chiark / gitweb /
bus: add new sd_bus_creds object to encapsulate process credentials
[elogind.git] / src / libsystemd-bus / busctl.c
index 88446fc..24db48a 100644 (file)
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <getopt.h>
+
+#include "strv.h"
+#include "util.h"
+#include "log.h"
+#include "build.h"
+#include "pager.h"
+
 #include "sd-bus.h"
+#include "bus-message.h"
+#include "bus-internal.h"
+#include "bus-util.h"
+#include "bus-dump.h"
 
-int main(int argc, char *argv[]) {
-        _cleanup_bus_unref_ sd_bus *bus = NULL;
+static bool arg_no_pager = false;
+static char *arg_address = NULL;
+static bool arg_no_unique = false;
+static char **arg_matches = NULL;
+static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
+static char *arg_host = NULL;
+static bool arg_user = false;
+
+static void pager_open_if_enabled(void) {
+
+        /* Cache result before we open the pager */
+        if (arg_no_pager)
+                return;
+
+        pager_open(false);
+}
+
+static int list_bus_names(sd_bus *bus, char **argv) {
         _cleanup_strv_free_ char **l = NULL;
         char **i;
         int r;
+        size_t max_i = 0;
 
-        r = bus_open_system(&bus);
-        if (r < 0) {
-                log_error("Failed to connect to bus: %s", strerror(-r));
-                goto fail;
-        }
+        assert(bus);
 
         r = sd_bus_list_names(bus, &l);
         if (r < 0) {
                 log_error("Failed to list names: %s", strerror(-r));
-                goto fail;
+                return r;
         }
 
+        pager_open_if_enabled();
+
+        strv_sort(l);
+
+        STRV_FOREACH(i, l)
+                max_i = MAX(max_i, strlen(*i));
+
+        printf("%-*s %*s %-*s %-*s %-*s MACHINE\n",
+               (int) max_i, "NAME", 10, "PID", 15, "PROCESS", 16, "USER", 20, "CONNECTION");
+
         STRV_FOREACH(i, l) {
+                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
                 _cleanup_free_ char *owner = NULL;
-                pid_t pid = 0;
-                uid_t uid;
-                bool uid_valid;
+                sd_id128_t mid;
 
-                r = sd_bus_get_owner(bus, *i, &owner);
-                if (r == -ENXIO)
+                if (arg_no_unique && (*i)[0] == ':')
                         continue;
 
-                r = sd_get_owner_pid(bus, *i, &pid);
-                if (r == -ENXIO)
+                printf("%-*s", (int) max_i, *i);
+
+                r = sd_bus_get_owner_creds(bus, *i, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_COMM, &creds);
+                if (r >= 0) {
+                        pid_t pid;
+                        uid_t uid;
+
+                        r = sd_bus_creds_get_pid(creds, &pid);
+                        if (r >= 0) {
+                                const char *comm = NULL;
+
+                                sd_bus_creds_get_comm(creds, &comm);
+
+                                printf(" %10lu %-15s", (unsigned long) pid, strna(comm));
+                        } else
+                                printf("          - -              ");
+
+                        r = sd_bus_creds_get_uid(creds, &uid);
+                        if (r >= 0) {
+                                _cleanup_free_ char *u = NULL;
+
+                                u = uid_to_name(uid);
+                                if (!u)
+                                        return log_oom();
+
+                                if (strlen(u) > 16)
+                                        u[16] = 0;
+
+                                printf(" %-16s", u);
+                        } else
+                                printf(" -               ");
+                } else
+                        printf("          - -               -               ");
+
+
+                r = sd_bus_get_owner(bus, *i, &owner);
+                if (r >= 0)
+                        printf(" %-20s", owner);
+                else
+                        printf(" -                   ");
+
+                r = sd_bus_get_owner_machine_id(bus, *i, &mid);
+                if (r >= 0) {
+                        char m[SD_ID128_STRING_MAX];
+                        printf(" %s\n", sd_id128_to_string(mid, m));
+                } else
+                        printf(" -\n");
+        }
+
+        return 0;
+}
+
+static int monitor(sd_bus *bus, char *argv[]) {
+        bool added_something = false;
+        char **i;
+        int r;
+
+        STRV_FOREACH(i, argv+1) {
+                _cleanup_free_ char *m = NULL;
+
+                if (!service_name_is_valid(*i)) {
+                        log_error("Invalid service name '%s'", *i);
+                        return -EINVAL;
+                }
+
+                m = strjoin("sender='", *i, "'", NULL);
+                if (!m)
+                        return log_oom();
+
+                r = sd_bus_add_match(bus, m, NULL, NULL);
+                if (r < 0) {
+                        log_error("Failed to add match: %s", strerror(-r));
+                        return r;
+                }
+
+                added_something = true;
+        }
+
+        STRV_FOREACH(i, arg_matches) {
+                r = sd_bus_add_match(bus, *i, NULL, NULL);
+                if (r < 0) {
+                        log_error("Failed to add match: %s", strerror(-r));
+                        return r;
+                }
+
+                added_something = true;
+        }
+
+        if (!added_something) {
+                r = sd_bus_add_match(bus, "", NULL, NULL);
+                if (r < 0) {
+                        log_error("Failed to add match: %s", strerror(-r));
+                        return r;
+                }
+        }
+
+        for (;;) {
+                _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+
+                r = sd_bus_process(bus, &m);
+                if (r < 0) {
+                        log_error("Failed to process bus: %s", strerror(-r));
+                        return r;
+                }
+
+                if (m) {
+                        bus_message_dump(m, stdout, true);
                         continue;
+                }
 
