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-rw-r--r--src/journal/coredumpctl.c255
1 files changed, 182 insertions, 73 deletions
diff --git a/src/journal/coredumpctl.c b/src/journal/coredumpctl.c
index bf943bc032..db0f3d67cc 100644
--- a/src/journal/coredumpctl.c
+++ b/src/journal/coredumpctl.c
@@ -36,6 +36,7 @@
#include "pager.h"
#include "macro.h"
#include "journal-internal.h"
+#include "copy.h"
static enum {
ACTION_NONE,
@@ -45,7 +46,7 @@ static enum {
} arg_action = ACTION_LIST;
static FILE* output = NULL;
-static char* field = NULL;
+static char* arg_field = NULL;
static int arg_no_pager = false;
static int arg_no_legend = false;
@@ -79,21 +80,21 @@ static Set *new_matches(void) {
}
static int help(void) {
- printf("%s [OPTIONS...] [MATCHES...]\n\n"
+
+ printf("%s [OPTIONS...]\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"
+ " -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"
+ " -h --help Show this help\n"
+ " --version Print version string\n"
+ " -F --field=FIELD List all values a certain field takes\n"
+ " list [MATCHES...] List available 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);
return 0;
@@ -198,12 +199,12 @@ static int parse_argv(int argc, char *argv[], Set *matches) {
break;
case 'F':
- if (field) {
+ if (arg_field) {
log_error("cannot use --field/-F more than once");
return -EINVAL;
}
- field = optarg;
+ arg_field = optarg;
break;
case '?':
@@ -227,7 +228,7 @@ static int parse_argv(int argc, char *argv[], Set *matches) {
}
}
- if (field && arg_action != ACTION_LIST) {
+ if (arg_field && arg_action != ACTION_LIST) {
log_error("Option --field/-F only makes sense with list");
return -EINVAL;
}
@@ -245,9 +246,10 @@ static int parse_argv(int argc, char *argv[], Set *matches) {
static int retrieve(const void *data,
size_t len,
const char *name,
- const char **var) {
+ char **var) {
size_t ident;
+ char *v;
ident = strlen(name) + 1; /* name + "=" */
@@ -260,30 +262,34 @@ static int retrieve(const void *data,
if (((const char*) data)[ident - 1] != '=')
return 0;
- *var = strndup((const char*)data + ident, len - ident);
- if (!*var)
+ 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_ const char *value = NULL;
+ _cleanup_free_ char *value = NULL;
const void *d;
size_t l;
- assert(field);
+ assert(arg_field);
SD_JOURNAL_FOREACH_DATA(j, d, l)
- retrieve(d, l, field, &value);
+ retrieve(d, l, arg_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
+ _cleanup_free_ char
*pid = NULL, *uid = NULL, *gid = NULL,
- *sgnl = NULL, *exe = NULL;
+ *sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL;
const void *d;
size_t l;
usec_t t;
@@ -292,18 +298,15 @@ static int print_entry(FILE* file, sd_journal *j, int had_legend) {
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);
+ retrieve(d, l, "COREDUMP_COMM", &comm);
+ retrieve(d, l, "COREDUMP_CMDLINE", &cmdline);
}
- if (!pid && !uid && !gid && !sgnl && !exe) {
+ if (!pid && !uid && !gid && !sgnl && !exe && !comm && !cmdline) {
log_warning("Empty coredump log entry");
return -EINVAL;
}
@@ -327,11 +330,11 @@ static int print_entry(FILE* file, sd_journal *j, int had_legend) {
fprintf(file, "%*s %*s %*s %*s %*s %s\n",
FORMAT_TIMESTAMP_MAX-1, buf,
- 6, pid,
- 5, uid,
- 5, gid,
- 3, sgnl,
- exe);
+ 6, strna(pid),
+ 5, strna(uid),
+ 5, strna(gid),
+ 3, strna(sgnl),
+ strna(exe ?: (comm ?: cmdline)));
return 0;
}
@@ -347,13 +350,13 @@ static int dump_list(sd_journal *j) {
sd_journal_set_data_threshold(j, 4096);
SD_JOURNAL_FOREACH(j) {
- if (field)
+ if (arg_field)
print_field(stdout, j);
else
print_entry(stdout, j, found++);
}
- if (!field && !found) {
+ if (!arg_field && !found) {
log_notice("No coredumps found");
return -ESRCH;
}
@@ -378,6 +381,55 @@ static int focus(sd_journal *j) {
return r;
}
+#define filename_escape(s) xescape((s), "./")
+
+static int make_coredump_path(sd_journal *j, char **ret) {
+ _cleanup_free_ char
+ *pid = NULL, *boot_id = NULL, *tstamp = NULL, *comm = NULL,
+ *p = NULL, *b = NULL, *t = NULL, *c = NULL;
