diff options
Diffstat (limited to 'src/journal/journal-send.c')
| -rw-r--r-- | src/journal/journal-send.c | 575 |
1 files changed, 0 insertions, 575 deletions
diff --git a/src/journal/journal-send.c b/src/journal/journal-send.c deleted file mode 100644 index 440fba67ca..0000000000 --- a/src/journal/journal-send.c +++ /dev/null @@ -1,575 +0,0 @@ -/*** - 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 <errno.h> -#include <fcntl.h> -#include <printf.h> -#include <stddef.h> -#include <sys/socket.h> -#include <sys/un.h> -#include <unistd.h> - -#define SD_JOURNAL_SUPPRESS_LOCATION - -#include "sd-journal.h" - -#include "alloc-util.h" -#include "fd-util.h" -#include "fileio.h" -#include "io-util.h" -#include "memfd-util.h" -#include "socket-util.h" -#include "stdio-util.h" -#include "string-util.h" -#include "util.h" - -#define SNDBUF_SIZE (8*1024*1024) - -#define ALLOCA_CODE_FUNC(f, func) \ - do { \ - size_t _fl; \ - const char *_func = (func); \ - char **_f = &(f); \ - _fl = strlen(_func) + 1; \ - *_f = alloca(_fl + 10); \ - memcpy(*_f, "CODE_FUNC=", 10); \ - memcpy(*_f + 10, _func, _fl); \ - } while (false) - -/* 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; - - fd_inc_sndbuf(fd, SNDBUF_SIZE); - - if (!__sync_bool_compare_and_swap(&fd_plus_one, 0, fd+1)) { - safe_close(fd); - goto retry; - } - - return fd; -} - -_public_ 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; -} - -_public_ int sd_journal_printv(int priority, const char *format, va_list ap) { - - /* FIXME: Instead of limiting things to LINE_MAX we could do a - C99 variable-length array on the stack here in a loop. */ - - char buffer[8 + LINE_MAX], p[sizeof("PRIORITY=")-1 + DECIMAL_STR_MAX(int) + 1]; - struct iovec iov[2]; - - assert_return(priority >= 0, -EINVAL); - assert_return(priority <= 7, -EINVAL); - assert_return(format, -EINVAL); - - xsprintf(p, "PRIORITY=%i", priority & LOG_PRIMASK); - - memcpy(buffer, "MESSAGE=", 8); - vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap); - - /* Strip trailing whitespace, keep prefix whitespace. */ - (void) strstrip(buffer); - - /* Suppress empty lines */ - if (isempty(buffer+8)) - return 0; - - zero(iov); - IOVEC_SET_STRING(iov[0], buffer); - IOVEC_SET_STRING(iov[1], p); - - return sd_journal_sendv(iov, 2); -} - -_printf_(1, 0) static int fill_iovec_sprintf(const char *format, va_list ap, int extra, struct iovec **_iov) { - PROTECT_ERRNO; - int r, n = 0, i = 0, j; - struct iovec *iov = NULL; - - assert(_iov); - - if (extra > 0) { - n = MAX(extra * 2, extra + 4); - iov = malloc0(n * sizeof(struct iovec)); - if (!iov) { - r = -ENOMEM; - goto fail; - } - - i = extra; - } - - while (format) { - struct iovec *c; - char *buffer; - va_list aq; - - if (i >= n) { - n = MAX(i*2, 4); - c = realloc(iov, n * sizeof(struct iovec)); - if (!c) { - r = -ENOMEM; - goto fail; - } - - iov = c; - } - - va_copy(aq, ap); - if (vasprintf(&buffer, format, aq) < 0) { - va_end(aq); - r = -ENOMEM; - goto fail; - } - va_end(aq); - - VA_FORMAT_ADVANCE(format, ap); - - (void) strstrip(buffer); /* strip trailing whitespace, keep prefixing whitespace */ - - IOVEC_SET_STRING(iov[i++], buffer); - - format = va_arg(ap, char *); - } - - *_iov = iov; - - return i; - -fail: - for (j = 0; j < i; j++) - free(iov[j].iov_base); - - free(iov); - - return r; -} - -_public_ int sd_journal_send(const char *format, ...) { - int r, i, j; - va_list ap; - struct iovec *iov = NULL; - - va_start(ap, format); - i = fill_iovec_sprintf(format, ap, 0, &iov); - va_end(ap); - - if (_unlikely_(i < 0)) { - r = i; - goto finish; - } - - r = sd_journal_sendv(iov, i); - -finish: - for (j = 0; j < i; j++) - free(iov[j].iov_base); - - free(iov); - - return r; -} - -_public_ int sd_journal_sendv(const struct iovec *iov, int n) { - PROTECT_ERRNO; - int fd, r; - _cleanup_close_ int buffer_fd = -1; - struct iovec *w; - uint64_t *l; - int i, j = 0; - static const union sockaddr_union sa = { - .un.sun_family = AF_UNIX, - .un.sun_path = "/run/systemd/journal/socket", - }; - struct msghdr mh = { - .msg_name = (struct sockaddr*) &sa.sa, - .msg_namelen = SOCKADDR_UN_LEN(sa.un), - }; - ssize_t k; - bool have_syslog_identifier = false; - bool seal = true; - - assert_return(iov, -EINVAL); - assert_return(n > 0, -EINVAL); - - w = newa(struct iovec, n * 5 + 3); - l = newa(uint64_t, n); - - for (i = 0; i < n; i++) { - char *c, *nl; - - if (_unlikely_(!iov[i].iov_base || iov[i].iov_len <= 1)) - return -EINVAL; - - c = memchr(iov[i].iov_base, '=', iov[i].iov_len); - if (_unlikely_(!c || c == iov[i].iov_base)) - return -EINVAL; - - have_syslog_identifier = have_syslog_identifier || - (c == (char *) iov[i].iov_base + 17 && - startswith(iov[i].iov_base, "SYSLOG_IDENTIFIER")); - - nl = memchr(iov[i].iov_base, '\n', iov[i].iov_len); - if (nl) { - if (_unlikely_(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"); - } - - if (!have_syslog_identifier && - string_is_safe(program_invocation_short_name)) { - - /* Implicitly add program_invocation_short_name, if it - * is not set explicitly. We only do this for - * program_invocation_short_name, and nothing else - * since everything else is much nicer to retrieve - * from the outside. */ - - IOVEC_SET_STRING(w[j++], "SYSLOG_IDENTIFIER="); - IOVEC_SET_STRING(w[j++], program_invocation_short_name); - IOVEC_SET_STRING(w[j++], "\n"); - } - - fd = journal_fd(); - if (_unlikely_(fd < 0)) - return fd; - - mh.msg_iov = w; - mh.msg_iovlen = j; - - k = sendmsg(fd, &mh, MSG_NOSIGNAL); - if (k >= 0) - return 0; - - /* Fail silently if the journal is not available */ - if (errno == ENOENT) - return 0; - - if (errno != EMSGSIZE && errno != ENOBUFS) - return -errno; - - /* Message doesn't fit... Let's dump the data in a memfd or - * temporary file and just pass a file descriptor of it to the - * other side. - * - * For the temporary files we use /dev/shm instead of /tmp - * here, since we want this to be a tmpfs, and one that is - * available from early boot on and where unprivileged users - * can create files. */ - buffer_fd = memfd_new(NULL); - if (buffer_fd < 0) { - if (buffer_fd == -ENOSYS) { - buffer_fd = open_tmpfile_unlinkable("/dev/shm", O_RDWR | O_CLOEXEC); - if (buffer_fd < 0) - return buffer_fd; - - seal = false; - } else - return buffer_fd; - } - - n = writev(buffer_fd, w, j); - if (n < 0) - return -errno; - - if (seal) { - r = memfd_set_sealed(buffer_fd); - if (r < 0) - return r; - } - - r = send_one_fd_sa(fd, buffer_fd, mh.msg_name, mh.msg_namelen, 0); - if (r == -ENOENT) - /* Fail silently if the journal is not available */ - return 0; - return r; -} - -static int fill_iovec_perror_and_send(const char *message, int skip, struct iovec iov[]) { - PROTECT_ERRNO; - size_t n, k; - - k = isempty(message) ? 0 : strlen(message) + 2; - n = 8 + k + 256 + 1; - - for (;;) { - char buffer[n]; - char* j; - - errno = 0; - j = strerror_r(_saved_errno_, buffer + 8 + k, n - 8 - k); - if (errno == 0) { - char error[sizeof("ERRNO=")-1 + DECIMAL_STR_MAX(int) + 1]; - - if (j != buffer + 8 + k) - memmove(buffer + 8 + k, j, strlen(j)+1); - - memcpy(buffer, "MESSAGE=", 8); - - if (k > 0) { - memcpy(buffer + 8, message, k - 2); - memcpy(buffer + 8 + k - 2, ": ", 2); - } - - xsprintf(error, "ERRNO=%i", _saved_errno_); - - assert_cc(3 == LOG_ERR); - IOVEC_SET_STRING(iov[skip+0], "PRIORITY=3"); - IOVEC_SET_STRING(iov[skip+1], buffer); - IOVEC_SET_STRING(iov[skip+2], error); - - return sd_journal_sendv(iov, skip + 3); - } - - if (errno != ERANGE) - return -errno; - - n *= 2; - } -} - -_public_ int sd_journal_perror(const char *message) { - struct iovec iovec[3]; - - return fill_iovec_perror_and_send(message, 0, iovec); -} - -_public_ int sd_journal_stream_fd(const char *identifier, int priority, int level_prefix) { - static const union sockaddr_union sa = { - .un.sun_family = AF_UNIX, - .un.sun_path = "/run/systemd/journal/stdout", - }; - _cleanup_close_ int fd = -1; - char *header; - size_t l; - int r; - - assert_return(priority >= 0, -EINVAL); - assert_return(priority <= 7, -EINVAL); - - fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); - if (fd < 0) - return -errno; - - r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); - if (r < 0) - return -errno; - - if (shutdown(fd, SHUT_RD) < 0) - return -errno; - - fd_inc_sndbuf(fd, SNDBUF_SIZE); - - if (!identifier) - identifier = ""; - - l = strlen(identifier); - header = alloca(l + 1 + 1 + 2 + 2 + 2 + 2 + 2); - - memcpy(header, identifier, l); - header[l++] = '\n'; - header[l++] = '\n'; /* unit id */ - header[l++] = '0' + priority; - header[l++] = '\n'; - header[l++] = '0' + !!level_prefix; - header[l++] = '\n'; - header[l++] = '0'; - header[l++] = '\n'; - header[l++] = '0'; - header[l++] = '\n'; - header[l++] = '0'; - header[l++] = '\n'; - - r = loop_write(fd, header, l, false); - if (r < 0) - return r; - - r = fd; - fd = -1; - return r; -} - -_public_ int sd_journal_print_with_location(int priority, const char *file, const char *line, const char *func, const char *format, ...) { - int r; - va_list ap; - - va_start(ap, format); - r = sd_journal_printv_with_location(priority, file, line, func, format, ap); - va_end(ap); - - return r; -} - -_public_ int sd_journal_printv_with_location(int priority, const char *file, const char *line, const char *func, const char *format, va_list ap) { - char buffer[8 + LINE_MAX], p[sizeof("PRIORITY=")-1 + DECIMAL_STR_MAX(int) + 1]; - struct iovec iov[5]; - char *f; - - assert_return(priority >= 0, -EINVAL); - assert_return(priority <= 7, -EINVAL); - assert_return(format, -EINVAL); - - xsprintf(p, "PRIORITY=%i", priority & LOG_PRIMASK); - - memcpy(buffer, "MESSAGE=", 8); - vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap); - - /* Strip trailing whitespace, keep prefixing whitespace */ - (void) strstrip(buffer); - - /* Suppress empty lines */ - if (isempty(buffer+8)) - return 0; - - /* func is initialized from __func__ which is not a macro, but - * a static const char[], hence cannot easily be prefixed with - * CODE_FUNC=, hence let's do it manually here. */ - ALLOCA_CODE_FUNC(f, func); - - zero(iov); - IOVEC_SET_STRING(iov[0], buffer); - IOVEC_SET_STRING(iov[1], p); - IOVEC_SET_STRING(iov[2], file); - IOVEC_SET_STRING(iov[3], line); - IOVEC_SET_STRING(iov[4], f); - - return sd_journal_sendv(iov, ELEMENTSOF(iov)); -} - -_public_ int sd_journal_send_with_location(const char *file, const char *line, const char *func, const char *format, ...) { - int r, i, j; - va_list ap; - struct iovec *iov = NULL; - char *f; - - va_start(ap, format); - i = fill_iovec_sprintf(format, ap, 3, &iov); - va_end(ap); - - if (_unlikely_(i < 0)) { - r = i; - goto finish; - } - - ALLOCA_CODE_FUNC(f, func); - - IOVEC_SET_STRING(iov[0], file); - IOVEC_SET_STRING(iov[1], line); - IOVEC_SET_STRING(iov[2], f); - - r = sd_journal_sendv(iov, i); - -finish: - for (j = 3; j < i; j++) - free(iov[j].iov_base); - - free(iov); - - return r; -} - -_public_ int sd_journal_sendv_with_location( - const char *file, const char *line, - const char *func, - const struct iovec *iov, int n) { - - struct iovec *niov; - char *f; - - assert_return(iov, -EINVAL); - assert_return(n > 0, -EINVAL); - - niov = alloca(sizeof(struct iovec) * (n + 3)); - memcpy(niov, iov, sizeof(struct iovec) * n); - - ALLOCA_CODE_FUNC(f, func); - - IOVEC_SET_STRING(niov[n++], file); - IOVEC_SET_STRING(niov[n++], line); - IOVEC_SET_STRING(niov[n++], f); - - return sd_journal_sendv(niov, n); -} - -_public_ int sd_journal_perror_with_location( - const char *file, const char *line, - const char *func, - const char *message) { - - struct iovec iov[6]; - char *f; - - ALLOCA_CODE_FUNC(f, func); - - IOVEC_SET_STRING(iov[0], file); - IOVEC_SET_STRING(iov[1], line); - IOVEC_SET_STRING(iov[2], f); - - return fill_iovec_perror_and_send(message, 3, iov); -} |