This source file includes following definitions.
- new_matches
- add_match
- help
- parse_argv
- retrieve
- print_field
- print_list
- print_info
- focus
- print_entry
- dump_list
- save_core
- dump_core
- run_gdb
- main
#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"
#include "copy.h"
#include "compress.h"
static enum {
ACTION_NONE,
ACTION_INFO,
ACTION_LIST,
ACTION_DUMP,
ACTION_GDB,
} arg_action = ACTION_LIST;
static const char* arg_field = NULL;
static int arg_no_pager = false;
static int arg_no_legend = false;
static int arg_one = false;
static FILE* output = NULL;
static Set *new_matches(void) {
Set *set;
char *tmp;
int r;
set = set_new(NULL);
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 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", strerror(-r));
goto fail;
}
return 0;
fail:
log_error("Failed to add match: %s", strerror(-r));
return r;
}
static void help(void) {
printf("%s [OPTIONS...]\n\n"
"List or retrieve coredumps from the journal.\n\n"
"Flags:\n"
" -h --help Show this help\n"
" --version Print version string\n"
" --no-pager Do not pipe output into a pager\n"
" --no-legend Do not print the column headers.\n"
" -1 Show information about most recent entry only\n"
" -F --field=FIELD List all values a certain field takes\n"
" -o --output=FILE Write output to FILE\n\n"
"Commands:\n"
" list [MATCHES...] List available coredumps (default)\n"
" info [MATCHES...] Show detailed information about one or more coredumps\n"
" dump [MATCHES...] Print first matching coredump to stdout\n"
" gdb [MATCHES...] Start gdb for the first matching coredump\n"
, program_invocation_short_name);
}
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:1", options, NULL)) >= 0)
switch(c) {
case 'h':
arg_action = ACTION_NONE;
help();
return 0;
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 (arg_field) {
log_error("cannot use --field/-F more than once");
return -EINVAL;
}
arg_field = optarg;
break;
case '1':
arg_one = true;
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 if (streq(cmd, "info"))
arg_action = ACTION_INFO;
else {
log_error("Unknown action '%s'", cmd);
return -EINVAL;
}
}
if (arg_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,
char **var) {
size_t ident;
char *v;
ident = strlen(name) + 1;
if (len < ident)
return 0;
if (memcmp(data, name, ident - 1) != 0)
return 0;
if (((const char*) data)[ident - 1] != '=')
return 0;
v = strndup((const char*)data + ident, len - ident);
if (!v)
return log_oom();
free(*var);
*var = v;
return 0;
}
static void print_field(FILE* file, sd_journal *j) {
_cleanup_free_ char *value = NULL;
const void *d;
size_t l;
assert(file);
assert(j);
assert(arg_field);
SD_JOURNAL_FOREACH_DATA(j, d, l)
retrieve(d, l, arg_field, &value);
if (value)
fprintf(file, "%s\n", value);
}
static int print_list(FILE* file, sd_journal *j, int had_legend) {
_cleanup_free_ char
*pid = NULL, *uid = NULL, *gid = NULL,
*sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
*filename = NULL;
const void *d;
size_t l;
usec_t t;
char buf[FORMAT_TIMESTAMP_MAX];
int r;
bool present;
assert(file);
assert(j);
SD_JOURNAL_FOREACH_DATA(j, d, l) {
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);
retrieve(d, l, "COREDUMP_COMM", &comm);
retrieve(d, l, "COREDUMP_CMDLINE", &cmdline);
retrieve(d, l, "COREDUMP_FILENAME", &filename);
}
if (!pid && !uid && !gid && !sgnl && !exe && !comm && !cmdline && !filename) {
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);
present = filename && access(filename, F_OK) == 0;
if (!had_legend && !arg_no_legend)
fprintf(file, "%-*s %*s %*s %*s %*s %*s %s\n",
FORMAT_TIMESTAMP_WIDTH, "TIME",
6, "PID",
5, "UID",
5, "GID",
3, "SIG",
1, "PRESENT",
"EXE");
fprintf(file, "%-*s %*s %*s %*s %*s %*s %s\n",
FORMAT_TIMESTAMP_WIDTH, buf,
6, strna(pid),
5, strna(uid),
5, strna(gid),
3, strna(sgnl),
1, present ? "*" : "",
strna(exe ?: (comm ?: cmdline)));
