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systemd/src/coredump/coredumpctl.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <fcntl.h>
#include <getopt.h>
#include <locale.h>
#include <stdio.h>
#include <unistd.h>
#include "sd-bus.h"
#include "sd-journal.h"
#include "sd-messages.h"
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-util.h"
#include "compress.h"
#include "def.h"
#include "fd-util.h"
#include "fs-util.h"
#include "journal-internal.h"
#include "journal-util.h"
#include "log.h"
#include "macro.h"
#include "main-func.h"
#include "pager.h"
#include "parse-util.h"
#include "path-util.h"
#include "pretty-print.h"
#include "process-util.h"
#include "rlimit-util.h"
#include "sigbus.h"
#include "signal-util.h"
#include "string-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "tmpfile-util.h"
#include "user-util.h"
#include "util.h"
#include "verbs.h"
#define SHORT_BUS_CALL_TIMEOUT_USEC (3 * USEC_PER_SEC)
static usec_t arg_since = USEC_INFINITY, arg_until = USEC_INFINITY;
static const char* arg_field = NULL;
static const char *arg_debugger = NULL;
static const char *arg_directory = NULL;
static PagerFlags arg_pager_flags = 0;
static int arg_no_legend = false;
static int arg_one = false;
static const char* arg_output = NULL;
static bool arg_reverse = false;
static bool arg_quiet = false;
static int add_match(sd_journal *j, const char *match) {
_cleanup_free_ char *p = NULL;
const char* prefix, *pattern;
pid_t pid;
int r;
if (strchr(match, '='))
prefix = "";
else if (strchr(match, '/')) {
r = path_make_absolute_cwd(match, &p);
if (r < 0)
return log_error_errno(r, "path_make_absolute_cwd(\"%s\"): %m", match);
match = p;
prefix = "COREDUMP_EXE=";
} else if (parse_pid(match, &pid) >= 0)
prefix = "COREDUMP_PID=";
else
prefix = "COREDUMP_COMM=";
pattern = strjoina(prefix, match);
log_debug("Adding match: %s", pattern);
r = sd_journal_add_match(j, pattern, 0);
if (r < 0)
return log_error_errno(r, "Failed to add match \"%s\": %m", match);
return 0;
}
static int add_matches(sd_journal *j, char **matches) {
char **match;
int r;
r = sd_journal_add_match(j, "MESSAGE_ID=" SD_MESSAGE_COREDUMP_STR, 0);
if (r < 0)
return log_error_errno(r, "Failed to add match \"%s\": %m", "MESSAGE_ID=" SD_MESSAGE_COREDUMP_STR);
r = sd_journal_add_match(j, "MESSAGE_ID=" SD_MESSAGE_BACKTRACE_STR, 0);
if (r < 0)
return log_error_errno(r, "Failed to add match \"%s\": %m", "MESSAGE_ID=" SD_MESSAGE_BACKTRACE_STR);
STRV_FOREACH(match, matches) {
r = add_match(j, *match);
if (r < 0)
return r;
}
return 0;
}
static int acquire_journal(sd_journal **ret, char **matches) {
_cleanup_(sd_journal_closep) sd_journal *j = NULL;
int r;
assert(ret);
if (arg_directory) {
r = sd_journal_open_directory(&j, arg_directory, 0);
if (r < 0)
return log_error_errno(r, "Failed to open journals in directory: %s: %m", arg_directory);
} else {
r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
if (r < 0)
return log_error_errno(r, "Failed to open journal: %m");
}
r = journal_access_check_and_warn(j, arg_quiet, true);
if (r < 0)
return r;
r = add_matches(j, matches);
if (r < 0)
return r;
if (DEBUG_LOGGING) {
_cleanup_free_ char *filter;
filter = journal_make_match_string(j);
log_debug("Journal filter: %s", filter);
}
*ret = TAKE_PTR(j);
return 0;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("coredumpctl", "1", &link);
if (r < 0)
return log_oom();
printf("%s%s [OPTIONS...]\n\n"
"List or retrieve coredumps from the journal.%s\n"
"\nCommands:\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"
" debug [MATCHES...] Start a debugger for the first matching coredump\n"
"\nFlags:\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"
" --debugger=DEBUGGER Use the given debugger\n"
" -1 Show information about most recent entry only\n"
" -S --since=DATE Only print coredumps since the date\n"
" -U --until=DATE Only print coredumps until the date\n"
" -r --reverse Show the newest entries first\n"
" -F --field=FIELD List all values a certain field takes\n"
" -o --output=FILE Write output to FILE\n"
" -D --directory=DIR Use journal files from directory\n\n"
" -q --quiet Do not show info messages and privilege warning\n"
"\nSee the %s for details.\n"
, ansi_highlight()
, program_invocation_short_name
, ansi_normal()
, link
);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_NO_PAGER,
ARG_NO_LEGEND,
ARG_DEBUGGER,
};
int c, r;
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 },
