diff options
Diffstat (limited to 'src/journal')
| -rw-r--r-- | src/journal/journald-kmsg.c | 437 | ||||
| -rw-r--r-- | src/journal/journald-kmsg.h | 32 | ||||
| -rw-r--r-- | src/journal/journald.c | 475 | ||||
| -rw-r--r-- | src/journal/journald.h | 11 |
4 files changed, 517 insertions, 438 deletions
diff --git a/src/journal/journald-kmsg.c b/src/journal/journald-kmsg.c new file mode 100644 index 0000000000..cc0080da19 --- /dev/null +++ b/src/journal/journald-kmsg.c @@ -0,0 +1,437 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2011 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <unistd.h> +#include <sys/epoll.h> +#include <fcntl.h> +#include <sys/mman.h> + +#include <systemd/sd-messages.h> +#include <libudev.h> + +#include "journald.h" +#include "journald-kmsg.h" + +void server_forward_kmsg( + Server *s, + int priority, + const char *identifier, + const char *message, + struct ucred *ucred) { + + struct iovec iovec[5]; + char header_priority[6], header_pid[16]; + int n = 0; + char *ident_buf = NULL; + + assert(s); + assert(priority >= 0); + assert(priority <= 999); + assert(message); + + if (_unlikely_(LOG_PRI(priority) > s->max_level_kmsg)) + return; + + if (_unlikely_(s->dev_kmsg_fd < 0)) + return; + + /* Never allow messages with kernel facility to be written to + * kmsg, regardless where the data comes from. */ + priority = syslog_fixup_facility(priority); + + /* First: priority field */ + snprintf(header_priority, sizeof(header_priority), "<%i>", priority); + char_array_0(header_priority); + IOVEC_SET_STRING(iovec[n++], header_priority); + + /* Second: identifier and PID */ + if (ucred) { + if (!identifier) { + get_process_comm(ucred->pid, &ident_buf); + identifier = ident_buf; + } + + snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid); + char_array_0(header_pid); + + if (identifier) + IOVEC_SET_STRING(iovec[n++], identifier); + + IOVEC_SET_STRING(iovec[n++], header_pid); + } else if (identifier) { + IOVEC_SET_STRING(iovec[n++], identifier); + IOVEC_SET_STRING(iovec[n++], ": "); + } + + /* Fourth: message */ + IOVEC_SET_STRING(iovec[n++], message); + IOVEC_SET_STRING(iovec[n++], "\n"); + + if (writev(s->dev_kmsg_fd, iovec, n) < 0) + log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno)); + + free(ident_buf); +} + +static bool is_us(const char *pid) { + pid_t t; + + assert(pid); + + if (parse_pid(pid, &t) < 0) + return false; + + return t == getpid(); +} + +static void dev_kmsg_record(Server *s, char *p, size_t l) { + struct iovec iovec[N_IOVEC_META_FIELDS + 7 + N_IOVEC_KERNEL_FIELDS + 2 + N_IOVEC_UDEV_FIELDS]; + char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL; + int priority, r; + unsigned n = 0, z = 0, j; + usec_t usec; + char *identifier = NULL, *pid = NULL, *e, *f, *k; + uint64_t serial; + size_t pl; + char *kernel_device = NULL; + + assert(s); + assert(p); + + if (l <= 0) + return; + + e = memchr(p, ',', l); + if (!e) + return; + *e = 0; + + r = safe_atoi(p, &priority); + if (r < 0 || priority < 0 || priority > 999) + return; + + if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN) + return; + + l -= (e - p) + 1; + p = e + 1; + e = memchr(p, ',', l); + if (!e) + return; + *e = 0; + + r = safe_atou64(p, &serial); + if (r < 0) + return; + + if (s->kernel_seqnum) { + /* We already read this one? */ + if (serial < *s->kernel_seqnum) + return; + + /* Did we lose any? */ + if (serial > *s->kernel_seqnum) + server_driver_message(s, SD_MESSAGE_JOURNAL_MISSED, "Missed %llu kernel messages", (unsigned long long) serial - *s->kernel_seqnum - 1); + + /* Make sure we never read this one again. Note that + * we always store the next message serial we expect + * here, simply because this makes handling the first + * message with serial 0 easy. */ + *s->kernel_seqnum = serial + 1; + } + + l -= (e - p) + 1; + p = e + 1; + f = memchr(p, ';', l); + if (!f) + return; + /* Kernel 3.6 has the flags field, kernel 3.5 lacks that */ + e = memchr(p, ',', l); + if (!e || f < e) + e = f; + *e = 0; + + r = parse_usec(p, &usec); + if (r < 0) + return; + + l -= (f - p) + 1; + p = f + 1; + e = memchr(p, '\n', l); + if (!e) + return; + *e = 0; + + pl = e - p; + l -= (e - p) + 1; + k = e + 1; + + for (j = 0; l > 0 && j < N_IOVEC_KERNEL_FIELDS; j++) { + char *m; + /* Meta data fields attached */ + + if (*k != ' ') + break; + + k ++, l --; + + e = memchr(k, '\n', l); + if (!e) + return; + + *e = 0; + + m = cunescape_length_with_prefix(k, e - k, "_KERNEL_"); + if (!m) + break; + + if (startswith(m, "_KERNEL_DEVICE=")) + kernel_device = m + 15; + + IOVEC_SET_STRING(iovec[n++], m); + z++; + + l -= (e - k) + 1; + k = e + 1; + } + + if (kernel_device) { + struct udev_device *ud; + + ud = udev_device_new_from_device_id(s->udev, kernel_device); + if (ud) { + const char *g; + struct udev_list_entry *ll; + char *b; + + g = udev_device_get_devnode(ud); + if (g) { + b = strappend("_UDEV_DEVNODE=", g); + if (b) { + IOVEC_SET_STRING(iovec[n++], b); + z++; + } + } + + g = udev_device_get_sysname(ud); + if (g) { + b = strappend("_UDEV_SYSNAME=", g); + if (b) { + IOVEC_SET_STRING(iovec[n++], b); + z++; + } + } + + j = 0; + ll = udev_device_get_devlinks_list_entry(ud); + udev_list_entry_foreach(ll, ll) { + + if (j > N_IOVEC_UDEV_FIELDS) + break; + + g = udev_list_entry_get_name(ll); + b = strappend("_UDEV_DEVLINK=", g); + if (g) { + IOVEC_SET_STRING(iovec[n++], b); + z++; + } + + j++; + } + + udev_device_unref(ud); + } + } + + if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu", + (unsigned long long) usec) >= 0) + IOVEC_SET_STRING(iovec[n++], source_time); + + IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel"); + + if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) + IOVEC_SET_STRING(iovec[n++], syslog_priority); + + if ((priority & LOG_FACMASK) == LOG_KERN) + IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel"); + else { + syslog_read_identifier((const char**) &p, &identifier, &pid); + + /* Avoid any messages we generated ourselves via + * log_info() and friends. */ + if (pid && is_us(pid)) + goto finish; + + if (identifier) { + syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier); + if (syslog_identifier) + IOVEC_SET_STRING(iovec[n++], syslog_identifier); + } + + if (pid) { + syslog_pid = strappend("SYSLOG_PID=", pid); + if (syslog_pid) + IOVEC_SET_STRING(iovec[n++], syslog_pid); + } + + if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) + IOVEC_SET_STRING(iovec[n++], syslog_facility); + } + + message = cunescape_length_with_prefix(p, pl, "MESSAGE="); + if (message) + IOVEC_SET_STRING(iovec[n++], message); + + server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, NULL, priority); + +finish: + for (j = 0; j < z; j++) + free(iovec[j].iov_base); + + free(message); + free(syslog_priority); + free(syslog_identifier); + free(syslog_pid); + free(syslog_facility); + free(source_time); + free(identifier); + free(pid); +} + +int server_read_dev_kmsg(Server *s) { + char buffer[8192+1]; /* the kernel-side limit per record is 8K currently */ + ssize_t l; + + assert(s); + assert(s->dev_kmsg_fd >= 0); + + l = read(s->dev_kmsg_fd, buffer, sizeof(buffer) - 1); + if (l == 0) + return 0; + if (l < 0) { + /* Old kernels who don't allow reading from /dev/kmsg + * return EINVAL when we try. So handle this cleanly, + * but don' try to ever read from it again. */ + if (errno == EINVAL) { + epoll_ctl(s->epoll_fd, EPOLL_CTL_DEL, s->dev_kmsg_fd, NULL); + return 0; + } + + if (errno == EAGAIN || errno == EINTR || errno == EPIPE) + return 0; + + log_error("Failed to read from kernel: %m"); + return -errno; + } + + dev_kmsg_record(s, buffer, l); + return 1; +} + +int server_flush_dev_kmsg(Server *s) { + int r; + + assert(s); + + if (s->dev_kmsg_fd < 0) + return 0; + + if (!s->dev_kmsg_readable) + return 0; + + log_info("Flushing /dev/kmsg..."); + + for (;;) { + r = server_read_dev_kmsg(s); + if (r < 0) + return r; + + if (r == 0) + break; + } + + return 0; +} + +int server_open_dev_kmsg(Server *s) { + struct epoll_event ev; + + assert(s); + + s->dev_kmsg_fd = open("/dev/kmsg", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); + if (s->dev_kmsg_fd < 0) { + log_warning("Failed to open /dev/kmsg, ignoring: %m"); + return 0; + } + + zero(ev); + ev.events = EPOLLIN; + ev.data.fd = s->dev_kmsg_fd; + if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->dev_kmsg_fd, &ev) < 0) { + + /* This will fail with EPERM on older kernels where + * /dev/kmsg is not readable. */ + if (errno == EPERM) + return 0; + + log_error("Failed to add /dev/kmsg fd to epoll object: %m"); + return -errno; + } + + s->dev_kmsg_readable = true; + + return 0; +} + +int server_open_kernel_seqnum(Server *s) { + int fd; + uint64_t *p; + + assert(s); + + /* We store the seqnum we last read in an mmaped file. That + * way we can just use it like a variable, but it is + * persistant and automatically flushed at reboot. */ + + fd = open("/run/systemd/journal/kernel-seqnum", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644); + if (fd < 0) { + log_error("Failed to open /run/systemd/journal/kernel-seqnum, ignoring: %m"); + return 0; + } + + if (posix_fallocate(fd, 0, sizeof(uint64_t)) < 0) { + log_error("Failed to allocate sequential number file, ignoring: %m"); + close_nointr_nofail(fd); + return 0; + } + + p = mmap(NULL, sizeof(uint64_t), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); + if (p == MAP_FAILED) { + log_error("Failed to map sequential number file, ignoring: %m"); + close_nointr_nofail(fd); + return 0; + } + + close_nointr_nofail(fd); + s->kernel_seqnum = p; + + return 0; +} diff --git a/src/journal/journald-kmsg.h b/src/journal/journald-kmsg.h new file mode 100644 index 0000000000..0ebbaff752 --- /dev/null +++ b/src/journal/journald-kmsg.h @@ -0,0 +1,32 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright 2011 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include "journald.h" + +int server_open_dev_kmsg(Server *s); +int server_read_dev_kmsg(Server *s); +int server_flush_dev_kmsg(Server *s); + +void server_forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred); + +int server_open_kernel_seqnum(Server *s); diff --git a/src/journal/journald.c b/src/journal/journald.c index 5dc5c95cfa..fbdd688c37 100644 --- a/src/journal/journald.c +++ b/src/journal/journald.c @@ -52,6 +52,7 @@ #include "journal-authenticate.h" #include "conf-parser.h" #include "journald.h" +#include "journald-kmsg.h" #include "virt.h" #include "missing.h" @@ -73,10 +74,6 @@ #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC) -#define N_IOVEC_META_FIELDS 17 -#define N_IOVEC_KERNEL_FIELDS 64 -#define N_IOVEC_UDEV_FIELDS 32 - #define ENTRY_SIZE_MAX (1024*1024*32) typedef enum StdoutStreamState { @@ -716,7 +713,7 @@ static void dispatch_message_real( free(selinux_context); } -static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) { +void server_driver_message(Server *s, sd_id128_t message_id, const char *format, ...) { char mid[11 + 32 + 1]; char buffer[16 + LINE_MAX + 1]; struct iovec iovec[N_IOVEC_META_FIELDS + 4]; @@ -749,13 +746,15 @@ static void driver_message(Server *s, sd_id128_t message_id, const char *format, dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0, NULL); } -static void dispatch_message(Server *s, - struct iovec *iovec, unsigned n, unsigned m, - struct ucred *ucred, - struct timeval *tv, - const char *label, size_t label_len, - const char *unit_id, - int priority) { +void server_dispatch_message( + Server *s, + struct iovec *iovec, unsigned n, unsigned m, + struct ucred *ucred, + struct timeval *tv, + const char *label, size_t label_len, + const char *unit_id, + int priority) { + int rl; char *path = NULL, *c; @@ -800,7 +799,7 @@ static void dispatch_message(Server *s, /* Write a suppression message if we suppressed something */ if (rl > 1) - driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path); + server_driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path); free(path); @@ -948,69 +947,6 @@ static void forward_syslog(Server *s, int priority, const char *identifier, cons free(ident_buf); } -static int fixup_priority(int priority) { - - if ((priority & LOG_FACMASK) == 0) - return (priority & LOG_PRIMASK) | LOG_USER; - - return priority; -} - -static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) { - struct iovec iovec[5]; - char header_priority[6], header_pid[16]; - int n = 0; - char *ident_buf = NULL; - - assert(s); - assert(priority >= 0); - assert(priority <= 999); - assert(message); - - if (_unlikely_(LOG_PRI(priority) > s->max_level_kmsg)) - return; - - if (_unlikely_(s->dev_kmsg_fd < 0)) - return; - - /* Never allow messages with kernel facility to be written to - * kmsg, regardless where the data comes from. */ - priority = fixup_priority(priority); - - /* First: priority field */ - snprintf(header_priority, sizeof(header_priority), "<%i>", priority); - char_array_0(header_priority); - IOVEC_SET_STRING(iovec[n++], header_priority); - - /* Second: identifier and PID */ - if (ucred) { - if (!identifier) { - get_process_comm(ucred->pid, &ident_buf); - identifier = ident_buf; - } - - snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid); - char_array_0(header_pid); - - if (identifier) - IOVEC_SET_STRING(iovec[n++], identifier); - - IOVEC_SET_STRING(iovec[n++], header_pid); - } else if (identifier) { - IOVEC_SET_STRING(iovec[n++], identifier); - IOVEC_SET_STRING(iovec[n++], ": "); - } - - /* Fourth: message */ - IOVEC_SET_STRING(iovec[n++], message); - IOVEC_SET_STRING(iovec[n++], "\n"); - - if (writev(s->dev_kmsg_fd, iovec, n) < 0) - log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno)); - - free(ident_buf); -} - static void forward_console(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) { struct iovec iovec[4]; char header_pid[16]; @@ -1064,7 +1000,15 @@ finish: free(ident_buf); } -static void read_identifier(const char **buf, char **identifier, char **pid) { +int syslog_fixup_facility(int priority) { + + if ((priority & LOG_FACMASK) == 0) + return (priority & LOG_PRIMASK) | LOG_USER; + + return priority; +} + +void syslog_read_identifier(const char **buf, char **identifier, char **pid) { const char *p; char *t; size_t l, e; @@ -1126,16 +1070,16 @@ static void process_syslog_message(Server *s, const char *buf, struct ucred *ucr assert(buf); orig = buf; - parse_syslog_priority((char**) &buf, &priority); + syslog_parse_priority((char**) &buf, &priority); if (s->forward_to_syslog) forward_syslog_raw(s, priority, orig, ucred, tv); - skip_syslog_date((char**) &buf); - read_identifier(&buf, &identifier, &pid); + syslog_skip_date((char**) &buf); + syslog_read_identifier(&buf, &identifier, &pid); if (s->forward_to_kmsg) - forward_kmsg(s, priority, identifier, buf, ucred); + server_forward_kmsg(s, priority, identifier, buf, ucred); if (s->forward_to_console) forward_console(s, priority, identifier, buf, ucred); @@ -1165,7 +1109,7 @@ static void process_syslog_message(Server *s, const char *buf, struct ucred *ucr if (message) IOVEC_SET_STRING(iovec[n++], message); - dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, NULL, priority); + server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, NULL, priority); free(message); free(identifier); @@ -1244,7 +1188,7 @@ static void process_native_message( if (e == p) { /* Entry separator */ - dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority); + server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority); n = 0; priority = LOG_INFO; @@ -1388,13 +1332,13 @@ static void process_native_message( forward_syslog(s, priority, identifier, message, ucred, tv); if (s->forward_to_kmsg) - forward_kmsg(s, priority, identifier, message, ucred); + server_forward_kmsg(s, priority, identifier, message, ucred); if (s->forward_to_console) forward_console(s, priority, identifier, message, ucred); } - dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority); + server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority); finish: for (j = 0; j < n; j++) { @@ -1480,13 +1424,13 @@ static int stdout_stream_log(StdoutStream *s, const char *p) { priority = s->priority; if (s->level_prefix) - parse_syslog_priority((char**) &p, &priority); + syslog_parse_priority((char**) &p, &priority); if (s->forward_to_syslog || s->server->forward_to_syslog) - forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL); + forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL); if (s->forward_to_kmsg || s->server->forward_to_kmsg) - forward_kmsg(s->server, priority, s->identifier, p, &s->ucred); + server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred); if (s->forward_to_console || s->server->forward_to_console) forward_console(s->server, priority, s->identifier, p, &s->ucred); @@ -1517,7 +1461,7 @@ static int stdout_stream_log(StdoutStream *s, const char *p) { } #endif - dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, s->unit_id, priority); + server_dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, s->unit_id, priority); free(message); free(syslog_priority); @@ -1801,231 +1745,6 @@ fail: return r; } -static bool is_us(const char *pid) { - pid_t t; - - assert(pid); - - if (parse_pid(pid, &t) < 0) - return false; - - return t == getpid(); -} - -static void dev_kmsg_record(Server *s, char *p, size_t l) { - struct iovec iovec[N_IOVEC_META_FIELDS + 7 + N_IOVEC_KERNEL_FIELDS + 2 + N_IOVEC_UDEV_FIELDS]; - char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL; - int priority, r; - unsigned n = 0, z = 0, j; - usec_t usec; - char *identifier = NULL, *pid = NULL, *e, *f, *k; - uint64_t serial; - size_t pl; - char *kernel_device = NULL; - - assert(s); - assert(p); - - if (l <= 0) - return; - - e = memchr(p, ',', l); - if (!e) - return; - *e = 0; - - r = safe_atoi(p, &priority); - if (r < 0 || priority < 0 || priority > 999) - return; - - if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN) - return; - - l -= (e - p) + 1; - p = e + 1; - e = memchr(p, ',', l); - if (!e) - return; - *e = 0; - - r = safe_atou64(p, &serial); - if (r < 0) - return; - - if (s->kernel_seqnum) { - /* We already read this one? */ - if (serial < *s->kernel_seqnum) - return; - - /* Did we lose any? */ - if (serial > *s->kernel_seqnum) - driver_message(s, SD_MESSAGE_JOURNAL_MISSED, "Missed %llu kernel messages", (unsigned long long) serial - *s->kernel_seqnum - 1); - - /* Make sure we never read this one again. Note that - * we always store the next message serial we expect - * here, simply because this makes handling the first - * message with serial 0 easy. */ - *s->kernel_seqnum = serial + 1; - } - - l -= (e - p) + 1; - p = e + 1; - f = memchr(p, ';', l); - if (!f) - return; - /* Kernel 3.6 has the flags field, kernel 3.5 lacks that */ - e = memchr(p, ',', l); - if (!e || f < e) - e = f; - *e = 0; - - r = parse_usec(p, &usec); - if (r < 0) - return; - - l -= (f - p) + 1; - p = f + 1; - e = memchr(p, '\n', l); - if (!e) - return; - *e = 0; - - pl = e - p; - l -= (e - p) + 1; - k = e + 1; - - for (j = 0; l > 0 && j < N_IOVEC_KERNEL_FIELDS; j++) { - char *m; - /* Meta data fields attached */ - - if (*k != ' ') - break; - - k ++, l --; - - e = memchr(k, '\n', l); - if (!e) - return; - - *e = 0; - - m = cunescape_length_with_prefix(k, e - k, "_KERNEL_"); - if (!m) - break; - - if (startswith(m, "_KERNEL_DEVICE=")) - kernel_device = m + 15; - - IOVEC_SET_STRING(iovec[n++], m); - z++; - - l -= (e - k) + 1; - k = e + 1; - } - - if (kernel_device) { - struct udev_device *ud; - - ud = udev_device_new_from_device_id(s->udev, kernel_device); - if (ud) { - const char *g; - struct udev_list_entry *ll; - char *b; - - g = udev_device_get_devnode(ud); - if (g) { - b = strappend("_UDEV_DEVNODE=", g); - if (b) { - IOVEC_SET_STRING(iovec[n++], b); - z++; - } - } - - g = udev_device_get_sysname(ud); - if (g) { - b = strappend("_UDEV_SYSNAME=", g); - if (b) { - IOVEC_SET_STRING(iovec[n++], b); - z++; - } - } - - j = 0; - ll = udev_device_get_devlinks_list_entry(ud); - udev_list_entry_foreach(ll, ll) { - - if (j > N_IOVEC_UDEV_FIELDS) - break; - - g = udev_list_entry_get_name(ll); - b = strappend("_UDEV_DEVLINK=", g); - if (g) { - IOVEC_SET_STRING(iovec[n++], b); - z++; - } - - j++; - } - - udev_device_unref(ud); - } - } - - if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu", - (unsigned long long) usec) >= 0) - IOVEC_SET_STRING(iovec[n++], source_time); - - IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel"); - - if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) - IOVEC_SET_STRING(iovec[n++], syslog_priority); - - if ((priority & LOG_FACMASK) == LOG_KERN) - IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel"); - else { - read_identifier((const char**) &p, &identifier, &pid); - - /* Avoid any messages we generated ourselves via - * log_info() and friends. */ - if (pid && is_us(pid)) - goto finish; - - if (identifier) { - syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier); - if (syslog_identifier) - IOVEC_SET_STRING(iovec[n++], syslog_identifier); - } - - if (pid) { - syslog_pid = strappend("SYSLOG_PID=", pid); - if (syslog_pid) - IOVEC_SET_STRING(iovec[n++], syslog_pid); - } - - if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) - IOVEC_SET_STRING(iovec[n++], syslog_facility); - } - - message = cunescape_length_with_prefix(p, pl, "MESSAGE="); - if (message) - IOVEC_SET_STRING(iovec[n++], message); - - dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, NULL, priority); - -finish: - for (j = 0; j < z; j++) - free(iovec[j].iov_base); - - free(message); - free(syslog_priority); - free(syslog_identifier); - free(syslog_pid); - free(syslog_facility); - free(source_time); - free(identifier); - free(pid); -} - static int system_journal_open(Server *s) { int r; char *fn; @@ -2196,61 +1915,6 @@ finish: return r; } -static int server_read_dev_kmsg(Server *s) { - char buffer[8192+1]; /* the kernel-side limit per record is 8K currently */ - ssize_t l; - - assert(s); - assert(s->dev_kmsg_fd >= 0); - - l = read(s->dev_kmsg_fd, buffer, sizeof(buffer) - 1); - if (l == 0) - return 0; - if (l < 0) { - /* Old kernels who don't allow reading from /dev/kmsg - * return EINVAL when we try. So handle this cleanly, - * but don' try to ever read from it again. */ - if (errno == EINVAL) { - epoll_ctl(s->epoll_fd, EPOLL_CTL_DEL, s->dev_kmsg_fd, NULL); - return 0; - } - - if (errno == EAGAIN || errno == EINTR || errno == EPIPE) - return 0; - - log_error("Failed to read from kernel: %m"); - return -errno; - } - - dev_kmsg_record(s, buffer, l); - return 1; -} - -static int server_flush_dev_kmsg(Server *s) { - int r; - - assert(s); - - if (s->dev_kmsg_fd < 0) - return 0; - - if (!s->dev_kmsg_readable) - return 0; - - log_info("Flushing /dev/kmsg..."); - - for (;;) { - r = server_read_dev_kmsg(s); - if (r < 0) - return r; - - if (r == 