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bus: if we hit the end of an array container return 0 as EOF indicator when reading it
[elogind.git] / src / libsystemd-bus / bus-message.c
diff --git a/src/libsystemd-bus/bus-message.c b/src/libsystemd-bus/bus-message.c
index 264a2f63f16b3ea4d5eb4623c5de7be49b81d385..511bdf503e78852430eccba3c49e8a0b8eebbfc2 100644 (file)
--- a/src/libsystemd-bus/bus-message.c
+++ b/src/libsystemd-bus/bus-message.c
@@ -461,7 +461,7 @@ int sd_bus_message_new_signal(
         if (bus && bus->state == BUS_UNSET)
                 return -ENOTCONN;
 
-        t = message_new(bus, SD_BUS_MESSAGE_TYPE_SIGNAL);
+        t = message_new(bus, SD_BUS_MESSAGE_SIGNAL);
         if (!t)
                 return -ENOMEM;
 
@@ -509,7 +509,7 @@ int sd_bus_message_new_method_call(
         if (bus && bus->state == BUS_UNSET)
                 return -ENOTCONN;
 
-        t = message_new(bus, SD_BUS_MESSAGE_TYPE_METHOD_CALL);
+        t = message_new(bus, SD_BUS_MESSAGE_METHOD_CALL);
         if (!t)
                 return -ENOMEM;
 
@@ -553,7 +553,7 @@ static int message_new_reply(
                 return -EINVAL;
         if (!call->sealed)
                 return -EPERM;
-        if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
+        if (call->header->type != SD_BUS_MESSAGE_METHOD_CALL)
                 return -EINVAL;
         if (!m)
                 return -EINVAL;
@@ -592,7 +592,7 @@ int sd_bus_message_new_method_return(
                 sd_bus_message *call,
                 sd_bus_message **m) {
 
-        return message_new_reply(bus, call, SD_BUS_MESSAGE_TYPE_METHOD_RETURN, m);
+        return message_new_reply(bus, call, SD_BUS_MESSAGE_METHOD_RETURN, m);
 }
 
 int sd_bus_message_new_method_error(
@@ -609,7 +609,7 @@ int sd_bus_message_new_method_error(
         if (!m)
                 return -EINVAL;
 
-        r = message_new_reply(bus, call, SD_BUS_MESSAGE_TYPE_METHOD_ERROR, &t);
+        r = message_new_reply(bus, call, SD_BUS_MESSAGE_METHOD_ERROR, &t);
         if (r < 0)
                 return r;
 
@@ -639,47 +639,60 @@ int sd_bus_message_new_method_errorf(
                 const char *format,
                 ...) {
 
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        sd_bus_message *t;
+        _cleanup_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
         va_list ap;
         int r;
 
-        if (!name)
-                return -EINVAL;
-        if (!m)
-                return -EINVAL;
+        assert_return(name, -EINVAL);
+        assert_return(m, -EINVAL);
+
+        va_start(ap, format);
+        r = bus_error_setfv(&error, name, format, ap);
+        va_end(ap);
 
-        r = message_new_reply(bus, call, SD_BUS_MESSAGE_TYPE_METHOD_ERROR, &t);
         if (r < 0)
                 return r;
 
-        r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, name, &t->error.name);
-        if (r < 0)
-                goto fail;
+        return sd_bus_message_new_method_error(bus, call, &error, m);
+}
 
-        if (format) {
-                _cleanup_free_ char *message = NULL;
+int sd_bus_message_new_method_errno(
+                sd_bus *bus,
+                sd_bus_message *call,
+                int error,
+                const sd_bus_error *p,
+                sd_bus_message **m) {
 
-                va_start(ap, format);
-                r = vasprintf(&message, format, ap);
-                va_end(ap);
+        _cleanup_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
 
-                if (r < 0) {
-                        r = -ENOMEM;
-                        goto fail;
-                }
+        if (sd_bus_error_is_set(p))
+                return sd_bus_message_new_method_error(bus, call, p, m);
 
-                r = message_append_basic(t, SD_BUS_TYPE_STRING, message, (const void**) &t->error.message);
-                if (r < 0)
-                        goto fail;
-        }
+        sd_bus_error_set_errno(&berror, error);
 
-        *m = t;
-        return 0;
+        return sd_bus_message_new_method_error(bus, call, &berror, m);
+}
 
-fail:
-        message_free(t);
-        return r;
+int sd_bus_message_new_method_errnof(
+                sd_bus *bus,
+                sd_bus_message *call,
+                sd_bus_message **m,
+                int error,
+                const char *format,
+                ...) {
+
+        _cleanup_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
+        va_list ap;
+        int r;
+
+        va_start(ap, format);
+        r = bus_error_set_errnofv(&berror, error, format, ap);
+        va_end(ap);
+
+        if (r < 0)
+                return r;
+
+        return sd_bus_message_new_method_error(bus, call, &berror, m);
 }
 
 int bus_message_new_synthetic_error(
@@ -694,7 +707,7 @@ int bus_message_new_synthetic_error(
         assert(sd_bus_error_is_set(e));
         assert(m);
 
-        t = message_new(bus, SD_BUS_MESSAGE_TYPE_METHOD_ERROR);
+        t = message_new(bus, SD_BUS_MESSAGE_METHOD_ERROR);
         if (!t)
                 return -ENOMEM;
 
@@ -790,7 +803,7 @@ int sd_bus_message_get_no_reply(sd_bus_message *m) {
         if (!m)
                 return -EINVAL;
 
-        return m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL ? !!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) : 0;
+        return m->header->type == SD_BUS_MESSAGE_METHOD_CALL ? !!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) : 0;
 }
 
 const char *sd_bus_message_get_path(sd_bus_message *m) {
@@ -1127,7 +1140,7 @@ int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const cha
         if (!m)
                 return -EINVAL;
 