{ "debugger", required_argument, NULL, ARG_DEBUGGER },
{ "output", required_argument, NULL, 'o' },
{ "field", required_argument, NULL, 'F' },
{ "directory", required_argument, NULL, 'D' },
{ "reverse", no_argument, NULL, 'r' },
{ "since", required_argument, NULL, 'S' },
{ "until", required_argument, NULL, 'U' },
{ "quiet", no_argument, NULL, 'q' },
{}
};
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "ho:F:1D:rS:U:q", options, NULL)) >= 0)
switch(c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
case ARG_NO_LEGEND:
arg_no_legend = true;
break;
case ARG_DEBUGGER:
arg_debugger = optarg;
break;
case 'o':
if (arg_output)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Cannot set output more than once.");
arg_output = optarg;
break;
case 'S':
r = parse_timestamp(optarg, &arg_since);
if (r < 0)
return log_error_errno(r, "Failed to parse timestamp '%s': %m", optarg);
break;
case 'U':
r = parse_timestamp(optarg, &arg_until);
if (r < 0)
return log_error_errno(r, "Failed to parse timestamp '%s': %m", optarg);
break;
case 'F':
if (arg_field)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Cannot use --field/-F more than once.");
arg_field = optarg;
break;
case '1':
arg_one = true;
break;
case 'D':
arg_directory = optarg;
break;
case 'r':
arg_reverse = true;
break;
case 'q':
arg_quiet = true;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (arg_since != USEC_INFINITY && arg_until != USEC_INFINITY &&
arg_since > arg_until)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"--since= must be before --until=.");
return 1;
}
static int retrieve(const void *data,
size_t len,
const char *name,
char **var) {
size_t ident;
char *v;
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;
v = strndup((const char*)data + ident, len - ident);
if (!v)
return log_oom();
free_and_replace(*var, v);
return 1;
}
static int print_field(FILE* file, sd_journal *j) {
const void *d;
size_t l;
assert(file);
assert(j);
assert(arg_field);
/* A (user-specified) field may appear more than once for a given entry.
* We will print all of the occurrences.
* This is different below for fields that systemd-coredump uses,
* because they cannot meaningfully appear more than once.
*/
SD_JOURNAL_FOREACH_DATA(j, d, l) {
_cleanup_free_ char *value = NULL;
int r;
r = retrieve(d, l, arg_field, &value);
if (r < 0)
return r;
if (r > 0)
fprintf(file, "%s\n", value);
}
return 0;
}
#define RETRIEVE(d, l, name, arg) \
{ \
int _r = retrieve(d, l, name, &arg); \
if (_r < 0) \
return _r; \
if (_r > 0) \
continue; \
}
static int print_list(FILE* file, sd_journal *j, int had_legend) {
_cleanup_free_ char
*mid = NULL, *pid = NULL, *uid = NULL, *gid = NULL,
*sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
*filename = NULL, *truncated = NULL, *coredump = NULL;
const void *d;
size_t l;
usec_t t;
char buf[FORMAT_TIMESTAMP_MAX];
int r;
const char *present;
bool normal_coredump;
assert(file);
assert(j);
SD_JOURNAL_FOREACH_DATA(j, d, l) {
RETRIEVE(d, l, "MESSAGE_ID", mid);
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);
RETRIEVE(d, l, "COREDUMP_TRUNCATED", truncated);
RETRIEVE(d, l, "COREDUMP", coredump);
}
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)
return log_error_errno(r, "Failed to get realtime timestamp: %m");
format_timestamp(buf, sizeof(buf), t);
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",
9, "COREFILE",
"EXE");
normal_coredump = streq_ptr(mid, SD_MESSAGE_COREDUMP_STR);
if (filename)
if (access(filename, R_OK) == 0)
present = "present";
else if (errno == ENOENT)
present = "missing";
else
present = "error";
else if (coredump)
present = "journal";
else if (normal_coredump)
present = "none";
else
present = "-";
if (STR_IN_SET(present, "present", "journal") && truncated && parse_boolean(truncated) > 0)
present = "truncated";
fprintf(file, "%-*s %*s %*s %*s %*s %-*s %s\n",
FORMAT_TIMESTAMP_WIDTH, buf,
6, strna(pid),
5, strna(uid),
5, strna(gid),
3, normal_coredump ? strna(sgnl) : "-",
9, present,
strna(exe ?: (comm ?: cmdline)));
return 0;
}
static int print_info(FILE *file, sd_journal *j, bool need_space) {
_cleanup_free_ char
*mid = NULL, *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,
*truncated = NULL, *coredump = NULL;
const void *d;
size_t l;
bool normal_coredump;
int r;
assert(file);
assert(j);
SD_JOURNAL_FOREACH_DATA(j, d, l) {
RETRIEVE(d, l, "MESSAGE_ID", mid);
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", timestamp);
RETRIEVE(d, l, "COREDUMP_FILENAME", filename);