return 0;
}
static int print_info(FILE *file, sd_journal *j, bool need_space) {
_cleanup_free_ char
*pid = NULL, *uid = NULL, *gid = NULL,
*sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
*unit = NULL, *user_unit = NULL, *session = NULL,
*boot_id = NULL, *machine_id = NULL, *hostname = NULL,
*slice = NULL, *cgroup = NULL, *owner_uid = NULL,
*message = NULL, *timestamp = NULL, *filename = NULL;
const void *d;
size_t l;
int r;
assert(file);
assert(j);
SD_JOURNAL_FOREACH_DATA(j, d, l) {
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);
retrieve(d, l, "COREDUMP_COMM", &comm);
retrieve(d, l, "COREDUMP_CMDLINE", &cmdline);
retrieve(d, l, "COREDUMP_UNIT", &unit);
retrieve(d, l, "COREDUMP_USER_UNIT", &user_unit);
retrieve(d, l, "COREDUMP_SESSION", &session);
retrieve(d, l, "COREDUMP_OWNER_UID", &owner_uid);
retrieve(d, l, "COREDUMP_SLICE", &slice);
retrieve(d, l, "COREDUMP_CGROUP", &cgroup);
retrieve(d, l, "COREDUMP_TIMESTAMP", ×tamp);
retrieve(d, l, "COREDUMP_FILENAME", &filename);
retrieve(d, l, "_BOOT_ID", &boot_id);
retrieve(d, l, "_MACHINE_ID", &machine_id);
retrieve(d, l, "_HOSTNAME", &hostname);
retrieve(d, l, "MESSAGE", &message);
}
if (need_space)
fputs("\n", file);
if (comm)
fprintf(file,
" PID: %s%s%s (%s)\n",
ansi_highlight(), strna(pid), ansi_highlight_off(), comm);
else
fprintf(file,
" PID: %s%s%s\n",
ansi_highlight(), strna(pid), ansi_highlight_off());
if (uid) {
uid_t n;
if (parse_uid(uid, &n) >= 0) {
_cleanup_free_ char *u = NULL;
u = uid_to_name(n);
fprintf(file,
" UID: %s (%s)\n",
uid, u);
} else {
fprintf(file,
" UID: %s\n",
uid);
}
}
if (gid) {
gid_t n;
if (parse_gid(gid, &n) >= 0) {
_cleanup_free_ char *g = NULL;
g = gid_to_name(n);
fprintf(file,
" GID: %s (%s)\n",
gid, g);
} else {
fprintf(file,
" GID: %s\n",
gid);
}
}
if (sgnl) {
int sig;
if (safe_atoi(sgnl, &sig) >= 0)
fprintf(file, " Signal: %s (%s)\n", sgnl, signal_to_string(sig));
else
fprintf(file, " Signal: %s\n", sgnl);
}
if (timestamp) {
usec_t u;
r = safe_atou64(timestamp, &u);
if (r >= 0) {
char absolute[FORMAT_TIMESTAMP_MAX], relative[FORMAT_TIMESPAN_MAX];
fprintf(file,
" Timestamp: %s (%s)\n",
format_timestamp(absolute, sizeof(absolute), u),
format_timestamp_relative(relative, sizeof(relative), u));
} else
fprintf(file, " Timestamp: %s\n", timestamp);
}
if (cmdline)
fprintf(file, " Command Line: %s\n", cmdline);
if (exe)
fprintf(file, " Executable: %s%s%s\n", ansi_highlight(), exe, ansi_highlight_off());
if (cgroup)
fprintf(file, " Control Group: %s\n", cgroup);
if (unit)
fprintf(file, " Unit: %s\n", unit);
if (user_unit)
fprintf(file, " User Unit: %s\n", unit);
if (slice)
fprintf(file, " Slice: %s\n", slice);
if (session)
fprintf(file, " Session: %s\n", session);
if (owner_uid) {
uid_t n;
if (parse_uid(owner_uid, &n) >= 0) {
_cleanup_free_ char *u = NULL;
u = uid_to_name(n);
fprintf(file,
" Owner UID: %s (%s)\n",
owner_uid, u);
} else {
fprintf(file,
" Owner UID: %s\n",
owner_uid);
}
}
if (boot_id)
fprintf(file, " Boot ID: %s\n", boot_id);
if (machine_id)
fprintf(file, " Machine ID: %s\n", machine_id);
if (hostname)
fprintf(file, " Hostname: %s\n", hostname);
if (filename && access(filename, F_OK) == 0)
fprintf(file, " Coredump: %s\n", filename);
if (message) {
_cleanup_free_ char *m = NULL;
m = strreplace(message, "\n", "\n ");
fprintf(file, " Message: %s\n", strstrip(m ?: message));
}
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 void print_entry(sd_journal *j, unsigned n_found) {
assert(j);
if (arg_action == ACTION_INFO)
print_info(stdout, j, n_found);
else if (arg_field)
print_field(stdout, j);
else
print_list(stdout, j, n_found);
}
static int dump_list(sd_journal *j) {
unsigned n_found = 0;
int r;
assert(j);
sd_journal_set_data_threshold(j, 4096);
if (arg_one) {
r = focus(j);
if (r < 0)
return r;
print_entry(j, 0);
} else {
SD_JOURNAL_FOREACH(j)
print_entry(j, n_found++);
if (!arg_field && n_found <= 0) {
log_notice("No coredumps found.");
return -ESRCH;
}
}
return 0;
}
static int save_core(sd_journal *j, int fd, char **path, bool *unlink_temp) {
const char *data;
_cleanup_free_ char *filename = NULL;
size_t len;
int r;
assert((fd >= 0) != !!path);
assert(!!path == !!unlink_temp);
r = sd_journal_get_data(j, "COREDUMP_FILENAME", (const void**) &data, &len);
if (r < 0 && r != -ENOENT)
log_warning("Failed to retrieve COREDUMP_FILENAME: %s", strerror(-r));
else if (r == 0)
retrieve(data, len, "COREDUMP_FILENAME", &filename);
if (filename && access(filename, R_OK) < 0) {
log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
"File %s is not readable: %m", filename);
free(filename);
filename = NULL;
}
if (filename && !endswith(filename, ".xz") && !endswith(filename, ".lz4")) {
if (path) {
*path = filename;
filename = NULL;
}
return 0;
} else {
_cleanup_close_ int fdt = -1;
char *temp = NULL;
if (fd < 0) {
temp = strdup("/var/tmp/coredump-XXXXXX");
if (!temp)
return log_oom();
fdt = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC);
if (fdt < 0) {
log_error("Failed to create temporary file: %m");
return -errno;
}
log_debug("Created temporary file %s", temp);
fd = fdt;
}
r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
if (r == 0) {
ssize_t sz;
assert(len >= 9);
data += 9;
len -= 9;
sz = write(fdt, data, len);
if (sz < 0) {
log_error("Failed to write temporary file: %m");
r = -errno;
goto error;
}
if (sz != (ssize_t) len) {
log_error("Short write to temporary file.");
r = -EIO;
goto error;
}
} else if (filename) {
#if defined(HAVE_XZ) || defined(HAVE_LZ4)
_cleanup_close_ int fdf;
fdf = open(filename, O_RDONLY | O_CLOEXEC);
if (fdf < 0) {
log_error("Failed to open %s: %m", filename);
r = -errno;
goto error;
}
r = decompress_stream(filename, fdf, fd, -1);
if (r < 0) {
log_error("Failed to decompress %s: %s", filename, strerror(-r));
goto error;
}
#else
log_error("Cannot decompress file. Compiled without compression support.");
r = -ENOTSUP;
goto error;
#endif
} else {
if (r == -ENOENT)
log_error("Cannot retrieve coredump from journal nor disk.");
else
log_error("Failed to retrieve COREDUMP field: %s", strerror(-r));
goto error;
}
if (temp) {
*path = temp;
*unlink_temp = true;
}
return 0;
error:
if (temp) {
unlink(temp);
log_debug("Removed temporary file %s", temp);
}
return r;
}
}
static int dump_core(sd_journal* j) {
int r;
assert(j);
r = focus(j);
if (r < 0)
return r;
print_info(output ? stdout : stderr, j, false);
if (on_tty() && !output) {
log_error("Refusing to dump core to tty.");
return -ENOTTY;
}
r = save_core(j, output ? fileno(output) : STDOUT_FILENO, NULL, NULL);
if (r < 0) {
log_error("Coredump retrieval failed: %s", strerror(-r));
return r;
}
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) {
_cleanup_free_ char *exe = NULL, *path = NULL;
bool unlink_path = false;
const char *data;
siginfo_t st;
size_t len;
pid_t pid;
int r;
assert(j);
r = focus(j);
if (r < 0)
return r;
print_info(stdout, j, false);
fputs("\n", stdout);
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 > strlen("COREDUMP_EXE="));
data += strlen("COREDUMP_EXE=");
len -= strlen("COREDUMP_EXE=");
exe = strndup(data, len);
if (!exe)
return log_oom();
if (endswith(exe, " (deleted)")) {
log_error("Binary already deleted.");
return -ENOENT;
}
if (!path_is_absolute(exe)) {
log_error("Binary is not an absolute path.");
return -ENOENT;
}
r = save_core(j, -1, &path, &unlink_path);
if (r < 0) {
log_error("Failed to retrieve core: %s", strerror(-r));
return r;
}
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:
if (unlink_path) {
log_debug("Removed temporary file %s", path);
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;
}
sd_journal_set_data_threshold(j, 0);
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:
case ACTION_INFO:
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;
}