ipcpd: Add capability reporting

The IPCP will now report the DIF name and the hash value to the IRMd
as a dif_info struct. This can later be extended to add further
capability reporting. Some bugfixes in normal.

Fixes #24

3 files changed, 61 insertions, 36 deletions

diff --git a/src/irmd/ipcp.c b/src/irmd/ipcp.c
index 7a32dd88..182970b1 100644
--- a/src/irmd/ipcp.c
+++ b/src/irmd/ipcp.c
@@ -212,13 +212,13 @@ int ipcp_bootstrap(pid_t              api,
         return ret;
 }
 
-/* return the hash algorithm */
-int ipcp_enroll(pid_t        api,
-                const char * dst)
+int ipcp_enroll(pid_t             api,
+                const char *      dst,
+                struct dif_info * info)
 {
-        ipcp_msg_t msg = IPCP_MSG__INIT;
+        ipcp_msg_t   msg      = IPCP_MSG__INIT;
         ipcp_msg_t * recv_msg = NULL;
-        int ret = -1;
+        int          ret      = -1;
 
         if (dst == NULL)
                 return -EINVAL;
@@ -236,9 +236,23 @@ int ipcp_enroll(pid_t        api,
         }
 
         ret = recv_msg->result;
+        if (ret != 0) {
+                ipcp_msg__free_unpacked(recv_msg, NULL);
+                return ret;
+        }
+
+        if (!recv_msg->has_dir_hash_algo || recv_msg->dif_name == NULL) {
+                ipcp_msg__free_unpacked(recv_msg, NULL);
+                return -EIPCP;
+        }
+
+        info->algo = recv_msg->dir_hash_algo;
+
+        strcpy(info->dif_name, recv_msg->dif_name);
+
         ipcp_msg__free_unpacked(recv_msg, NULL);
 
-        return ret;
+        return 0;
 }
 
 int ipcp_reg(pid_t           api,
diff --git a/src/irmd/ipcp.h b/src/irmd/ipcp.h
index 11adad7d..74175f97 100644
--- a/src/irmd/ipcp.h
+++ b/src/irmd/ipcp.h
@@ -34,10 +34,11 @@ pid_t ipcp_create(const char *   name,
 
 int   ipcp_destroy(pid_t api);
 
-int   ipcp_enroll(pid_t        api,
-                  const char * dst);
+int   ipcp_enroll(pid_t             api,
+                  const char *      dst,
+                  struct dif_info * info);
 
-int   ipcp_bootstrap(pid_t              api,
+int   ipcp_bootstrap(pid_t               api,
                      ipcp_config_msg_t * conf);
 
 int   ipcp_reg(pid_t           api,
diff --git a/src/irmd/main.c b/src/irmd/main.c
index 45a348ae..67c2ad60 100644
--- a/src/irmd/main.c
+++ b/src/irmd/main.c
@@ -56,7 +56,7 @@
 
 #define IRMD_CLEANUP_TIMER ((IRMD_FLOW_TIMEOUT / 20) * MILLION) /* ns */
 #define SHM_SAN_HOLDOFF 1000 /* ms */
-#define IPCP_HASH_LEN(e) (hash_len(e->dir_hash_algo))
+#define IPCP_HASH_LEN(e) hash_len(e->dir_hash_algo)
 
 struct ipcp_entry {
         struct list_head next;
@@ -226,27 +226,26 @@ static struct ipcp_entry * get_ipcp_entry_by_name(const char * name)
         return NULL;
 }
 
-/*
- * Check if the hash is reachable anywhere in a DIF.
- * FIXME: specify algorithm used
- */
 static struct ipcp_entry * get_ipcp_by_dst_name(const char * name)
 {
         struct list_head * p = NULL;
         uint8_t * hash;
 
         list_for_each(p, &irmd.ipcps) {
-                struct ipcp_entry * e =
-                        list_entry(p, struct ipcp_entry, next);
-                if (e->dir_hash_algo < 0)
+                struct ipcp_entry * e = list_entry(p, struct ipcp_entry, next);
+                if (e->dif_name == NULL)
                         continue;
+
+                log_dbg("IPCP %s found for name %s with hash enum %d.",
+                        e->dif_name, name, e->dir_hash_algo);
+
                 hash = malloc(IPCP_HASH_LEN(e));
                 if  (hash == NULL)
                         return NULL;
 
                 str_hash(e->dir_hash_algo, hash, name);
 