RETRIEVE(d, l, "COREDUMP_TRUNCATED", truncated);
RETRIEVE(d, l, "COREDUMP", coredump);
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);
normal_coredump = streq_ptr(mid, SD_MESSAGE_COREDUMP_STR);
if (comm)
fprintf(file,
" PID: %s%s%s (%s)\n",
ansi_highlight(), strna(pid), ansi_normal(), comm);
else
fprintf(file,
" PID: %s%s%s\n",
ansi_highlight(), strna(pid), ansi_normal());
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;
const char *name = normal_coredump ? "Signal" : "Reason";
if (normal_coredump && safe_atoi(sgnl, &sig) >= 0)
fprintf(file, " %s: %s (%s)\n", name, sgnl, signal_to_string(sig));
else
fprintf(file, " %s: %s\n", name, 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_normal());
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", user_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) {
bool inacc, trunc;
inacc = access(filename, R_OK) < 0;
trunc = truncated && parse_boolean(truncated) > 0;
if (inacc || trunc)
fprintf(file, " Storage: %s%s (%s%s%s)%s\n",
ansi_highlight_red(),
filename,
inacc ? "inaccessible" : "",
inacc && trunc ? ", " : "",
trunc ? "truncated" : "",
ansi_normal());
else
fprintf(file, " Storage: %s\n", filename);
}
else if (coredump)
fprintf(file, " Storage: journal\n");
else
fprintf(file, " Storage: none\n");
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)
return log_error_errno(r, "Failed to search journal: %m");
if (r == 0)
return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
"No match found.");
return r;
}
static int print_entry(sd_journal *j, unsigned n_found, bool verb_is_info) {
assert(j);
if (verb_is_info)
return print_info(stdout, j, n_found);
else if (arg_field)
return print_field(stdout, j);
else
return print_list(stdout, j, n_found);
}
static int dump_list(int argc, char **argv, void *userdata) {
_cleanup_(sd_journal_closep) sd_journal *j = NULL;
unsigned n_found = 0;
bool verb_is_info;
int r;
verb_is_info = (argc >= 1 && streq(argv[0], "info"));
r = acquire_journal(&j, argv + 1);
if (r < 0)
return r;
(void) pager_open(arg_pager_flags);
/* 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);
/* "info" without pattern implies "-1" */
if (arg_one || (verb_is_info && argc == 1)) {
r = focus(j);
if (r < 0)
return r;
return print_entry(j, 0, verb_is_info);
} else {
if (arg_since != USEC_INFINITY && !arg_reverse)
r = sd_journal_seek_realtime_usec(j, arg_since);
else if (arg_until != USEC_INFINITY && arg_reverse)
r = sd_journal_seek_realtime_usec(j, arg_until);
else if (arg_reverse)
r = sd_journal_seek_tail(j);
else
r = sd_journal_seek_head(j);
if (r < 0)
return log_error_errno(r, "Failed to seek to date: %m");
for (;;) {
if (!arg_reverse)
r = sd_journal_next(j);
else
r = sd_journal_previous(j);
if (r < 0)
return log_error_errno(r, "Failed to iterate through journal: %m");
if (r == 0)
break;
if (arg_until != USEC_INFINITY && !arg_reverse) {
usec_t usec;
r = sd_journal_get_realtime_usec(j, &usec);
if (r < 0)
return log_error_errno(r, "Failed to determine timestamp: %m");
if (usec > arg_until)
continue;
}
if (arg_since != USEC_INFINITY && arg_reverse) {
usec_t usec;
r = sd_journal_get_realtime_usec(j, &usec);
if (r < 0)
return log_error_errno(r, "Failed to determine timestamp: %m");
if (usec < arg_since)
continue;
}
r = print_entry(j, n_found++, verb_is_info);
if (r < 0)
return r;
}
if (!arg_field && n_found <= 0) {
if (!arg_quiet)
log_notice("No coredumps found.");
return -ESRCH;
}
}
return 0;
}
static int save_core(sd_journal *j, FILE *file, char **path, bool *unlink_temp) {
const char *data;
_cleanup_free_ char *filename = NULL;
size_t len;
int r, fd;
_cleanup_close_ int fdt = -1;
char *temp = NULL;
assert(!(file && path)); /* At most one can be specified */
assert(!!path == !!unlink_temp); /* Those must be specified together */
/* Look for a coredump on disk first. */
r = sd_journal_get_data(j, "COREDUMP_FILENAME", (const void**) &data, &len);
if (r == 0) {
r = retrieve(data, len, "COREDUMP_FILENAME", &filename);
if (r < 0)
return r;
assert(r > 0);
if (access(filename, R_OK) < 0)
return log_error_errno(errno, "File \"%s\" is not readable: %m", filename);
if (path && !endswith(filename, ".xz") && !endswith(filename, ".lz4")) {
*path = TAKE_PTR(filename);
return 0;
}
} else {
if (r != -ENOENT)
return log_error_errno(r, "Failed to retrieve COREDUMP_FILENAME field: %m");
/* Check that we can have a COREDUMP field. We still haven't set a high
* data threshold, so we'll get a few kilobytes at most.
