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Diffstat (limited to 'src/coredump/coredumpctl.c')
-rw-r--r--src/coredump/coredumpctl.c349
1 files changed, 205 insertions, 144 deletions
diff --git a/src/coredump/coredumpctl.c b/src/coredump/coredumpctl.c
index 27b1e0fb3f..0e5351e621 100644
--- a/src/coredump/coredumpctl.c
+++ b/src/coredump/coredumpctl.c
@@ -30,6 +30,7 @@
#include "compress.h"
#include "fd-util.h"
#include "fileio.h"
+#include "fs-util.h"
#include "journal-internal.h"
#include "log.h"
#include "macro.h"
@@ -279,11 +280,10 @@ static int retrieve(const void *data,
free(*var);
*var = v;
- return 0;
+ return 1;
}
-static void print_field(FILE* file, sd_journal *j) {
- _cleanup_free_ char *value = NULL;
+static int print_field(FILE* file, sd_journal *j) {
const void *d;
size_t l;
@@ -292,37 +292,59 @@ static void print_field(FILE* file, sd_journal *j) {
assert(arg_field);
- SD_JOURNAL_FOREACH_DATA(j, d, l)
- retrieve(d, l, arg_field, &value);
+ /* A (user-specified) field may appear more than once for a given entry.
+ * We will print all of the occurences.
+ * 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);
+ }
- if (value)
- 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
*pid = NULL, *uid = NULL, *gid = NULL,
*sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
- *filename = NULL;
+ *filename = NULL, *coredump = NULL;
const void *d;
size_t l;
usec_t t;
char buf[FORMAT_TIMESTAMP_MAX];
int r;
- bool present;
+ const char *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);
+ 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", coredump);
}
if (!pid && !uid && !gid && !sgnl && !exe && !comm && !cmdline && !filename) {
@@ -335,7 +357,6 @@ static int print_list(FILE* file, sd_journal *j, int had_legend) {
return log_error_errno(r, "Failed to get realtime timestamp: %m");
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",
@@ -344,16 +365,28 @@ static int print_list(FILE* file, sd_journal *j, int had_legend) {
5, "UID",
5, "GID",
3, "SIG",
- 1, "PRESENT",
+ 8, "COREFILE",
"EXE");
- fprintf(file, "%-*s %*s %*s %*s %*s %*s %s\n",
+ 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
+ present = "none";
+
+ 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 ? "*" : "",
+ 8, present,
strna(exe ?: (comm ?: cmdline)));
return 0;
@@ -366,7 +399,8 @@ static int print_info(FILE *file, sd_journal *j, bool need_space) {
*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;
+ *message = NULL, *timestamp = NULL, *filename = NULL,
+ *coredump = NULL;
const void *d;
size_t l;
int r;
@@ -375,25 +409,26 @@ static int print_info(FILE *file, sd_journal *j, bool need_space) {
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", &timestamp);
- 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);
+ 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", 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)
@@ -476,7 +511,7 @@ static int print_info(FILE *file, sd_journal *j, bool need_space) {
if (unit)
fprintf(file, " Unit: %s\n", unit);
if (user_unit)
- fprintf(file, " User Unit: %s\n", unit);
+ fprintf(file, " User Unit: %s\n", user_unit);
if (slice)
fprintf(file, " Slice: %s\n", slice);
if (session)
@@ -504,8 +539,13 @@ static int print_info(FILE *file, sd_journal *j, bool need_space) {
if (hostname)
fprintf(file, " Hostname: %s\n", hostname);
- if (filename && access(filename, F_OK) == 0)
- fprintf(file, " Coredump: %s\n", filename);
+ if (filename)
+ fprintf(file, " Storage: %s%s\n", filename,
+ access(filename, R_OK) < 0 ? " (inaccessible)" : "");
+ else if (coredump)
+ fprintf(file, " Storage: journal\n");
+ else
+ fprintf(file, " Storage: none\n");
if (message) {
_cleanup_free_ char *m = NULL;
@@ -533,15 +573,15 @@ static int focus(sd_journal *j) {
return r;
}
-static void print_entry(sd_journal *j, unsigned n_found) {
+static int print_entry(sd_journal *j, unsigned n_found) {
assert(j);
if (arg_action == ACTION_INFO)
- print_info(stdout, j, n_found);
+ return print_info(stdout, j, n_found);
else if (arg_field)
- print_field(stdout, j);
+ return print_field(stdout, j);
else
- print_list(stdout, j, n_found);
+ return print_list(stdout, j, n_found);
}
static int dump_list(sd_journal *j) {
@@ -560,10 +600,13 @@ static int dump_list(sd_journal *j) {
if (r < 0)
return r;
- print_entry(j, 0);
+ return print_entry(j, 0);
} else {
- SD_JOURNAL_FOREACH(j)
- print_entry(j, n_found++);
+ SD_JOURNAL_FOREACH(j) {
+ r = print_entry(j, n_found++);
+ if (r < 0)
+ return r;
+ }
if (!arg_field && n_found <= 0) {
log_notice("No coredumps found.");
@@ -574,116 +617,142 @@ static int dump_list(sd_journal *j) {
return 0;
}
-static int save_core(sd_journal *j, int fd, char **path, bool *unlink_temp) {
+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;
+ int r, fd;
+ _cleanup_close_ int fdt = -1;
+ char *temp = NULL;
- assert((fd >= 0) != !!path);
- assert(!!path == !!unlink_temp);
+ assert(!(file && path)); /* At most one can be specified */
+ assert(!!path == !!unlink_temp); /* Those must be specified together */
- /* Prefer uncompressed file to journal (probably cached) to
- * compressed file (probably uncached). */
+ /* Look for a coredump on disk first. */
r = sd_journal_get_data(j, "COREDUMP_FILENAME", (const void**) &data, &len);
- if (r < 0 && r != -ENOENT)
- log_warning_errno(r, "Failed to retrieve COREDUMP_FILENAME: %m");
- else if (r == 0)
+ if (r == 0)
retrieve(data, len, "COREDUMP_FILENAME", &filename);
+ 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.
