| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2012 Zbigniew Jędrzejewski-Szmek |
| |
| 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 <locale.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <getopt.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| |
| #include <systemd/sd-journal.h> |
| |
| #include "build.h" |
| #include "set.h" |
| #include "util.h" |
| #include "log.h" |
| #include "path-util.h" |
| #include "pager.h" |
| #include "macro.h" |
| #include "journal-internal.h" |
| |
| static enum { |
| ACTION_NONE, |
| ACTION_LIST, |
| ACTION_DUMP, |
| ACTION_GDB, |
| } arg_action = ACTION_LIST; |
| |
| static FILE* output = NULL; |
| static char* field = NULL; |
| |
| static int arg_no_pager = false; |
| static int arg_no_legend = false; |
| |
| static Set *new_matches(void) { |
| Set *set; |
| char *tmp; |
| int r; |
| |
| set = set_new(trivial_hash_func, trivial_compare_func); |
| if (!set) { |
| log_oom(); |
| return NULL; |
| } |
| |
| tmp = strdup("MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); |
| if (!tmp) { |
| log_oom(); |
| set_free(set); |
| return NULL; |
| } |
| |
| r = set_consume(set, tmp); |
| if (r < 0) { |
| log_error("failed to add to set: %s", strerror(-r)); |
| set_free(set); |
| return NULL; |
| } |
| |
| return set; |
| } |
| |
| static int help(void) { |
| printf("%s [OPTIONS...] [MATCHES...]\n\n" |
| "List or retrieve coredumps from the journal.\n\n" |
| "Flags:\n" |
| " -o --output=FILE Write output to FILE\n" |
| " --no-pager Do not pipe output into a pager\n" |
| " --no-legend Do not print the column headers.\n\n" |
| |
| "Commands:\n" |
| " -h --help Show this help\n" |
| " --version Print version string\n" |
| " -F --field=FIELD List all values a certain field takes\n" |
| " gdb Start gdb for the first matching coredump\n" |
| " list List available coredumps\n" |
| " dump PID Print coredump to stdout\n" |
| " dump PATH Print coredump to stdout\n" |
| , program_invocation_short_name); |
| |
| return 0; |
| } |
| |
| static int add_match(Set *set, const char *match) { |
| int r = -ENOMEM; |
| unsigned pid; |
| const char* prefix; |
| char *pattern = NULL; |
| _cleanup_free_ char *p = NULL; |
| |
| if (strchr(match, '=')) |
| prefix = ""; |
| else if (strchr(match, '/')) { |
| p = path_make_absolute_cwd(match); |
| if (!p) |
| goto fail; |
| |
| match = p; |
| prefix = "COREDUMP_EXE="; |
| } |
| else if (safe_atou(match, &pid) == 0) |
| prefix = "COREDUMP_PID="; |
| else |
| prefix = "COREDUMP_COMM="; |
| |
| pattern = strjoin(prefix, match, NULL); |
| if (!pattern) |
| goto fail; |
| |
| log_debug("Adding pattern: %s", pattern); |
| r = set_put(set, pattern); |
| if (r < 0) { |
| log_error("Failed to add pattern '%s': %s", |
| pattern, strerror(-r)); |
| free(pattern); |
| goto fail; |
| } |
| |
| return 0; |
| fail: |
| log_error("Failed to add match: %s", strerror(-r)); |
| return r; |
| } |
| |
| static int parse_argv(int argc, char *argv[], Set *matches) { |
| enum { |
| ARG_VERSION = 0x100, |
| ARG_NO_PAGER, |
| ARG_NO_LEGEND, |
| }; |
| |
| int r, c; |
| |
| static const struct option options[] = { |
| { "help", no_argument, NULL, 'h' }, |