*/
r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
if (r == -ENOENT)
return log_error_errno(r, "Coredump entry has no core attached (neither internally in the journal nor externally on disk).");
if (r < 0)
return log_error_errno(r, "Failed to retrieve COREDUMP field: %m");
}
if (path) {
const char *vt;
/* Create a temporary file to write the uncompressed core to. */
r = var_tmp_dir(&vt);
if (r < 0)
return log_error_errno(r, "Failed to acquire temporary directory path: %m");
temp = path_join(vt, "coredump-XXXXXX");
if (!temp)
return log_oom();
fdt = mkostemp_safe(temp);
if (fdt < 0)
return log_error_errno(fdt, "Failed to create temporary file: %m");
log_debug("Created temporary file %s", temp);
fd = fdt;
} else {
/* If neither path or file are specified, we will write to stdout. Let's now check
* if stdout is connected to a tty. We checked that the file exists, or that the
* core might be stored in the journal. In this second case, if we found the entry,
* in all likelihood we will be able to access the COREDUMP= field. In either case,
* we stop before doing any "real" work, i.e. before starting decompression or
* reading from the file or creating temporary files.
*/
if (!file) {
if (on_tty())
return log_error_errno(SYNTHETIC_ERRNO(ENOTTY),
"Refusing to dump core to tty"
" (use shell redirection or specify --output).");
file = stdout;
}
fd = fileno(file);
}
if (filename) {
#if HAVE_XZ || HAVE_LZ4
_cleanup_close_ int fdf;
fdf = open(filename, O_RDONLY | O_CLOEXEC);
if (fdf < 0) {
r = log_error_errno(errno, "Failed to open %s: %m", filename);
goto error;
}
r = decompress_stream(filename, fdf, fd, -1);
if (r < 0) {
log_error_errno(r, "Failed to decompress %s: %m", filename);
goto error;
}
#else
log_error("Cannot decompress file. Compiled without compression support.");
r = -EOPNOTSUPP;
goto error;
#endif
} else {
ssize_t sz;
/* We want full data, nothing truncated. */
sd_journal_set_data_threshold(j, 0);
r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
if (r < 0)
return log_error_errno(r, "Failed to retrieve COREDUMP field: %m");
assert(len >= 9);
data += 9;
len -= 9;
sz = write(fd, data, len);
if (sz < 0) {
r = log_error_errno(errno, "Failed to write output: %m");
goto error;
}
if (sz != (ssize_t) len) {
log_error("Short write to output.");
r = -EIO;
goto error;
}
}
if (temp) {
*path = temp;
*unlink_temp = true;
}
return 0;
error:
if (temp) {
(void) unlink(temp);
log_debug("Removed temporary file %s", temp);
}
return r;
}
static int dump_core(int argc, char **argv, void *userdata) {
_cleanup_(sd_journal_closep) sd_journal *j = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
if (arg_field) {
log_error("Option --field/-F only makes sense with list");
return -EINVAL;
}
r = acquire_journal(&j, argv + 1);
if (r < 0)
return r;
r = focus(j);
if (r < 0)
return r;
if (arg_output) {
f = fopen(arg_output, "we");
if (!f)
return log_error_errno(errno, "Failed to open \"%s\" for writing: %m", arg_output);
}
print_info(f ? stdout : stderr, j, false);
r = save_core(j, f, NULL, NULL);
if (r < 0)
return r;
r = sd_journal_previous(j);
if (r > 0 && !arg_quiet)
log_notice("More than one entry matches, ignoring rest.");
return 0;
}
static int run_debug(int argc, char **argv, void *userdata) {
_cleanup_(sd_journal_closep) sd_journal *j = NULL;
_cleanup_free_ char *exe = NULL, *path = NULL, *debugger = NULL;
bool unlink_path = false;
const char *data, *fork_name;
size_t len;
pid_t pid;
int r;
if (!arg_debugger) {
char *env_debugger;
env_debugger = getenv("SYSTEMD_DEBUGGER");
if (env_debugger)
arg_debugger = env_debugger;
else
arg_debugger = "gdb";
}
debugger = strdup(arg_debugger);
if (!debugger)
return -ENOMEM;
if (arg_field) {
log_error("Option --field/-F only makes sense with list");
return -EINVAL;
}
r = acquire_journal(&j, argv + 1);
if (r < 0)
return r;
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)
return log_error_errno(r, "Failed to retrieve COREDUMP_EXE field: %m");
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, NULL, &path, &unlink_path);
if (r < 0)
return r;
/* Don't interfere with gdb and its handling of SIGINT. */
(void) ignore_signals(SIGINT, -1);
fork_name = strjoina("(", debugger, ")");
r = safe_fork(fork_name, FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
if (r < 0)
goto finish;
if (r == 0) {
execlp(debugger, debugger, exe, "-c", path, NULL);
log_open();
log_error_errno(errno, "Failed to invoke %s: %m", debugger);
_exit(EXIT_FAILURE);
}
r = wait_for_terminate_and_check(debugger, pid, WAIT_LOG_ABNORMAL);
finish:
(void) default_signals(SIGINT, -1);
if (unlink_path) {
log_debug("Removed temporary file %s", path);
(void) unlink(path);
}
return r;
}
static int check_units_active(void) {
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
int c = 0, r;
const char *id, *state, *substate;
if (arg_quiet)
return false;
r = sd_bus_default_system(&bus);
if (r < 0)
return log_error_errno(r, "Failed to acquire bus: %m");
r = sd_bus_message_new_method_call(
bus,
&m,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"ListUnitsByPatterns");
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_message_append_strv(m, NULL);
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_message_append_strv(m, STRV_MAKE("systemd-coredump@*.service"));
if (r < 0)
return bus_log_create_error(r);
r = sd_bus_call(bus, m, SHORT_BUS_CALL_TIMEOUT_USEC, &error, &reply);
if (r < 0)
return log_error_errno(r, "Failed to check if any systemd-coredump@.service units are running: %s",
bus_error_message(&error, r));
r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssssouso)");
if (r < 0)
return bus_log_parse_error(r);
while ((r = sd_bus_message_read(
reply, "(ssssssouso)",
&id, NULL, NULL, &state, &substate,
NULL, NULL, NULL, NULL, NULL)) > 0) {
bool found = !STR_IN_SET(state, "inactive", "dead", "failed");
log_debug("Unit %s is %s/%s, %scounting it.", id, state, substate, found ? "" : "not ");
c += found;
}
if (r < 0)
return bus_log_parse_error(r);
r = sd_bus_message_exit_container(reply);
if (r < 0)
return bus_log_parse_error(r);
return c;
}
static int coredumpctl_main(int argc, char *argv[]) {
static const Verb verbs[] = {
{ "list", VERB_ANY, VERB_ANY, VERB_DEFAULT, dump_list },
{ "info", VERB_ANY, VERB_ANY, 0, dump_list },
{ "dump", VERB_ANY, VERB_ANY, 0, dump_core },
{ "debug", VERB_ANY, VERB_ANY, 0, run_debug },
{ "gdb", VERB_ANY, VERB_ANY, 0, run_debug },
{}
};
return dispatch_verb(argc, argv, verbs, NULL);
}
static int run(int argc, char *argv[]) {
int r, units_active;
setlocale(LC_ALL, "");
log_show_color(true);
log_parse_environment();
log_open();
/* The journal merging logic potentially needs a lot of fds. */
(void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
r = parse_argv(argc, argv);
if (r <= 0)
return r;
sigbus_install();
units_active = check_units_active(); /* error is treated the same as 0 */
r = coredumpctl_main(argc, argv);
if (units_active > 0)
printf("%s-- Notice: %d systemd-coredump@.service %s, output may be incomplete.%s\n",
ansi_highlight_red(),
units_active, units_active == 1 ? "unit is running" : "units are running",
ansi_normal());
return r;
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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