-                if (ipcp_query(e->api, hash, hash_len(e->dir_hash_algo)) == 0) {
+                if (ipcp_query(e->api, hash, IPCP_HASH_LEN(e)) == 0) {
                         free(hash);
                         return e;
                 }
@@ -319,10 +318,10 @@ static pid_t create_ipcp(char *         name,
 
         list_add(&api->next, &irmd.spawned_apis);
 
-        pthread_mutex_lock(&tmp->init_lock);
-
         pthread_rwlock_unlock(&irmd.reg_lock);
 
+        pthread_mutex_lock(&tmp->init_lock);
+
         while (tmp->init == false)
                 pthread_cond_wait(&tmp->init_cond, &tmp->init_lock);
 
@@ -401,7 +400,7 @@ static int destroy_ipcp(pid_t api)
         return 0;
 }
 
-static int bootstrap_ipcp(pid_t              api,
+static int bootstrap_ipcp(pid_t               api,
                           ipcp_config_msg_t * conf)
 {
         struct ipcp_entry * entry = NULL;
@@ -445,9 +444,10 @@ static int bootstrap_ipcp(pid_t              api,
 }
 
 static int enroll_ipcp(pid_t  api,
-                       char * dif_name)
+                       char * dst_name)
 {
         struct ipcp_entry * entry = NULL;
+        struct dif_info info;
 
         pthread_rwlock_wrlock(&irmd.reg_lock);
 
@@ -464,27 +464,35 @@ static int enroll_ipcp(pid_t  api,
                 return -1;
         }
 
-        entry->dif_name = strdup(dif_name);
-        if (entry->dif_name == NULL) {
-                pthread_rwlock_unlock(&irmd.reg_lock);
-                log_err("Failed to strdup.");
+        pthread_rwlock_unlock(&irmd.reg_lock);
+
+        if (ipcp_enroll(api, dst_name, &info) < 0) {
+                log_err("Could not enroll IPCP.");
                 return -1;
         }
 
-        pthread_rwlock_unlock(&irmd.reg_lock);
+        pthread_rwlock_wrlock(&irmd.reg_lock);
 
-        entry->dir_hash_algo = ipcp_enroll(api, dif_name);
-        if (entry->dir_hash_algo < 0) {
-                pthread_rwlock_wrlock(&irmd.reg_lock);
-                free(entry->dif_name);
-                entry->dif_name = NULL;
+        entry = get_ipcp_entry_by_api(api);
+        if (entry == NULL) {
                 pthread_rwlock_unlock(&irmd.reg_lock);
-                log_err("Could not enroll IPCP.");
+                log_err("No such IPCP.");
                 return -1;
         }
 
+        entry->dif_name = strdup(info.dif_name);
+        if (entry->dif_name == NULL) {
+                pthread_rwlock_unlock(&irmd.reg_lock);
+                log_err("Failed to strdup dif_name.");
+                return -ENOMEM;
+        }
+
+        entry->dir_hash_algo = info.algo;
+
+        pthread_rwlock_unlock(&irmd.reg_lock);
+
         log_info("Enrolled IPCP %d in DIF %s.",
-                 api, dif_name);
+                 api, info.dif_name);
 
         return 0;
 }
@@ -769,6 +777,9 @@ static int name_reg(const char *  name,
                         if (wildcard_match(difs[i], e->dif_name))
                                 continue;
 
+                        log_dbg("gonna register %s in dif %s.",
+                                name, e->dif_name);
+
                         hash = malloc(IPCP_HASH_LEN(e));
                         if  (hash == NULL)
                                 break;
@@ -1101,10 +1112,9 @@ static int flow_alloc(pid_t              api,
         assert(irm_flow_get_state(f) == FLOW_ALLOC_PENDING);
 
         hash = malloc(IPCP_HASH_LEN(ipcp));
-        if  (hash == NULL) {
+        if  (hash == NULL)
                 /* sanitizer cleans this */
                 return -ENOMEM;
-        }
 
         str_hash(ipcp->dir_hash_algo, hash, dst);