chiark / gitweb /
journal: allow callers to specify OBJECT_PID=
[elogind.git] / src / journal / journald-server.c
index 0bf557c809e3dbc056e24a0a5db330d04fdc6c63..ae65f028956c633daaa1a7819b58f63b590b33ae 100644 (file)
@@ -245,7 +245,7 @@ finish:
 }
 
 static JournalFile* find_journal(Server *s, uid_t uid) {
-        char *p;
+        _cleanup_free_ char *p = NULL;
         int r;
         JournalFile *f;
         sd_id128_t machine;
@@ -282,9 +282,7 @@ static JournalFile* find_journal(Server *s, uid_t uid) {
                 journal_file_close(f);
         }
 
-        r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, s->system_journal, &f);
-        free(p);
-
+        r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &f);
         if (r < 0)
                 return s->system_journal;
 
@@ -372,7 +370,6 @@ void server_sync(Server *s) {
 }
 
 void server_vacuum(Server *s) {
-        char *p;
         char ids[33];
         sd_id128_t machine;
         int r;
@@ -390,29 +387,19 @@ void server_vacuum(Server *s) {
         sd_id128_to_string(machine, ids);
 
         if (s->system_journal) {
-                p = strappend("/var/log/journal/", ids);
-                if (!p) {
-                        log_oom();
-                        return;
-                }
+                char *p = strappenda("/var/log/journal/", ids);
 
                 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free, s->max_retention_usec, &s->oldest_file_usec);
                 if (r < 0 && r != -ENOENT)
                         log_error("Failed to vacuum %s: %s", p, strerror(-r));
-                free(p);
         }
 
         if (s->runtime_journal) {
-                p = strappend("/run/log/journal/", ids);
-                if (!p) {
-                        log_oom();
-                        return;
-                }
+                char *p = strappenda("/run/log/journal/", ids);
 
                 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free, s->max_retention_usec, &s->oldest_file_usec);
                 if (r < 0 && r != -ENOENT)
                         log_error("Failed to vacuum %s: %s", p, strerror(-r));
-                free(p);
         }
 
         s->cached_available_space_timestamp = 0;
@@ -478,7 +465,12 @@ static void write_to_journal(Server *s, uid_t uid, struct iovec *iovec, unsigned
         }
 
         if (vacuumed || !shall_try_append_again(f, r)) {
-                log_error("Failed to write entry, ignoring: %s", strerror(-r));
+                size_t size = 0;
+                unsigned i;
+                for (i = 0; i < n; i++)
+                        size += iovec[i].iov_len;
+
+                log_error("Failed to write entry (%d items, %zu bytes), ignoring: %s", n, size, strerror(-r));
                 return;
         }
 
@@ -491,8 +483,14 @@ static void write_to_journal(Server *s, uid_t uid, struct iovec *iovec, unsigned
 
         log_debug("Retrying write.");
         r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
-        if (r < 0)
-                log_error("Failed to write entry, ignoring: %s", strerror(-r));
+        if (r < 0) {
+                size_t size = 0;
+                unsigned i;
+                for (i = 0; i < n; i++)
+                        size += iovec[i].iov_len;
+
+                log_error("Failed to write entry (%d items, %zu bytes) despite vacuuming, ignoring: %s", n, size, strerror(-r));
+        }
 }
 
 static void dispatch_message_real(
@@ -501,24 +499,33 @@ static void dispatch_message_real(
                 struct ucred *ucred,
                 struct timeval *tv,
                 const char *label, size_t label_len,
-                const char *unit_id) {
+                const char *unit_id,
+                pid_t object_pid) {
 
