; - } - } - - return -errno; - } - - if (!s->server->syslog_is_stream || - (size_t) n >= IOVEC_TOTAL_SIZE(iovec, ELEMENTSOF(iovec))) - break; - - IOVEC_INCREMENT(iovec, ELEMENTSOF(iovec), n); - } - - } else if (s->target == STREAM_KMSG) { - IOVEC_SET_STRING(iovec[1], s->process); - IOVEC_SET_STRING(iovec[2], header_pid); - IOVEC_SET_STRING(iovec[3], p); - IOVEC_SET_STRING(iovec[4], (char*) "\n"); - - if (writev(s->server->kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0) - return -errno; - } else - assert_not_reached("Unknown log target"); - - if (s->tee_console) { - int console; - - if ((console = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) >= 0) { - IOVEC_SET_STRING(iovec[0], s->process); - IOVEC_SET_STRING(iovec[1], header_pid); - IOVEC_SET_STRING(iovec[2], p); - IOVEC_SET_STRING(iovec[3], (char*) "\n"); - - writev(console, iovec, 4); - } - } - - return 0; -} - -static int stream_line(Stream *s, char *p, usec_t ts) { - int r; - - assert(s); - assert(p); - - p = strstrip(p); - - switch (s->state) { - - case STREAM_TARGET: - if (streq(p, "syslog") || streq(p, "syslog+console")) - s->target = STREAM_SYSLOG; - else if (streq(p, "kmsg") || streq(p, "kmsg+console")) { - - if (s->server->kmsg_fd >= 0 && s->uid == 0) - s->target = STREAM_KMSG; - else { - log_warning("/dev/kmsg logging not available."); - return -EPERM; - } - } else { - log_warning("Failed to parse log target line."); - return -EBADMSG; - } - - if (endswith(p, "+console")) - s->tee_console = true; - - s->state = STREAM_PRIORITY; - return 0; - - case STREAM_PRIORITY: - if ((r = safe_atoi(p, &s->priority)) < 0) { - log_warning("Failed to parse log priority line: %m"); - return r; - } - - if (s->priority < 0) { - log_warning("Log priority negative: %m"); - return -ERANGE; - } - - s->state = STREAM_PROCESS; - return 0; - - case STREAM_PROCESS: - if (!(s->process = strdup(p))) - return -ENOMEM; - - s->state = STREAM_PREFIX; - return 0; - - case STREAM_PREFIX: - - if ((r = parse_boolean(p)) < 0) - return r; - - s->prefix = r; - s->state = STREAM_RUNNING; - return 0; - - case STREAM_RUNNING: - return stream_log(s, p, ts); - } - - assert_not_reached("Unknown stream state"); -} - -static int stream_scan(Stream *s, usec_t ts) { - char *p; - size_t remaining; - int r = 0; - - assert(s); - - p = s->buffer; - remaining = s->length; - for (;;) { - char *end; - size_t skip; - - end = memchr(p, '\n', remaining); - if (!end) { - if (remaining >= LINE_MAX) { - end = p + LINE_MAX; - skip = LINE_MAX; - } else - break; - } else - skip = end - p + 1; - - *end = 0; - - r = stream_line(s, p, ts); - if (r >= 0) { - remaining -= skip; - p += skip; - } - } - - if (p > s->buffer) { - memmove(s->buffer, p, remaining); - s->length = remaining; - } - - return r; -} - -static int stream_process(Stream *s, usec_t ts) { - ssize_t l; - int r; - assert(s); - - l = read(s->fd, s->buffer+s->length, LINE_MAX-s->length); - if (l < 0) { - - if (errno == EAGAIN) - return 0; - - log_warning("Failed to read from stream: %m"); - return -errno; - } - - if (l == 0) - return 0; - - s->length += l; - r = stream_scan(s, ts); - - if (r < 0) - return r; - - return 1; -} - -static void stream_free(Stream *s) { - assert(s); - - if (s->server) { - assert(s->server->n_streams > 0); - s->server->n_streams--; - LIST_REMOVE(Stream, stream, s->server->streams, s); - - } - - if (s->fd >= 0) { - if (s->server) - epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL); - - close_nointr_nofail(s->fd); - } - - free(s->process); - free(s); -} - -static int stream_new(Server *s, int server_fd) { - Stream *stream; - int fd; - struct ucred ucred; - socklen_t len = sizeof(ucred); - struct epoll_event ev; - int r; - - assert(s); - assert(server_fd >= 0); - - fd = accept4(server_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); - if (fd < 0) - return -errno; - - if (s->n_streams >= STREAMS_MAX) { - log_warning("Too many connections, refusing connection."); - close_nointr_nofail(fd); - return 0; - } - - if (!socket_tcpwrap(fd, "systemd-stdout-syslog-bridge")) { - close_nointr_nofail(fd); - return 0; - } - - if (!(stream = new0(Stream, 1))) { - close_nointr_nofail(fd); - return -ENOMEM; - } - - stream->fd = fd; - - if (getsockopt(stream->fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len) < 0) { - r = -errno; - goto fail; - } - - if (shutdown(fd, SHUT_WR) < 0) { - r = -errno; - goto fail; - } - - zero(ev); - ev.data.ptr = stream; - ev.events = EPOLLIN; - if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { - r = -errno; - goto fail; - } - - stream->pid = ucred.pid; - stream->uid = ucred.uid; - stream->gid = ucred.gid; - - stream->server = s; - LIST_PREPEND(Stream, stream, s->streams, stream); - s->n_streams ++; - - return 0; - -fail: - stream_free(stream); - return r; -} - -static void server_done(Server *s) { - unsigned i; - assert(s); - - while (s->streams) - stream_free(s->streams); - - for (i = 0; i < s->n_server_fd; i++) - close_nointr_nofail(SD_LISTEN_FDS_START+i); - - if (s->syslog_fd >= 0) - close_nointr_nofail(s->syslog_fd); - - if (s->epoll_fd >= 0) - close_nointr_nofail(s->epoll_fd); - - if (s->kmsg_fd >= 0) - close_nointr_nofail(s->kmsg_fd); -} - -static int server_init(Server *s, unsigned n_sockets) { - int r; - unsigned i; - union { - struct sockaddr sa; - struct sockaddr_un un; - } sa; - - assert(s); - assert(n_sockets > 0); - - zero(*s); - - s->n_server_fd = n_sockets; - s->syslog_fd = -1; - s->kmsg_fd = -1; - - if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) { - r = -errno; - log_error("Failed to create epoll object: %m"); - goto fail; - } - - for (i = 0; i < n_sockets; i++) { - struct epoll_event ev; - int fd; - - fd = SD_LISTEN_FDS_START+i; - - if ((r = sd_is_socket(fd, AF_UNSPEC, SOCK_STREAM, 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; - } - - /* We use ev.data.ptr instead of ev.data.fd here, - * since on 64bit archs fd is 32bit while a pointer is - * 64bit. To make sure we can easily distinguish fd - * values and pointer values we want to make sure to - * write the full field unconditionally. */ - - zero(ev); - ev.events = EPOLLIN; - ev.data.ptr = INT_TO_PTR(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: %m"); - goto fail; - } - } - - zero(sa); - sa.un.sun_family = AF_UNIX; - strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path)); - - if ((s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) { - r = -errno; - log_error("Failed to create log fd: %m"); - goto fail; - } - - if (connect(s->syslog_fd, &sa.sa, sizeof(sa)) < 0) { - close_nointr_nofail(s->syslog_fd); - - if ((s->syslog_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0)) < 0) { - r = -errno; - log_error("Failed to create log fd: %m"); - goto fail; - } - - if (connect(s->syslog_fd, &sa.sa, sizeof(sa)) < 0) { - r = -errno; - log_error("Failed to connect log socket to /dev/log: %m"); - goto fail; - } - - s->syslog_is_stream = true; - } else - s->syslog_is_stream = false; - - /* /dev/kmsg logging is strictly optional */ - if ((s->kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) - log_warning("Failed to open /dev/kmsg for logging, disabling kernel log buffer support: %m"); - - return 0; - -fail: - server_done(s); - return r; -} - -static int process_event(Server *s, struct epoll_event *ev) { - int r; - - assert(s); - - /* Yes, this is a bit ugly, we assume that that valid pointers - * are > SD_LISTEN_FDS_START+SERVER_FD_MAX. Which is certainly - * true on Linux (and probably most other OSes, too, since the - * first 4k usually are part of a separate null pointer - * dereference page. */ - - if (PTR_TO_INT(ev->data.ptr) >= SD_LISTEN_FDS_START && - PTR_TO_INT(ev->data.ptr) < SD_LISTEN_FDS_START+(int)s->n_server_fd) { - - if (ev->events != EPOLLIN) { - log_info("Got invalid event from epoll. (1)"); - return -EIO; - } - - if ((r = stream_new(s, PTR_TO_INT(ev->data.ptr))) < 0) { - log_info("Failed to accept new connection: %s", strerror(-r)); - return r; - } - - } else { - usec_t ts; - Stream *stream = ev->data.ptr; - - ts = now(CLOCK_REALTIME); - - if (!(ev->events & EPOLLIN)) { - log_info("Got invalid event from epoll. (2)"); - stream_free(stream); - return 0; - } - - if ((r = stream_process(stream, ts)) <= 0) { - - if (r < 0) - log_info("Got error on stream: %s", strerror(-r)); - - stream_free(stream); - return 0; - } - } - - return 0; -} - -int main(int argc, char *argv[]) { - Server server; - int r = EXIT_FAILURE, n; - - if (getppid() != 1) { - log_error("This program should be invoked by init only."); - return EXIT_FAILURE; - } - - if (argc > 1) { - log_error("This program does not take arguments."); - return EXIT_FAILURE; - } - - log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); - log_parse_environment(); - log_open(); - - umask(0022); - - n = sd_listen_fds(true); - if (n < 0) { - log_error("Failed to read listening file descriptors from environment: %s", strerror(-r)); - return EXIT_FAILURE; - } - - if (n <= 0 || n > SERVER_FD_MAX) { - log_error("No or too many file descriptors passed."); - return EXIT_FAILURE; - } - - if (server_init(&server, (unsigned) n) < 0) - return EXIT_FAILURE; - - log_debug("systemd-stdout-syslog-bridge running as pid %lu", (unsigned long) getpid()); - - sd_notify(false, - "READY=1\n" - "STATUS=Processing requests..."); - - for (;;) { - struct epoll_event event; - int k; - - if ((k = epoll_wait(server.epoll_fd, - &event, 1, - server.n_streams <= 0 ? TIMEOUT_MSEC : -1)) < 0) { - - if (errno == EINTR) - continue; - - log_error("epoll_wait() failed: %m"); - goto fail; - } - - if (k <= 0) - break; - - if (process_event(&server, &event) < 0) - goto fail; - } - - r = EXIT_SUCCESS; - - log_debug("systemd-stdout-syslog-bridge stopped as pid %lu", (unsigned long) getpid()); - -fail: - sd_notify(false, - "STATUS=Shutting down..."); - - server_done(&server); - - return r; -} |