statefiles: use tmpfile functions for pio files

Reduce code duplication by using the same tmpfile functions
for pio handling as well.

Signed-off-by: David Härdeman <david@hardeman.nu>
Link: https://github.com/openwrt/odhcpd/pull/333
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

diff --git a/src/statefiles.c b/src/statefiles.c
index 92ff1050811e208457026f395a58c3edb33601e2..325233667c63d60e2ee78c2239163003ce6f2140 100644 (file)
--- a/src/statefiles.c
+++ b/src/statefiles.c
@@ -78,9 +78,16 @@ static void statefiles_finish_tmp_file(int dirfd, FILE **fpp, const char *prefix
 {
        char *filename;
 
-       if (dirfd < 0 || !fpp || !*fpp || !prefix)
+       if (dirfd < 0 || !fpp || !*fpp)
                return;
 
+       if (!prefix) {
+               unlinkat(dirfd, ODHCPD_TMP_FILE, 0);
+               fclose(*fpp);
+               *fpp = NULL;
+               return;
+       }
+
        if (fflush(*fpp))
                error("Error flushing tmpfile: %m");
 
@@ -159,9 +166,11 @@ static bool statefiles_ra_pio_time(json_object *slaac_json, time_t *slaac_time)
 static json_object *statefiles_load_ra_pio_json(struct interface *iface)
 {
        json_object *json;
+       char filename[strlen(ODHCPD_PIO_FILE_PREFIX) + strlen(".") + strlen(iface->ifname) + 1];
        int fd;
 
-       fd = openat(config.ra_piofolder_fd, iface->ifname, O_RDONLY | O_CLOEXEC);
+       sprintf(filename, "%s.%s", ODHCPD_PIO_FILE_PREFIX, iface->ifname);
+       fd = openat(config.ra_piofolder_fd, filename, O_RDONLY | O_CLOEXEC);
        if (fd < 0)
                return NULL;
 
@@ -262,67 +271,21 @@ void statefiles_read_prefix_information(struct interface *iface)
 
 static void statefiles_save_ra_pio_json(struct interface *iface, struct json_object *json)
 {
-       size_t tmp_piofile_strlen;
-       char *tmp_piofile;
-       int fd, ret;
-
-       tmp_piofile_strlen = strlen(iface->ifname) + 2;
-       tmp_piofile = alloca(tmp_piofile_strlen);
-       snprintf(tmp_piofile, tmp_piofile_strlen, ".%s", iface->ifname);
-
-       fd = openat(config.ra_piofolder_fd,
-               tmp_piofile,
-               O_CREAT | O_TRUNC | O_WRONLY | O_CLOEXEC,
-               0644);
-       if (fd < 0) {
-               error("rfc9096: %s: error %m creating temporary json file",
-                     iface->ifname);
+       FILE *fp;
+
+       fp = statefiles_open_tmp_file(config.ra_piofolder_fd);
+       if (!fp)
                return;
-       }
 
-       ret = json_object_to_fd(fd, json, JSON_C_TO_STRING_PLAIN);
-       if (ret) {
+       if (json_object_to_fd(fileno(fp), json, JSON_C_TO_STRING_PLAIN)) {
                error("rfc9096: %s: json write error %s",
                      iface->ifname,
                      json_util_get_last_err());
-               close(fd);
-               unlinkat(config.ra_piofolder_fd, tmp_piofile, 0);
-               return;
-       }
-
-       ret = fsync(fd);
-       if (ret) {
-               error("rfc9096: %s: error %m syncing %s",
-                     iface->ifname,
-                     tmp_piofile);
-               close(fd);
-               unlinkat(config.ra_piofolder_fd, tmp_piofile, 0);
-               return;
-       }
-
-       ret = close(fd);
-       if (ret) {
-               error("rfc9096: %s: error %m closing %s",
-                     iface->ifname,
-                     tmp_piofile);
-               unlinkat(config.ra_piofolder_fd, tmp_piofile, 0);
-               return;
-       }
-
-       ret = renameat(config.ra_piofolder_fd,
-               tmp_piofile,
-               config.ra_piofolder_fd,
-               iface->ifname);
-       if (ret) {
-               error("rfc9096: %s: error %m renaming piofile: %s -> %s",
-                     iface->ifname,
-                     tmp_piofile,
-                     iface->ifname);
-               close(fd);
-               unlinkat(config.ra_piofolder_fd, tmp_piofile, 0);
+               statefiles_finish_tmp_file(config.ra_piofolder_fd, &fp, NULL, NULL);
                return;
        }
 
+       statefiles_finish_tmp_file(config.ra_piofolder_fd, &fp, ODHCPD_PIO_FILE_PREFIX, iface->ifname);
        iface->pio_update = false;
        warn("rfc9096: %s: piofile updated", iface->ifname);
 }

diff --git a/src/statefiles.h b/src/statefiles.h
index a29370d7e9c0bd2815763336a7eaa8322de779a4..8b22561f40c0afb0092fe036f73ed1f2e1375a74 100644 (file)
--- a/src/statefiles.h
+++ b/src/statefiles.h
@@ -9,6 +9,7 @@
 #define _STATEFILES_H_
 
 #define ODHCPD_HOSTS_FILE_PREFIX "odhcpd.hosts"
+#define ODHCPD_PIO_FILE_PREFIX "odhcpd.pio"
 #define ODHCPD_TMP_FILE ".odhcpd.tmp"
 
 void statefiles_read_prefix_information(struct interface *iface);