-        char pid[sizeof("_PID=") + DECIMAL_STR_MAX(pid_t)],
+        char    pid[sizeof("_PID=") + DECIMAL_STR_MAX(pid_t)],
                 uid[sizeof("_UID=") + DECIMAL_STR_MAX(uid_t)],
                 gid[sizeof("_GID=") + DECIMAL_STR_MAX(gid_t)],
                 owner_uid[sizeof("_SYSTEMD_OWNER_UID=") + DECIMAL_STR_MAX(uid_t)],
                 source_time[sizeof("_SOURCE_REALTIME_TIMESTAMP=") + DECIMAL_STR_MAX(usec_t)],
                 boot_id[sizeof("_BOOT_ID=") + 32] = "_BOOT_ID=",
-                machine_id[sizeof("_MACHINE_ID=") + 32] = "_MACHINE_ID=";
-        char *comm, *exe, *cmdline, *cgroup, *session, *unit, *hostname;
+                machine_id[sizeof("_MACHINE_ID=") + 32] = "_MACHINE_ID=",
+                o_uid[sizeof("OBJECT_UID=") + DECIMAL_STR_MAX(uid_t)],
+                o_gid[sizeof("OBJECT_GID=") + DECIMAL_STR_MAX(gid_t)],
+                o_owner_uid[sizeof("OBJECT_SYSTEMD_OWNER_UID=") + DECIMAL_STR_MAX(uid_t)];
+        uid_t object_uid;
+        gid_t object_gid;
+
+        char *x;
         sd_id128_t id;
         int r;
         char *t, *c;
         uid_t realuid = 0, owner = 0, journal_uid;
         bool owner_valid = false;
 #ifdef HAVE_AUDIT
-        char audit_session[sizeof("_AUDIT_SESSION=") + DECIMAL_STR_MAX(uint32_t)],
-                audit_loginuid[sizeof("_AUDIT_LOGINUID=") + DECIMAL_STR_MAX(uid_t)];
+        char    audit_session[sizeof("_AUDIT_SESSION=") + DECIMAL_STR_MAX(uint32_t)],
+                audit_loginuid[sizeof("_AUDIT_LOGINUID=") + DECIMAL_STR_MAX(uid_t)],
+                o_audit_session[sizeof("OBJECT_AUDIT_SESSION=") + DECIMAL_STR_MAX(uint32_t)],
+                o_audit_loginuid[sizeof("OBJECT_AUDIT_LOGINUID=") + DECIMAL_STR_MAX(uid_t)];
 
         uint32_t audit;
         uid_t loginuid;
@@ -527,7 +534,7 @@ static void dispatch_message_real(
         assert(s);
         assert(iovec);
         assert(n > 0);
-        assert(n + N_IOVEC_META_FIELDS <= m);
+        assert(n + N_IOVEC_META_FIELDS + (object_pid ? N_IOVEC_OBJECT_FIELDS : 0) <= m);
 
         if (ucred) {
                 realuid = ucred->uid;
@@ -543,23 +550,23 @@ static void dispatch_message_real(
 
                 r = get_process_comm(ucred->pid, &t);
                 if (r >= 0) {
-                        comm = strappenda("_COMM=", t);
+                        x = strappenda("_COMM=", t);
                         free(t);
-                        IOVEC_SET_STRING(iovec[n++], comm);
+                        IOVEC_SET_STRING(iovec[n++], x);
                 }
 
                 r = get_process_exe(ucred->pid, &t);
                 if (r >= 0) {
-                        exe = strappenda("_EXE=", t);
+                        x = strappenda("_EXE=", t);
                         free(t);
-                        IOVEC_SET_STRING(iovec[n++], exe);
+                        IOVEC_SET_STRING(iovec[n++], x);
                 }
 
                 r = get_process_cmdline(ucred->pid, 0, false, &t);
                 if (r >= 0) {
-                        cmdline = strappenda("_CMDLINE=", t);
+                        x = strappenda("_CMDLINE=", t);
                         free(t);
-                        IOVEC_SET_STRING(iovec[n++], cmdline);
+                        IOVEC_SET_STRING(iovec[n++], x);
                 }
 
 #ifdef HAVE_AUDIT
@@ -578,8 +585,10 @@ static void dispatch_message_real(
 
                 r = cg_pid_get_path_shifted(ucred->pid, NULL, &c);
                 if (r >= 0) {
-                        cgroup = strappenda("_SYSTEMD_CGROUP=", c);
-                        IOVEC_SET_STRING(iovec[n++], cgroup);
+                        char *session = NULL;
+
+                        x = strappenda("_SYSTEMD_CGROUP=", c);
+                        IOVEC_SET_STRING(iovec[n++], x);
 
                         r = cg_path_get_session(c, &t);
                         if (r >= 0) {
@@ -596,43 +605,126 @@ static void dispatch_message_real(
                         }
 
                         if (cg_path_get_unit(c, &t) >= 0) {
-                                unit = strappenda("_SYSTEMD_UNIT=", t);
+                                x = strappenda("_SYSTEMD_UNIT=", t);
                                 free(t);
                         } else if (cg_path_get_user_unit(c, &t) >= 0) {
-                                unit = strappenda("_SYSTEMD_USER_UNIT=", t);
+                                x = strappenda("_SYSTEMD_USER_UNIT=", t);
                                 free(t);
                         } else if (unit_id) {
                                 if (session)
-                                        unit = strappenda("_SYSTEMD_USER_UNIT=", unit_id);
+                                        x = strappenda("_SYSTEMD_USER_UNIT=", unit_id);
                                 else
-                                        unit = strappenda("_SYSTEMD_UNIT=", unit_id);
+                                        x = strappenda("_SYSTEMD_UNIT=", unit_id);
                         } else
-                                unit = NULL;
+                                x = NULL;
 
