#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

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;

}