diff options
Diffstat (limited to 'src/journal/journal-send.c')
| -rw-r--r-- | src/journal/journal-send.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/src/journal/journal-send.c b/src/journal/journal-send.c new file mode 100644 index 0000000000..cc3cd8c303 --- /dev/null +++ b/src/journal/journal-send.c @@ -0,0 +1,259 @@ +/*-*- 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 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/un.h> +#include <errno.h> +#include <stddef.h> + +#include "sd-journal.h" +#include "util.h" +#include "socket-util.h" + +/* We open a single fd, and we'll share it with the current process, + * all its threads, and all its subprocesses. This means we need to + * initialize it atomically, and need to operate on it atomically + * never assuming we are the only user */ + +static int journal_fd(void) { + int fd; + static int fd_plus_one = 0; + +retry: + if (fd_plus_one > 0) + return fd_plus_one - 1; + + fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); + if (fd < 0) + return -errno; + + if (!__sync_bool_compare_and_swap(&fd_plus_one, 0, fd+1)) { + close_nointr_nofail(fd); + goto retry; + } + + return fd; +} + +int sd_journal_print(int priority, const char *format, ...) { + int r; + va_list ap; + + va_start(ap, format); + r = sd_journal_printv(priority, format, ap); + va_end(ap); + + return r; +} + +int sd_journal_printv(int priority, const char *format, va_list ap) { + char buffer[8 + LINE_MAX], p[11]; + struct iovec iov[2]; + + if (priority < 0 || priority > 7) + return -EINVAL; + + if (!format) + return -EINVAL; + + snprintf(p, sizeof(p), "PRIORITY=%i", priority & LOG_PRIMASK); + char_array_0(p); + + memcpy(buffer, "MESSAGE=", 8); + vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap); + char_array_0(buffer); + + zero(iov); + IOVEC_SET_STRING(iov[0], buffer); + IOVEC_SET_STRING(iov[1], p); + + return sd_journal_sendv(iov, 2); +} + +int sd_journal_send(const char *format, ...) { + int r, n = 0, i = 0, j; + va_list ap; + struct iovec *iov = NULL; + + va_start(ap, format); + while (format) { + struct iovec *c; + char *buffer; + + if (i >= n) { + n = MAX(i*2, 4); + c = realloc(iov, n * sizeof(struct iovec)); + if (!c) { + r = -ENOMEM; + goto fail; + } + + iov = c; + } + + if (vasprintf(&buffer, format, ap) < 0) { + r = -ENOMEM; + goto fail; + } + + IOVEC_SET_STRING(iov[i++], buffer); + + format = va_arg(ap, char *); + } + va_end(ap); + + r = sd_journal_sendv(iov, i); + +fail: + for (j = 0; j < i; j++) + free(iov[j].iov_base); + + free(iov); + + return r; +} + +int sd_journal_sendv(const struct iovec *iov, int n) { + int fd; + struct iovec *w; + uint64_t *l; + int i, j = 0; + struct msghdr mh; + struct sockaddr_un sa; + + if (!iov || n <= 0) + return -EINVAL; + + w = alloca(sizeof(struct iovec) * n * 5); + l = alloca(sizeof(uint64_t) * n); + + for (i = 0; i < n; i++) { + char *c, *nl; + + c = memchr(iov[i].iov_base, '=', iov[i].iov_len); + if (!c) + return -EINVAL; + + nl = memchr(iov[i].iov_base, '\n', iov[i].iov_len); + if (nl) { + if (nl < c) + return -EINVAL; + + /* Already includes a newline? Bummer, then + * let's write the variable name, then a + * newline, then the size (64bit LE), followed + * by the data and a final newline */ + + w[j].iov_base = iov[i].iov_base; + w[j].iov_len = c - (char*) iov[i].iov_base; + j++; + + IOVEC_SET_STRING(w[j++], "\n"); + + l[i] = htole64(iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1); + w[j].iov_base = &l[i]; + w[j].iov_len = sizeof(uint64_t); + j++; + + w[j].iov_base = c + 1; + w[j].iov_len = iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1; + j++; + + } else + /* Nothing special? Then just add the line and + * append a newline */ + w[j++] = iov[i]; + + IOVEC_SET_STRING(w[j++], "\n"); + } + + fd = journal_fd(); + if (fd < 0) + return fd; + + zero(sa); + sa.sun_family = AF_UNIX; + strncpy(sa.sun_path,"/run/systemd/journal", sizeof(sa.sun_path)); + + zero(mh); + mh.msg_name = &sa; + mh.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(sa.sun_path); + mh.msg_iov = w; + mh.msg_iovlen = j; + + if (sendmsg(fd, &mh, MSG_NOSIGNAL) < 0) + return -errno; + + return 0; +} + +int sd_journal_stream_fd(const char *tag, int priority, int priority_prefix) { + union sockaddr_union sa; + int fd; + char *header; + size_t l; + ssize_t r; + + if (priority < 0 || priority > 7) + return -EINVAL; + + fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); + if (fd < 0) + return -errno; + + zero(sa); + sa.un.sun_family = AF_UNIX; + strncpy(sa.un.sun_path, "/run/systemd/stdout", sizeof(sa.un.sun_path)); + + r = connect(fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); + if (r < 0) { + close_nointr_nofail(fd); + return -errno; + } + + if (!tag) + tag = ""; + + l = strlen(tag); + header = alloca(l + 1 + 2 + 2 + 2); + + memcpy(header, tag, l); + header[l++] = '\n'; + header[l++] = '0' + priority; + header[l++] = '\n'; + header[l++] = '0' + !!priority_prefix; + header[l++] = '\n'; + header[l++] = '0'; + header[l++] = '\n'; + + r = loop_write(fd, header, l, false); + if (r < 0) { + close_nointr_nofail(fd); + return (int) r; + } + + if ((size_t) r != l) { + close_nointr_nofail(fd); + return -errno; + } + + return fd; +} |