+ */
- if (filename && access(filename, R_OK) < 0) {
- log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
- "File %s is not readable: %m", filename);
- filename = mfree(filename);
+ 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 (filename && !endswith(filename, ".xz") && !endswith(filename, ".lz4")) {
- if (path) {
+ if (filename) {
+ 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 = filename;
filename = NULL;
+
+ return 0;
}
+ }
- return 0;
- } else {
- _cleanup_close_ int fdt = -1;
- char *temp = NULL;
+ if (path) {
+ const char *vt;
- if (fd < 0) {
- temp = strdup("/var/tmp/coredump-XXXXXX");
- if (!temp)
- return log_oom();
+ /* Create a temporary file to write the uncompressed core to. */
- fdt = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC);
- if (fdt < 0)
- return log_error_errno(fdt, "Failed to create temporary file: %m");
- log_debug("Created temporary file %s", temp);
+ r = var_tmp_dir(&vt);
+ if (r < 0)
+ return log_error_errno(r, "Failed to acquire temporary directory path: %m");
+
+ temp = strjoin(vt, "/coredump-XXXXXX", NULL);
+ if (!temp)
+ return log_oom();
- fd = fdt;
+ 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 likelyhood 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(ENOTTY, "Refusing to dump core to tty"
+ " (use shell redirection or specify --output).");
+ file = stdout;
}
- 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) {
- r = log_error_errno(errno,
- "Failed to write temporary file: %m");
- goto error;
- }
- if (sz != (ssize_t) len) {
- log_error("Short write to temporary file.");
- r = -EIO;
- goto error;
- }
- } else if (filename) {
+ fd = fileno(file);
+ }
+
+ if (filename) {
#if defined(HAVE_XZ) || defined(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;
- }
+ _cleanup_close_ int fdf;
- 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;
+ fdf = open(filename, O_RDONLY | O_CLOEXEC);
+ if (fdf < 0) {
+ r = log_error_errno(errno, "Failed to open %s: %m", filename);
goto error;
-#endif
- } else {
- if (r == -ENOENT)
- log_error("Cannot retrieve coredump from journal or disk.");
- else
- log_error_errno(r, "Failed to retrieve COREDUMP field: %m");
+ }
+
+ 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");
- if (temp) {
- *path = temp;
- *unlink_temp = true;
+ 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;
}
+ }
- return 0;
+ if (temp) {
+ *path = temp;
+ *unlink_temp = true;
+ }
+ return 0;
error:
- if (temp) {
- unlink(temp);
- log_debug("Removed temporary file %s", temp);
- }
- return r;
+ if (temp) {
+ unlink(temp);
+ log_debug("Removed temporary file %s", temp);
}
+ return r;
}
static int dump_core(sd_journal* j) {
@@ -697,17 +766,12 @@ static int dump_core(sd_journal* j) {
print_info(arg_output ? stdout : stderr, j, false);
- if (on_tty() && !arg_output) {
- log_error("Refusing to dump core to tty.");
- return -ENOTTY;
- }
-
- r = save_core(j, arg_output ? fileno(arg_output) : STDOUT_FILENO, NULL, NULL);
+ r = save_core(j, arg_output, NULL, NULL);
if (r < 0)
- return log_error_errno(r, "Coredump retrieval failed: %m");
+ return r;
r = sd_journal_previous(j);
- if (r >= 0)
+ if (r > 0)
log_warning("More than one entry matches, ignoring rest.");
return 0;
@@ -753,9 +817,9 @@ static int run_gdb(sd_journal *j) {
return -ENOENT;
}
- r = save_core(j, -1, &path, &unlink_path);
+ r = save_core(j, NULL, &path, &unlink_path);
if (r < 0)
- return log_error_errno(r, "Failed to retrieve core: %m");
+ return r;
pid = fork();
if (pid < 0) {
@@ -829,9 +893,6 @@ int main(int argc, char *argv[]) {
}
}
- /* We want full data, nothing truncated. */
- sd_journal_set_data_threshold(j, 0);
-
SET_FOREACH(match, matches, it) {
r = sd_journal_add_match(j, match, strlen(match));
if (r != 0) {
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-18 02:25:39 +0000