| { "version" , no_argument, NULL, ARG_VERSION }, |
| { "no-pager", no_argument, NULL, ARG_NO_PAGER }, |
| { "no-legend", no_argument, NULL, ARG_NO_LEGEND }, |
| { "output", required_argument, NULL, 'o' }, |
| { "field", required_argument, NULL, 'F' }, |
| {} |
| }; |
| |
| assert(argc >= 0); |
| assert(argv); |
| |
| while ((c = getopt_long(argc, argv, "ho:F:", options, NULL)) >= 0) |
| switch(c) { |
| |
| case 'h': |
| arg_action = ACTION_NONE; |
| return help(); |
| |
| case ARG_VERSION: |
| arg_action = ACTION_NONE; |
| puts(PACKAGE_STRING); |
| puts(SYSTEMD_FEATURES); |
| return 0; |
| |
| case ARG_NO_PAGER: |
| arg_no_pager = true; |
| break; |
| |
| case ARG_NO_LEGEND: |
| arg_no_legend = true; |
| break; |
| |
| case 'o': |
| if (output) { |
| log_error("cannot set output more than once"); |
| return -EINVAL; |
| } |
| |
| output = fopen(optarg, "we"); |
| if (!output) { |
| log_error("writing to '%s': %m", optarg); |
| return -errno; |
| } |
| |
| break; |
| |
| case 'F': |
| if (field) { |
| log_error("cannot use --field/-F more than once"); |
| return -EINVAL; |
| } |
| |
| field = optarg; |
| break; |
| |
| case '?': |
| return -EINVAL; |
| |
| default: |
| assert_not_reached("Unhandled option"); |
| } |
| |
| if (optind < argc) { |
| const char *cmd = argv[optind++]; |
| if (streq(cmd, "list")) |
| arg_action = ACTION_LIST; |
| else if (streq(cmd, "dump")) |
| arg_action = ACTION_DUMP; |
| else if (streq(cmd, "gdb")) |
| arg_action = ACTION_GDB; |
| else { |
| log_error("Unknown action '%s'", cmd); |
| return -EINVAL; |
| } |
| } |
| |
| if (field && arg_action != ACTION_LIST) { |
| log_error("Option --field/-F only makes sense with list"); |
| return -EINVAL; |
| } |
| |
| while (optind < argc) { |
| r = add_match(matches, argv[optind]); |
| if (r != 0) |
| return r; |
| optind++; |
| } |
| |
| return 0; |
| } |
| |
| static int retrieve(const void *data, |
| size_t len, |
| const char *name, |
| const char **var) { |
| |
| size_t ident; |
| |
| ident = strlen(name) + 1; /* name + "=" */ |
| |
| if (len < ident) |
| return 0; |
| |
| if (memcmp(data, name, ident - 1) != 0) |
| return 0; |
| |
| if (((const char*) data)[ident - 1] != '=') |
| return 0; |
| |
| *var = strndup((const char*)data + ident, len - ident); |
| if (!*var) |
| return log_oom(); |
| |
| return 0; |
| } |
| |
| static void print_field(FILE* file, sd_journal *j) { |
| _cleanup_free_ const char *value = NULL; |
| const void *d; |
| size_t l; |
| |
| assert(field); |
| |
| SD_JOURNAL_FOREACH_DATA(j, d, l) |
| retrieve(d, l, field, &value); |
| if (value) |
| fprintf(file, "%s\n", value); |
| } |
| |
| static int print_entry(FILE* file, sd_journal *j, int had_legend) { |
| _cleanup_free_ const char |
| *pid = NULL, *uid = NULL, *gid = NULL, |
| *sgnl = NULL, *exe = NULL; |
| const void *d; |
| size_t l; |
| usec_t t; |
| char buf[FORMAT_TIMESTAMP_MAX]; |
| int r; |
| |
| SD_JOURNAL_FOREACH_DATA(j, d, l) { |
| retrieve(d, l, "COREDUMP_PID", &pid); |
| retrieve(d, l, "COREDUMP_PID", &pid); |
| retrieve(d, l, "COREDUMP_UID", &uid); |
| retrieve(d, l, "COREDUMP_GID", &gid); |
| retrieve(d, l, "COREDUMP_SIGNAL", &sgnl); |
| retrieve(d, l, "COREDUMP_EXE", &exe); |
| if (!exe) |
| retrieve(d, l, "COREDUMP_COMM", &exe); |
| if (!exe) |
| retrieve(d, l, "COREDUMP_CMDLINE", &exe); |
| } |
| |
| if (!pid && !uid && !gid && !sgnl && !exe) { |
| log_warning("Empty coredump log entry"); |
| return -EINVAL; |
| } |
| |
| r = sd_journal_get_realtime_usec(j, &t); |
| if (r < 0) { |
| log_error("Failed to get realtime timestamp: %s", strerror(-r)); |
| return r; |
| } |
| |
| format_timestamp(buf, sizeof(buf), t); |
| |
| if (!had_legend && !arg_no_legend) |
| fprintf(file, "%-*s %*s %*s %*s %*s %s\n", |
| FORMAT_TIMESTAMP_MAX-1, "TIME", |
| 6, "PID", |
| 5, "UID", |
| 5, "GID", |
| 3, "SIG", |
| "EXE"); |
| |
| fprintf(file, "%*s %*s %*s %*s %*s %s\n", |
| FORMAT_TIMESTAMP_MAX-1, buf, |
| 6, pid, |
| 5, uid, |
| 5, gid, |
| 3, sgnl, |
| exe); |
| |
| return 0; |
| } |
| |
| static int dump_list(sd_journal *j) { |
| int found = 0; |
| |
| assert(j); |
| |
| /* The coredumps are likely to compressed, and for just |
| * listing them we don't need to decompress them, so let's |
| * pick a fairly low data threshold here */ |
| sd_journal_set_data_threshold(j, 4096); |
| |
| SD_JOURNAL_FOREACH(j) { |
| if (field) |
| print_field(stdout, j); |
| else |
| print_entry(stdout, j, found++); |
| } |
| |
| if (!field && !found) { |
| log_notice("No coredumps found"); |
| return -ESRCH; |
| } |
| |
| return 0; |
| } |
| |
| static int focus(sd_journal *j) { |
| int r; |
| |
| r = sd_journal_seek_tail(j); |
| if (r == 0) |
| r = sd_journal_previous(j); |
| if (r < 0) { |
| log_error("Failed to search journal: %s", strerror(-r)); |
| return r; |
| } |
| if (r == 0) { |
| log_error("No match found"); |
| return -ESRCH; |
| } |
| return r; |
| } |
| |
| static int dump_core(sd_journal* j) { |
| const void *data; |
| size_t len, ret; |
| int r; |
| |
| assert(j); |
| |
| /* We want full data, nothing truncated. */ |
| sd_journal_set_data_threshold(j, 0); |
| |
| r = focus(j); |
| if (r < 0) |
| return r; |
| |
| print_entry(output ? stdout : stderr, j, false); |
| |
| if (on_tty() && !output) { |
| log_error("Refusing to dump core to tty"); |
| return -ENOTTY; |
| } |
| |
| r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len); |
| if (r < 0) { |
| log_error("Failed to retrieve COREDUMP field: %s", strerror(-r)); |
| return r; |
| } |
| |
| assert(len >= 9); |
| data = (const uint8_t*) data + 9; |
| len -= 9; |
| |
| ret = fwrite(data, len, 1, output ? output : stdout); |
| if (ret != 1) { |
| log_error("dumping coredump: %m (%zu)", ret); |
| return -errno; |
| } |
| |
| r = sd_journal_previous(j); |
| if (r >= 0) |
| log_warning("More than one entry matches, ignoring rest."); |
| |
| return 0; |
| } |
| |
| static int run_gdb(sd_journal *j) { |
| char path[] = "/var/tmp/coredump-XXXXXX"; |
| const void *data; |
| size_t len; |
| ssize_t sz; |
| pid_t pid; |
| _cleanup_free_ char *exe = NULL; |
| int r; |
| _cleanup_close_ int fd = -1; |
| siginfo_t st; |
| |
| assert(j); |
| |
| sd_journal_set_data_threshold(j, 0); |
| |
| r = focus(j); |
| if (r < 0) |
| return r; |
| |
| print_entry(stdout, j, false); |
| |
| r = sd_journal_get_data(j, "COREDUMP_EXE", (const void**) &data, &len); |
| if (r < 0) { |
| log_error("Failed to retrieve COREDUMP_EXE field: %s", strerror(-r)); |
| return r; |
| } |
| |
| assert(len >= 13); |
| data = (const uint8_t*) data + 13; |
| len -= 13; |
| |
| exe = strndup(data, len); |
| if (!exe) |
| return log_oom(); |
| |
| if (endswith(exe, " (deleted)")) { |
| log_error("Binary already deleted."); |
| return -ENOENT; |
| } |
| |
| r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len); |
| if (r < 0) { |
| log_error("Failed to retrieve COREDUMP field: %s", strerror(-r)); |
| return r; |
| } |
| |
| assert(len >= 9); |
| data = (const uint8_t*) data + 9; |
| len -= 9; |
| |
| fd = mkostemp_safe(path, O_WRONLY|O_CLOEXEC); |
| if (fd < 0) { |
| log_error("Failed to create temporary file: %m"); |
| return -errno; |
| } |
| |
| sz = write(fd, data, len); |
| if (sz < 0) { |
| log_error("Failed to write temporary file: %m"); |
| r = -errno; |
| goto finish; |
| } |
| if (sz != (ssize_t) len) { |
| log_error("Short write to temporary file."); |
| r = -EIO; |
| goto finish; |
| } |
| |
| close_nointr_nofail(fd); |
| fd = -1; |
| |
| pid = fork(); |
| if (pid < 0) { |
| log_error("Failed to fork(): %m"); |
| r = -errno; |
| goto finish; |
| } |
| if (pid == 0) { |
| execlp("gdb", "gdb", exe, path, NULL); |
| log_error("Failed to invoke gdb: %m"); |
| _exit(1); |
| } |
| |
| r = wait_for_terminate(pid, &st); |
| if (r < 0) { |
| log_error("Failed to wait for gdb: %m"); |
| goto finish; |
| } |
| |
| r = st.si_code == CLD_EXITED ? st.si_status : 255; |
| |
| finish: |
| unlink(path); |
| return r; |
| } |
| |
| int main(int argc, char *argv[]) { |
| _cleanup_journal_close_ sd_journal*j = NULL; |
| const char* match; |
| Iterator it; |
| int r = 0; |
| _cleanup_set_free_free_ Set *matches = NULL; |
| |
| setlocale(LC_ALL, ""); |
| log_parse_environment(); |
| log_open(); |
| |
| matches = new_matches(); |
| if (!matches) { |
| r = -ENOMEM; |
| goto end; |
| } |
| |
| r = parse_argv(argc, argv, matches); |
| if (r < 0) |
| goto end; |
| |
| if (arg_action == ACTION_NONE) |
| goto end; |
| |
| r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY); |
| if (r < 0) { |
| log_error("Failed to open journal: %s", strerror(-r)); |
| goto end; |
| } |
| |
| SET_FOREACH(match, matches, it) { |
| r = sd_journal_add_match(j, match, strlen(match)); |
| if (r != 0) { |
| log_error("Failed to add match '%s': %s", |
| match, strerror(-r)); |
| goto end; |
| } |
| } |
| |
| if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) { |
| _cleanup_free_ char *filter; |
| |
| filter = journal_make_match_string(j); |
| log_debug("Journal filter: %s", filter); |
| } |
| |
| switch(arg_action) { |
| |
| case ACTION_LIST: |
| if (!arg_no_pager) |
| pager_open(false); |
| |
| r = dump_list(j); |
| break; |
| |
| case ACTION_DUMP: |
| r = dump_core(j); |
| break; |
| |
| case ACTION_GDB: |
| r = run_gdb(j); |
| break; |
| |
| default: |
| assert_not_reached("Shouldn't be here"); |
| } |
| |
| end: |
| pager_close(); |
| |
| if (output) |
| fclose(output); |
| |
| return r >= 0 ? r : EXIT_FAILURE; |
| } |