lib: Pass full path for RIB entries

The read functions for the RIB will now receive the full path, instead
of only the entry name. For IPCPs, we organized the RIB in an

/<ipcp>/<component>/entries

structure with a directory per component, so we don't need the full
path at this point. For process flow information, it's a lot more
convenient to organize it the following way

/<pid>/<fd>/stat

We can then register/unregister the flow descriptor when the frct
instance is created, and for getting the stats, we'd know the flow
descriptor from the fuse file path. If we would create a file per flow
instead of a directory per flow, something like

/<pid>/flows/<fd>

we'd need to do additional bookkeeping to list the contents of that
directory (we would need to track all flows with an active FRCT
instance), that fuse knows because it tracks the directories.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

5 files changed, 42 insertions, 18 deletions

diff --git a/include/ouroboros/rib.h b/include/ouroboros/rib.h
index 3a74bee3..9eab6334 100644
--- a/include/ouroboros/rib.h
+++ b/include/ouroboros/rib.h
@@ -23,7 +23,8 @@
 #ifndef OUROBOROS_LIB_RIB_H
 #define OUROBOROS_LIB_RIB_H
 
-#define RIB_PATH_LEN 128
+#define RIB_PATH_LEN  128
+#define RIB_SEPARATOR "/"
 
 #include <sys/types.h>
 
diff --git a/src/ipcpd/unicast/dt.c b/src/ipcpd/unicast/dt.c
index 9f15e2da..0f504daa 100644
--- a/src/ipcpd/unicast/dt.c
+++ b/src/ipcpd/unicast/dt.c
@@ -185,13 +185,17 @@ static int dt_rib_read(const char * path,
         int         i;
         char        str[QOS_BLOCK_LEN + 1];
         char        addrstr[20];
+        char *      entry;
         char        tmstr[20];
         size_t      rxqlen = 0;
         size_t      txqlen = 0;
         struct tm * tm;
 
         /* NOTE: we may need stronger checks. */
-        fd = atoi(path);
+        entry = strstr(path, RIB_SEPARATOR) + 1;
+        assert(entry);
+
+        fd = atoi(entry);
 
         if (len < RIB_FILE_STRLEN)
                 return 0;
@@ -333,9 +337,13 @@ static int dt_rib_getattr(const char *      path,
                           struct rib_attr * attr)
 {
 #ifdef IPCP_FLOW_STATS
-        int fd;
+        int    fd;
+        char * entry;
+
+        entry = strstr(path, RIB_SEPARATOR) + 1;
+        assert(entry);
 
-        fd = atoi(path);
+        fd = atoi(entry);
 
         pthread_mutex_lock(&dt.stat[fd].lock);
 
diff --git a/src/ipcpd/unicast/fa.c b/src/ipcpd/unicast/fa.c
index de9ca83d..2fa335e2 100644
--- a/src/ipcpd/unicast/fa.c
+++ b/src/ipcpd/unicast/fa.c
@@ -133,9 +133,13 @@ static int fa_rib_read(const char * path,
         char             r_eidstr[21];
         char             tmstr[20];
         char             castr[1024];
+        char *           entry;
         struct tm *      tm;
 
-        fd = atoi(path);
+        entry = strstr(path, RIB_SEPARATOR) + 1;
+        assert(entry);
+
+        fd = atoi(entry);
 
         if (fd < 0 || fd > PROG_MAX_FLOWS)
                 return -1;
@@ -253,9 +257,13 @@ static int fa_rib_getattr(const char *      path,
 {
 #ifdef IPCP_FLOW_STATS
         int              fd;
+        char *           entry;
         struct fa_flow * flow;
 
-        fd = atoi(path);
+        entry = strstr(path, RIB_SEPARATOR) + 1;
+        assert(entry);
+
+        fd = atoi(entry);
 
         flow = &fa.flows[fd];
 
diff --git a/src/ipcpd/unicast/pol/link_state.c b/src/ipcpd/unicast/pol/link_state.c
index 882bb8ac..08d39372 100644
--- a/src/ipcpd/unicast/pol/link_state.c
+++ b/src/ipcpd/unicast/pol/link_state.c
@@ -184,15 +184,19 @@ static int lsdb_rib_getattr(const char *      path,
 {
         struct adjacency * adj;
         struct timespec    now;
+        char *             entry;
 
         assert(path);
         assert(attr);
 
+        entry = strstr(path, RIB_SEPARATOR) + 1;
+        assert(entry);
+
         clock_gettime(CLOCK_REALTIME_COARSE, &now);
 
         pthread_rwlock_rdlock(&ls.db_lock);
 
-        adj = get_adj(path);
+        adj = get_adj(entry);
         if (adj != NULL) {
                 attr->mtime = adj->stamp;
                 attr->size  = LS_ENTRY_SIZE;
@@ -211,16 +215,20 @@ static int lsdb_rib_read(const char * path,
                          size_t       len)
 {
         struct adjacency * a;
+        char *             entry;
         int                size;
 
         assert(path);
 
+        entry = strstr(path, RIB_SEPARATOR) + 1;
+        assert(entry);
+
         pthread_rwlock_rdlock(&ls.db_lock);
 
         if (ls.db_len + ls.nbs_len == 0)
                 goto fail;
 
-        a = get_adj(path);
+        a = get_adj(entry);
         if (a == NULL)
                 goto fail;
 
diff --git a/src/lib/rib.c b/src/lib/rib.c
index b5222d6d..dfac69d7 100644
--- a/src/lib/rib.c
+++ b/src/lib/rib.c
@@ -52,8 +52,6 @@
 #define CLOCK_REALTIME_COARSE CLOCK_REALTIME
 #endif
 
-#define RT "/"
-
 struct reg_comp {
         struct list_head next;
 
@@ -108,8 +106,7 @@ static int rib_read(const char *            path,
 
         strcpy(comp, path + 1);
 
-        c = strstr(comp, "/");
-
+        c = strstr(comp, RIB_SEPARATOR);
         if (c != NULL)
                 *c = '\0';
 
@@ -121,7 +118,7 @@ static int rib_read(const char *            path,
         list_for_each(p, &rib.reg_comps) {
                 struct reg_comp * r = list_entry(p, struct reg_comp, next);
                 if (strcmp(comp, r->path) == 0) {
-                        int ret = r->ops->read(c + 1, buf, size);
+                        int ret = r->ops->read(path + 1, buf, size);
                         pthread_rwlock_unlock(&rib.lock);
                         return ret;
                 }
@@ -148,7 +145,7 @@ static int rib_readdir(const char *            path,
 
         pthread_rwlock_rdlock(&rib.lock);
 
-        if (strcmp(path, RT) == 0) {
+        if (strcmp(path, RIB_SEPARATOR) == 0) {
                 list_for_each(p, &rib.reg_comps) {
                         struct reg_comp * c;
                         c = list_entry(p, struct reg_comp, next);
@@ -194,8 +191,7 @@ static size_t __getattr(const char *  path,
 
         strcpy(comp, path + 1);
 
-        c = strstr(comp, "/");
-
+        c = strstr(comp, RIB_SEPARATOR);
         if (c != NULL)
                 *c = '\0';
 
@@ -206,7 +202,7 @@ static size_t __getattr(const char *  path,
         list_for_each(p, &rib.reg_comps) {
                 struct reg_comp * r = list_entry(p, struct reg_comp, next);
                 if (strcmp(comp, r->path) == 0) {
-                        size_t ret = r->ops->getattr(c + 1, &attr);
+                        size_t ret = r->ops->getattr(path + 1, &attr);
                         pthread_rwlock_unlock(&rib.lock);
                         st->st_mode  = S_IFREG | 0755;
                         st->st_nlink = 1;
@@ -231,7 +227,7 @@ static int rib_getattr(const char *  path,
 
         memset(st, 0, sizeof(*st));
 
-        if (strcmp(path, RT) == 0)
+        if (strcmp(path, RIB_SEPARATOR) == 0)
                 goto finish_dir;
 
         pthread_rwlock_rdlock(&rib.lock);
@@ -352,6 +348,9 @@ void rib_fini(void)
         struct list_head * p;
         struct list_head * h;
 
+        if (strlen(rib.mnt) == 0)
+                return;
+
         fuse_exit(rib.fuse);
 
         fuse_unmount(rib.mnt, rib.ch);