-                        if (unit)
-                                IOVEC_SET_STRING(iovec[n++], unit);
+                        if (x)
+                                IOVEC_SET_STRING(iovec[n++], x);
 
                         free(c);
                 }
 
 #ifdef HAVE_SELINUX
                 if (label) {
-                        char *selinux_context = alloca(sizeof("_SELINUX_CONTEXT=") + label_len);
+                        x = alloca(sizeof("_SELINUX_CONTEXT=") + label_len);
 
-                        *((char*) mempcpy(stpcpy(selinux_context, "_SELINUX_CONTEXT="), label, label_len)) = 0;
-                        IOVEC_SET_STRING(iovec[n++], selinux_context);
+                        *((char*) mempcpy(stpcpy(x, "_SELINUX_CONTEXT="), label, label_len)) = 0;
+                        IOVEC_SET_STRING(iovec[n++], x);
                 } else {
                         security_context_t con;
 
                         if (getpidcon(ucred->pid, &con) >= 0) {
-                                char *selinux_context = strappenda("_SELINUX_CONTEXT=", con);
+                                x = strappenda("_SELINUX_CONTEXT=", con);
 
                                 freecon(con);
-                                IOVEC_SET_STRING(iovec[n++], selinux_context);
+                                IOVEC_SET_STRING(iovec[n++], x);
                         }
                 }
 #endif
         }
+        assert(n <= m);
+
+        if (object_pid) {
+                r = get_process_uid(object_pid, &object_uid);
+                if (r >= 0) {
+                        sprintf(o_uid, "OBJECT_UID=%lu", (unsigned long) object_uid);
+                        IOVEC_SET_STRING(iovec[n++], o_uid);
+                }
+
+                r = get_process_gid(object_pid, &object_gid);
+                if (r >= 0) {
+                        sprintf(o_gid, "OBJECT_GID=%lu", (unsigned long) object_gid);
+                        IOVEC_SET_STRING(iovec[n++], o_gid);
+                }
+
+                r = get_process_comm(object_pid, &t);
+                if (r >= 0) {
+                        x = strappenda("OBJECT_COMM=", t);
+                        free(t);
+                        IOVEC_SET_STRING(iovec[n++], x);
+                }
+
+                r = get_process_exe(object_pid, &t);
+                if (r >= 0) {
+                        x = strappenda("OBJECT_EXE=", t);
+                        free(t);
+                        IOVEC_SET_STRING(iovec[n++], x);
+                }
+
+                r = get_process_cmdline(object_pid, 0, false, &t);
+                if (r >= 0) {
+                        x = strappenda("OBJECT_CMDLINE=", t);
+                        free(t);
+                        IOVEC_SET_STRING(iovec[n++], x);
+                }
+
+#ifdef HAVE_AUDIT
+                r = audit_session_from_pid(object_pid, &audit);
+                if (r >= 0) {
+                        sprintf(o_audit_session, "OBJECT_AUDIT_SESSION=%lu", (unsigned long) audit);
+                        IOVEC_SET_STRING(iovec[n++], o_audit_session);
+                }
+
+                r = audit_loginuid_from_pid(object_pid, &loginuid);
+                if (r >= 0) {
+                        sprintf(o_audit_loginuid, "OBJECT_AUDIT_LOGINUID=%lu", (unsigned long) loginuid);
+                        IOVEC_SET_STRING(iovec[n++], o_audit_loginuid);
+                }
+#endif
+
+                r = cg_pid_get_path_shifted(object_pid, NULL, &c);
+                if (r >= 0) {
+                        x = strappenda("OBJECT_SYSTEMD_CGROUP=", c);
+                        IOVEC_SET_STRING(iovec[n++], x);
+
+                        r = cg_path_get_session(c, &t);
+                        if (r >= 0) {
+                                x = strappenda("OBJECT_SYSTEMD_SESSION=", t);
+                                free(t);
+                                IOVEC_SET_STRING(iovec[n++], x);
+                        }
+
+                        if (cg_path_get_owner_uid(c, &owner) >= 0) {
+                                sprintf(o_owner_uid, "OBJECT_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner);
+                                IOVEC_SET_STRING(iovec[n++], o_owner_uid);
+                        }
+
+                        if (cg_path_get_unit(c, &t) >= 0) {
+                                x = strappenda("OBJECT_SYSTEMD_UNIT=", t);
+                                free(t);
+                        } else if (cg_path_get_user_unit(c, &t) >= 0) {
+                                x = strappenda("OBJECT_SYSTEMD_USER_UNIT=", t);
+                                free(t);
+                        } else
+                                x = NULL;
+
+                        if (x)
+                                IOVEC_SET_STRING(iovec[n++], x);
+
+                        free(c);
+                }
+        }
+        assert(n <= m);
 
         if (tv) {
                 sprintf(source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu", (unsigned long long) timeval_load(tv));
@@ -644,21 +736,21 @@ static void dispatch_message_real(
          * anyway. However, we need this indexed, too. */
         r = sd_id128_get_boot(&id);
         if (r >= 0) {
-                sd_id128_to_string(id, boot_id + sizeof("_BOOT_ID=") - 1);
+                sd_id128_to_string(id, boot_id + strlen("_BOOT_ID="));
                 IOVEC_SET_STRING(iovec[n++], boot_id);
         }
 
         r = sd_id128_get_machine(&id);
         if (r >= 0) {
-                sd_id128_to_string(id, machine_id + sizeof("_MACHINE_ID=") - 1);
+                sd_id128_to_string(id, machine_id + strlen("_MACHINE_ID="));
                 IOVEC_SET_STRING(iovec[n++], machine_id);
         }
 
         t = gethostname_malloc();
         if (t) {
-                hostname = strappenda("_HOSTNAME=", t);
+                x = strappenda("_HOSTNAME=", t);
                 free(t);
-                IOVEC_SET_STRING(iovec[n++], hostname);
+                IOVEC_SET_STRING(iovec[n++], x);
         }
 
         assert(n <= m);
@@ -711,7 +803,7 @@ void server_driver_message(Server *s, sd_id128_t message_id, const char *format,
         ucred.uid = getuid();
         ucred.gid = getgid();
 
-        dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0, NULL);
+        dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0, NULL, 0);
 }
 
 void server_dispatch_message(
@@ -721,7 +813,8 @@ void server_dispatch_message(
                 struct timeval *tv,
                 const char *label, size_t label_len,
                 const char *unit_id,
-                int priority) {
+                int priority,
+                pid_t object_pid) {
 
         int rl, r;
         _cleanup_free_ char *path = NULL;
@@ -771,7 +864,7 @@ void server_dispatch_message(
                                       "Suppressed %u messages from %s", rl - 1, path);
 
 finish:
-        dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len, unit_id);
+        dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len, unit_id, object_pid);
 }
 
 
@@ -780,9 +873,6 @@ static int system_journal_open(Server *s) {
         char *fn;
         sd_id128_t machine;
         char ids[33];
-        uint64_t avail;
-
-        avail = available_space(s);
 
         r = sd_id128_get_machine(&machine);
         if (r < 0)
@@ -803,27 +893,23 @@ static int system_journal_open(Server *s) {
                 if (s->storage == STORAGE_PERSISTENT)
                         (void) mkdir("/var/log/journal/", 0755);
 
-                fn = strappend("/var/log/journal/", ids);
-                if (!fn)
-                        return -ENOMEM;
-
+                fn = strappenda("/var/log/journal/", ids);
                 (void) mkdir(fn, 0755);
-                free(fn);
-
-                fn = strjoin("/var/log/journal/", ids, "/system.journal", NULL);
-                if (!fn)
-                        return -ENOMEM;
 
+                fn = strappenda(fn, "/system.journal");
                 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &s->system_journal);
-                free(fn);
 
                 if (r >= 0) {
                         char fb[FORMAT_BYTES_MAX];
+                        uint64_t avail;
 
                         server_fix_perms(s, s->system_journal, 0);
+
                         server_driver_message(s, SD_ID128_NULL, "Allowing system journal files to grow to %s.",
                                               format_bytes(fb, sizeof(fb), s->system_metrics.max_use));
 
+                        avail = available_space(s);
+
                         if (s->system_metrics.max_use > avail)
                                server_driver_message(s, SD_ID128_NULL, "Journal size currently limited to %s due to SystemKeepFree.",
                                                      format_bytes(fb, sizeof(fb), avail));
@@ -877,11 +963,14 @@ static int system_journal_open(Server *s) {
 
                 if (s->runtime_journal) {
                         char fb[FORMAT_BYTES_MAX];
+                        uint64_t avail;
 
                         server_fix_perms(s, s->runtime_journal, 0);
                         server_driver_message(s, SD_ID128_NULL, "Allowing runtime journal files to grow to %s.",
                                               format_bytes(fb, sizeof(fb), s->runtime_metrics.max_use));
 
+                        avail = available_space(s);
+
                         if (s->system_metrics.max_use > avail)
                                server_driver_message(s, SD_ID128_NULL, "Journal size currently limited to %s due to RuntimeKeepFree.",
                                                      format_bytes(fb, sizeof(fb), avail));