shaba/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd.git synced 2024-11-08 02:57:16 +03:00
Code
6a371e23ee
systemd/src/journal/coredumpctl.c
Daniel Buch f5f6d0e255 tree-wide usage of %m specifier instead of strerror(errno) 
Also for log_error() except where a specific error is specified

e.g. errno ? strerror(errno) : "Some user specified message"
2013-11-26 21:07:46 +10:00

595 lines
16 KiB
C
Raw Blame History

/*-*- 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;
}
View Git Blame Copy Permalink