+ const void *d;
+ size_t l;
+ char *fn;
+
+ assert(j);
+ assert(ret);
+
+ SD_JOURNAL_FOREACH_DATA(j, d, l) {
+ retrieve(d, l, "COREDUMP_COMM", &comm);
+ retrieve(d, l, "COREDUMP_PID", &pid);
+ retrieve(d, l, "COREDUMP_TIMESTAMP", &tstamp);
+ retrieve(d, l, "_BOOT_ID", &boot_id);
+ }
+
+ if (!pid || !comm || !tstamp || !boot_id) {
+ log_error("Failed to retrieve necessary fields to find coredump on disk.");
+ return -ENOENT;
+ }
+
+ p = filename_escape(pid);
+ if (!p)
+ return log_oom();
+
+ t = filename_escape(tstamp);
+ if (!t)
+ return log_oom();
+
+ c = filename_escape(comm);
+ if (!t)
+ return log_oom();
+
+ b = filename_escape(boot_id);
+ if (!b)
+ return log_oom();
+
+ fn = strjoin("/var/lib/systemd/coredump/core.", c, ".", b, ".", p, ".", t, NULL);
+ if (!fn)
+ return log_oom();
+
+ *ret = fn;
+ return 0;
+}
+
static int dump_core(sd_journal* j) {
const void *data;
size_t len, ret;
@@ -400,19 +452,44 @@ static int dump_core(sd_journal* j) {
}
r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
- if (r < 0) {
+ if (r == ENOENT) {
+ _cleanup_free_ char *fn = NULL;
+ _cleanup_close_ int fd = -1;
+
+ r = make_coredump_path(j, &fn);
+ if (r < 0)
+ return r;
+
+ fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0) {
+ if (errno == ENOENT)
+ log_error("Coredump neither in journal file nor stored externally on disk.");
+ else
+ log_error("Failed to open coredump file: %s", strerror(-r));
+
+ return -errno;
+ }
+
+ r = copy_bytes(fd, output ? fileno(output) : STDOUT_FILENO);
+ if (r < 0) {
+ log_error("Failed to stream coredump: %s", strerror(-r));
+ return r;
+ }
+
+ } else 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;
+ } else {
+ 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;
+ ret = fwrite(data, len, 1, output ?: stdout);
+ if (ret != 1) {
+ log_error("Dumping coredump failed: %m (%zu)", ret);
+ return -errno;
+ }
}
r = sd_journal_previous(j);
@@ -423,15 +500,16 @@ static int dump_core(sd_journal* j) {
}
static int run_gdb(sd_journal *j) {
- char path[] = "/var/tmp/coredump-XXXXXX";
+
+ _cleanup_free_ char *exe = NULL, *coredump = NULL;
+ char temp[] = "/var/tmp/coredump-XXXXXX";
+ bool unlink_temp = false;
+ const char *path;
const void *data;
+ siginfo_t st;
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);
@@ -462,35 +540,63 @@ static int run_gdb(sd_journal *j) {
return -ENOENT;
}
+ if (!path_is_absolute(exe)) {
+ log_error("Binary is not an absolute path.");
+ return -ENOENT;
+ }
+
r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
- if (r < 0) {
+ if (r == -ENOENT) {
+
+ r = make_coredump_path(j, &coredump);
+ if (r < 0)
+ return r;
+
+ if (access(coredump, R_OK) < 0) {
+ if (errno == ENOENT)
+ log_error("Coredump neither in journal file nor stored externally on disk.");
+ else
+ log_error("Failed to access coredump fiile: %s", strerror(-r));
+
+ return -errno;
+ }
+
+ path = coredump;
+
+ } else 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;
+ } else {
+ _cleanup_close_ int fd = -1;
+ ssize_t sz;
- fd = mkostemp_safe(path, O_WRONLY|O_CLOEXEC);
- if (fd < 0) {
- log_error("Failed to create temporary file: %m");
- return -errno;
- }
+ assert(len >= 9);
+ data = (const uint8_t*) data + 9;
+ len -= 9;
- 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;
- }
+ fd = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC);
+ if (fd < 0) {
+ log_error("Failed to create temporary file: %m");
+ return -errno;
+ }
+
+ unlink_temp = true;
+
+ 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;
+ }
- fd = safe_close(fd);
+ path = temp;
+ }
pid = fork();
if (pid < 0) {
@@ -500,6 +606,7 @@ static int run_gdb(sd_journal *j) {
}
if (pid == 0) {
execlp("gdb", "gdb", exe, path, NULL);
+
log_error("Failed to invoke gdb: %m");
_exit(1);
}
@@ -513,7 +620,9 @@ static int run_gdb(sd_journal *j) {
r = st.si_code == CLD_EXITED ? st.si_status : 255;
finish:
- unlink(path);
+ if (unlink_temp)
+ unlink(temp);
+
return r;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-24 22:32:24 +0000