-        if (m->header->type != SD_BUS_MESSAGE_TYPE_SIGNAL)
+        if (m->header->type != SD_BUS_MESSAGE_SIGNAL)
                 return 0;
 
         if (interface && (!m->interface || !streq(m->interface, interface)))
@@ -1143,7 +1156,7 @@ int sd_bus_message_is_method_call(sd_bus_message *m, const char *interface, cons
         if (!m)
                 return -EINVAL;
 
-        if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
+        if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
                 return 0;
 
         if (interface && (!m->interface || !streq(m->interface, interface)))
@@ -1159,7 +1172,7 @@ int sd_bus_message_is_method_error(sd_bus_message *m, const char *name) {
         if (!m)
                 return -EINVAL;
 
-        if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR)
+        if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
                 return 0;
 
         if (name && (!m->error.name || !streq(m->error.name, name)))
@@ -1173,7 +1186,7 @@ int sd_bus_message_set_no_reply(sd_bus_message *m, int b) {
                 return -EINVAL;
         if (m->sealed)
                 return -EPERM;
-        if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
+        if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
                 return -EPERM;
 
         if (b)
@@ -1285,7 +1298,7 @@ static int part_make_space(
 
                 part->munmap_this = true;
         } else {
-                n = realloc(part->data, sz);
+                n = realloc(part->data, MAX(sz, 1u));
                 if (!n) {
                         m->poisoned = true;
                         return -ENOMEM;
@@ -2304,14 +2317,10 @@ int sd_bus_message_append_string_memfd(sd_bus_message *m, sd_memfd *memfd) {
         void *a;
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!memfd)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (m->poisoned)
-                return -ESTALE;
+        assert_return(m, -EINVAL);
+        assert_return(memfd, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(!m->poisoned, -ESTALE);
 
         r = sd_memfd_set_sealed(memfd, true);
         if (r < 0)
@@ -2376,6 +2385,27 @@ int sd_bus_message_append_string_memfd(sd_bus_message *m, sd_memfd *memfd) {
         return 0;
 }
 
+int sd_bus_message_append_strv(sd_bus_message *m, char **l) {
+        char **i;
+        int r;
+
+        assert_return(m, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(!m->poisoned, -ESTALE);
+
+        r = sd_bus_message_open_container(m, 'a', "s");
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(i, l) {
+                r = sd_bus_message_append_basic(m, 's', *i);
+                if (r < 0)
+                        return r;
+        }
+
+        return sd_bus_message_close_container(m);
+}
+
 int bus_body_part_map(struct bus_body_part *part) {
         void *p;
         size_t psz;
@@ -2629,6 +2659,9 @@ int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
         if (!c->signature || c->signature[c->index] == 0)
                 return 0;
 
+        if (message_end_of_array(m, m->rindex))
+                return 0;
+
         if (c->signature[c->index] != type)
                 return -ENXIO;
 
@@ -2977,6 +3010,9 @@ int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *con
         if (!c->signature || c->signature[c->index] == 0)
                 return 0;
 
+        if (message_end_of_array(m, m->rindex))
+                return 0;
+
         signature = strdup(contents);
         if (!signature)
                 return -ENOMEM;
@@ -3860,25 +3896,25 @@ int bus_message_parse_fields(sd_bus_message *m) {
 
         switch (m->header->type) {
 
-        case SD_BUS_MESSAGE_TYPE_SIGNAL:
+        case SD_BUS_MESSAGE_SIGNAL:
                 if (!m->path || !m->interface || !m->member)
                         return -EBADMSG;
                 break;
 
-        case SD_BUS_MESSAGE_TYPE_METHOD_CALL:
+        case SD_BUS_MESSAGE_METHOD_CALL:
 
                 if (!m->path || !m->member)
                         return -EBADMSG;
 
                 break;
 
-        case SD_BUS_MESSAGE_TYPE_METHOD_RETURN:
+        case SD_BUS_MESSAGE_METHOD_RETURN:
 
                 if (m->reply_serial == 0)
                         return -EBADMSG;
                 break;
 
-        case SD_BUS_MESSAGE_TYPE_METHOD_ERROR:
+        case SD_BUS_MESSAGE_METHOD_ERROR:
 
                 if (m->reply_serial == 0 || !m->error.name)
                         return -EBADMSG;
@@ -3886,7 +3922,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
         }
 
         /* Try to read the error message, but if we can't it's a non-issue */
-        if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR)
+        if (m->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
                 sd_bus_message_read(m, "s", &m->error.message);
 
         return 0;
@@ -4347,24 +4383,21 @@ int bus_header_message_size(struct bus_header *h, size_t *sum) {
         return 0;
 }
 
-int bus_message_to_errno(sd_bus_message *m) {
-        assert(m);
+int sd_bus_message_get_errno(sd_bus_message *m) {
+        assert_return(m, -EINVAL);
 
-        if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR)
+        if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
                 return 0;
 
-        return bus_error_to_errno(&m->error);
+        return sd_bus_error_get_errno(&m->error);
 }
 
-int sd_bus_message_get_signature(sd_bus_message *m, int complete, const char **signature) {
+const char* sd_bus_message_get_signature(sd_bus_message *m, int complete) {
         struct bus_container *c;
 
         if (!m)
-                return -EINVAL;
-        if (!signature)
-                return -EINVAL;
+                return NULL;
 
         c = complete ? &m->root_container : message_get_container(m);
-        *signature = c->signature ?: "";
-        return 0;
+        return c->signature ?: "";
 }
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