0) - break; - } - - return 0; -} - static int process_event(Server *s, struct epoll_event *ev) { assert(s); assert(ev); @@ -2645,71 +2309,6 @@ static int open_stdout_socket(Server *s) { return 0; } -static int open_dev_kmsg(Server *s) { - struct epoll_event ev; - - assert(s); - - s->dev_kmsg_fd = open("/dev/kmsg", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); - if (s->dev_kmsg_fd < 0) { - log_warning("Failed to open /dev/kmsg, ignoring: %m"); - return 0; - } - - zero(ev); - ev.events = EPOLLIN; - ev.data.fd = s->dev_kmsg_fd; - if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->dev_kmsg_fd, &ev) < 0) { - - /* This will fail with EPERM on older kernels where - * /dev/kmsg is not readable. */ - if (errno == EPERM) - return 0; - - log_error("Failed to add /dev/kmsg fd to epoll object: %m"); - return -errno; - } - - s->dev_kmsg_readable = true; - - return 0; -} - -static int open_kernel_seqnum(Server *s) { - int fd; - uint64_t *p; - - assert(s); - - /* We store the seqnum we last read in an mmaped file. That - * way we can just use it like a variable, but it is - * persistant and automatically flushed at reboot. */ - - fd = open("/run/systemd/journal/kernel-seqnum", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644); - if (fd < 0) { - log_error("Failed to open /run/systemd/journal/kernel-seqnum, ignoring: %m"); - return 0; - } - - if (posix_fallocate(fd, 0, sizeof(uint64_t)) < 0) { - log_error("Failed to allocate sequential number file, ignoring: %m"); - close_nointr_nofail(fd); - return 0; - } - - p = mmap(NULL, sizeof(uint64_t), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); - if (p == MAP_FAILED) { - log_error("Failed to map sequential number file, ignoring: %m"); - close_nointr_nofail(fd); - return 0; - } - - close_nointr_nofail(fd); - s->kernel_seqnum = p; - - return 0; -} - static int open_signalfd(Server *s) { sigset_t mask; struct epoll_event ev; @@ -2913,11 +2512,11 @@ static int server_init(Server *s) { if (r < 0) return r; - r = open_dev_kmsg(s); + r = server_open_dev_kmsg(s); if (r < 0) return r; - r = open_kernel_seqnum(s); + r = server_open_kernel_seqnum(s); if (r < 0) return r; @@ -3039,7 +2638,7 @@ int main(int argc, char *argv[]) { server_flush_dev_kmsg(&server); log_debug("systemd-journald running as pid %lu", (unsigned long) getpid()); - driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started"); + server_driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started"); sd_notify(false, "READY=1\n" @@ -3089,7 +2688,7 @@ int main(int argc, char *argv[]) { } log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid()); - driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped"); + server_driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped"); finish: sd_notify(false, diff --git a/src/journal/journald.h b/src/journal/journald.h index da2c312474..b73be0ab35 100644 --- a/src/journal/journald.h +++ b/src/journal/journald.h @@ -103,6 +103,14 @@ typedef struct Server { struct udev *udev; } Server; +#define N_IOVEC_META_FIELDS 17 +#define N_IOVEC_KERNEL_FIELDS 64 +#define N_IOVEC_UDEV_FIELDS 32 + +void server_dispatch_message(Server *s, struct iovec *iovec, unsigned n, unsigned m, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len, const char *unit_id, int priority); + +void server_driver_message(Server *s, sd_id128_t message_id, const char *format, ...); + /* gperf lookup function */ const struct ConfigPerfItem* journald_gperf_lookup(const char *key, unsigned length); @@ -110,3 +118,6 @@ int config_parse_storage(const char *filename, unsigned line, const char *sectio const char *storage_to_string(Storage s); Storage storage_from_string(const char *s); + +int syslog_fixup_facility(int priority); +void syslog_read_identifier(const char **buf, char **identifier, char **pid); |