-                r = sd_get_owner_uid(bus, *i, &pid);
-                if (r == -ENXIO)
+                if (r > 0)
                         continue;
-                uid_valid = r >= 0;
 
-                printf("%s (%s) %llu %llu\n", *i, owner, (unsigned long long) pid, (unsigned long long) uid);
+                r = sd_bus_wait(bus, (uint64_t) -1);
+                if (r < 0) {
+                        log_error("Failed to wait for bus: %s", strerror(-r));
+                        return r;
+                }
         }
 
-        r = 0;
+        return -EINVAL;
+}
+
+static int help(void) {
+
+        printf("%s [OPTIONS...] {COMMAND} ...\n\n"
+               "Introspect the bus.\n\n"
+               "  -h --help               Show this help\n"
+               "     --version            Show package version\n"
+               "     --no-pager           Do not pipe output into a pager\n"
+               "     --system             Connect to system bus\n"
+               "     --user               Connect to user bus\n"
+               "  -H --host=[USER@]HOST   Operate on remote host\n"
+               "  -M --machine=CONTAINER  Operate on local container\n"
+               "     --address=ADDRESS    Connect to bus specified by address\n"
+               "     --no-unique          Only show well-known names\n"
+               "     --match=MATCH        Only show matching messages\n\n"
+               "Commands:\n"
+               "  list                    List bus names\n"
+               "  monitor [SERVICE...]    Show bus traffic\n",
+               program_invocation_short_name);
+
+        return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+        enum {
+                ARG_VERSION = 0x100,
+                ARG_NO_PAGER,
+                ARG_SYSTEM,
+                ARG_USER,
+                ARG_ADDRESS,
+                ARG_MATCH,
+                ARG_NO_UNIQUE
+        };
+
+        static const struct option options[] = {
+                { "help",      no_argument,       NULL, 'h'           },
+                { "version",   no_argument,       NULL, ARG_VERSION   },
+                { "no-pager",  no_argument,       NULL, ARG_NO_PAGER  },
+                { "system",    no_argument,       NULL, ARG_SYSTEM    },
+                { "user",      no_argument,       NULL, ARG_USER      },
+                { "address",   required_argument, NULL, ARG_ADDRESS   },
+                { "no-unique", no_argument,       NULL, ARG_NO_UNIQUE },
+                { "match",     required_argument, NULL, ARG_MATCH     },
+                { "host",      required_argument, NULL, 'H'           },
+                { "machine",   required_argument, NULL, 'M'           },
+                {},
+        };
+
+        int c;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "hH:M:", options, NULL)) >= 0) {
+
+                switch (c) {
+
+                case 'h':
+                        return help();
+
+                case ARG_VERSION:
+                        puts(PACKAGE_STRING);
+                        puts(SYSTEMD_FEATURES);
+                        return 0;
+
+                case ARG_NO_PAGER:
+                        arg_no_pager = true;
+                        break;
+
+                case ARG_USER:
+                        arg_user = true;
+                        break;
+
+                case ARG_SYSTEM:
+                        arg_user = false;
+                        break;
+
+                case ARG_ADDRESS:
+                        arg_address = optarg;
+                        break;
+
+                case ARG_NO_UNIQUE:
+                        arg_no_unique = true;
+                        break;
+
+                case ARG_MATCH:
+                        if (strv_extend(&arg_matches, optarg) < 0)
+                                return log_oom();
+                        break;
+
+                case 'H':
+                        arg_transport = BUS_TRANSPORT_REMOTE;
+                        arg_host = optarg;
+                        break;
+
+                case 'M':
+                        arg_transport = BUS_TRANSPORT_CONTAINER;
+                        arg_host = optarg;
+                        break;
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        assert_not_reached("Unhandled option");
+                }
+        }
+
+        return 1;
+}
+
+static int busctl_main(sd_bus *bus, int argc, char *argv[]) {
+        assert(bus);
+
+        if (optind >= argc ||
+            streq(argv[optind], "list"))
+                return list_bus_names(bus, argv + optind);
+
+        if (streq(argv[optind], "monitor"))
+                return monitor(bus, argv + optind);
+
+        if (streq(argv[optind], "help"))
+                return help();
+
+        log_error("Unknown command '%s'", argv[optind]);
+        return -EINVAL;
+}
+
+int main(int argc, char *argv[]) {
+        _cleanup_bus_unref_ sd_bus *bus = NULL;
+        int r;
+
+        log_parse_environment();
+        log_open();
+
+        r = parse_argv(argc, argv);
+        if (r <= 0)
+                goto finish;
+
+        if (arg_address) {
+                r = sd_bus_new(&bus);
+                if (r < 0) {
+                        log_error("Failed to allocate bus: %s", strerror(-r));
+                        goto finish;
+                }
+
+                r = sd_bus_set_address(bus, arg_address);
+                if (r < 0) {
+                        log_error("Failed to set address: %s", strerror(-r));
+                        goto finish;
+                }
+
+                r = sd_bus_set_bus_client(bus, true);
+                if (r < 0) {
+                        log_error("Failed to set bus client: %s", strerror(-r));
+                        goto finish;
+                }
+
+                r = sd_bus_start(bus);
+        } else
+                r = bus_open_transport(arg_transport, arg_host, arg_user, &bus);
+
+        if (r < 0) {
+                log_error("Failed to connect to bus: %s", strerror(-r));
+                goto finish;
+        }
+
+        r = busctl_main(bus, argc, argv);
+
+finish:
+        pager_close();
+
+        strv_free(arg_matches);
 
-fail:
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }