sd-rtnl: add a bit more debugging in case a message is dropped

[elogind.git] / src / libsystemd / sd-rtnl / rtnl-message.c

diff --git a/src/libsystemd/sd-rtnl/rtnl-message.c b/src/libsystemd/sd-rtnl/rtnl-message.c
index 44ad303198a72942a40466829da479fd038ce76a..e5c72e765361b52edf395310195716b452234378 100644 (file)
--- a/src/libsystemd/sd-rtnl/rtnl-message.c
+++ b/src/libsystemd/sd-rtnl/rtnl-message.c
@@ -128,6 +128,21 @@ int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope) {
         return 0;
 }
 
+int sd_rtnl_message_route_get_family(sd_rtnl_message *m, int *family) {
+        struct rtmsg *rtm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(family, -EINVAL);
+
+        rtm = NLMSG_DATA(m->hdr);
+
+        *family = rtm->rtm_family;
+
+        return 0;
+}
+
 int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret,
                               uint16_t nlmsg_type, int rtm_family,
                               unsigned char rtm_protocol) {
@@ -815,6 +830,8 @@ int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const c
         int r;
         void *attr_data;
 
+        assert_return(m, -EINVAL);
+
         r = message_attribute_has_type(m, type, NLA_STRING);
         if (r < 0)
                 return r;
@@ -825,7 +842,8 @@ int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const c
         else if (strnlen(attr_data, r) >= (size_t) r)
                 return -EIO;
 
-        *data = (const char *) attr_data;
+        if (data)
+                *data = (const char *) attr_data;
 
         return 0;
 }
@@ -834,6 +852,8 @@ int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *da
         int r;
         void *attr_data;
 
+        assert_return(m, -EINVAL);
+
         r = message_attribute_has_type(m, type, NLA_U8);
         if (r < 0)
                 return r;
@@ -844,7 +864,8 @@ int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *da
         else if ((size_t) r < sizeof(uint8_t))
                 return -EIO;
 
-        *data = *(uint8_t *) attr_data;
+        if (data)
+                *data = *(uint8_t *) attr_data;
 
         return 0;
 }
@@ -853,6 +874,8 @@ int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *
         int r;
         void *attr_data;
 
+        assert_return(m, -EINVAL);
+
         r = message_attribute_has_type(m, type, NLA_U16);
         if (r < 0)
                 return r;
@@ -863,7 +886,8 @@ int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *
         else if ((size_t) r < sizeof(uint16_t))
                 return -EIO;
 
-        *data = *(uint16_t *) attr_data;
+        if (data)
+                *data = *(uint16_t *) attr_data;
 
         return 0;
 }
@@ -872,6 +896,8 @@ int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *
         int r;
         void *attr_data;
 
+        assert_return(m, -EINVAL);
+
         r = message_attribute_has_type(m, type, NLA_U32);
         if (r < 0)
                 return r;
@@ -882,7 +908,8 @@ int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *
         else if ((size_t)r < sizeof(uint32_t))
                 return -EIO;
 
-        *data = *(uint32_t *) attr_data;
+        if (data)
+                *data = *(uint32_t *) attr_data;
 
         return 0;
 }
@@ -891,6 +918,8 @@ int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, str
         int r;
         void *attr_data;
 
+        assert_return(m, -EINVAL);
+
         r = message_attribute_has_type(m, type, NLA_ETHER_ADDR);
         if (r < 0)
                 return r;
@@ -901,7 +930,8 @@ int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, str
         else if ((size_t)r < sizeof(struct ether_addr))
                 return -EIO;
 
-        memcpy(data, attr_data, sizeof(struct ether_addr));
+        if (data)
+                memcpy(data, attr_data, sizeof(struct ether_addr));
 
         return 0;
 }
@@ -910,6 +940,8 @@ int sd_rtnl_message_read_cache_info(sd_rtnl_message *m, unsigned short type, str
         int r;
         void *attr_data;
 
+        assert_return(m, -EINVAL);
+
         r = message_attribute_has_type(m, type, NLA_CACHE_INFO);
         if (r < 0)
                 return r;
@@ -920,7 +952,8 @@ int sd_rtnl_message_read_cache_info(sd_rtnl_message *m, unsigned short type, str
         else if ((size_t)r < sizeof(struct ifa_cacheinfo))
                 return -EIO;
 
-        memcpy(info, attr_data, sizeof(struct ifa_cacheinfo));
+        if (info)
+                memcpy(info, attr_data, sizeof(struct ifa_cacheinfo));
 
         return 0;
 }
@@ -929,6 +962,8 @@ int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct
         int r;
         void *attr_data;
 
+        assert_return(m, -EINVAL);
+
         r = message_attribute_has_type(m, type, NLA_IN_ADDR);
         if (r < 0)
                 return r;
@@ -939,7 +974,8 @@ int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct
         else if ((size_t)r < sizeof(struct in_addr))
                 return -EIO;
 
-        memcpy(data, attr_data, sizeof(struct in_addr));
+        if (data)
+                memcpy(data, attr_data, sizeof(struct in_addr));
 
         return 0;
 }
@@ -948,6 +984,8 @@ int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struc
         int r;
         void *attr_data;
 
+        assert_return(m, -EINVAL);
+
         r = message_attribute_has_type(m, type, NLA_IN_ADDR);
         if (r < 0)
                 return r;
@@ -958,7 +996,8 @@ int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struc
         else if ((size_t)r < sizeof(struct in6_addr))
                 return -EIO;
 
-        memcpy(data, attr_data, sizeof(struct in6_addr));
+        if (data)
+                memcpy(data, attr_data, sizeof(struct in6_addr));
 
         return 0;
 }
@@ -1267,8 +1306,10 @@ int socket_read_message(sd_rtnl *rtnl) {
                 }
 
                 /* check that the size matches the message type */
-                if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size))
+                if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) {
+                        log_debug("sd-rtnl: message larger than expected, dropping");
                         continue;
+                }
 
                 r = message_new_empty(rtnl, &m);
                 if (r < 0)