/*-*- 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_consume(set, pattern); if (r < 0) { log_error("Failed to add pattern '%s': %s", pattern, strerror(-r)); 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.\n"); 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(path, O_WRONLY); 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; }