add an extra check

[project/uci.git] / file.c

diff --git a/file.c b/file.c
index 6f43715..4650a96 100644 (file)
--- a/file.c
+++ b/file.c
@@ -19,6 +19,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <stdbool.h>
+#include <fcntl.h>
 #include <stdio.h>
 #include <ctype.h>
 
@@ -274,6 +275,7 @@ static void assert_eol(struct uci_context *ctx, char **str)
 static void uci_switch_config(struct uci_context *ctx)
 {
        struct uci_parse_context *pctx;
+       struct uci_element *e;
        const char *name;
 
        pctx = ctx->pctx;
@@ -295,7 +297,9 @@ static void uci_switch_config(struct uci_context *ctx)
         * ignore errors here, e.g. if the config was not found
         */
        UCI_TRAP_SAVE(ctx, ignore);
-       uci_unload(ctx, name);
+       e = uci_lookup_list(ctx, &ctx->root, name);
+       if (e)
+               uci_unload(ctx, uci_to_package(e));
        UCI_TRAP_RESTORE(ctx);
 ignore:
        ctx->errno = 0;
@@ -529,23 +533,28 @@ int uci_load(struct uci_context *ctx, const char *name, struct uci_package **pac
 {
        struct stat statbuf;
        char *filename;
-       bool confpath;
+       bool confdir;
        FILE *file;
+       int fd;
 
        UCI_HANDLE_ERR(ctx);
        UCI_ASSERT(ctx, name != NULL);
 
        switch (name[0]) {
        case '.':
+               if (name[1] != '/')
+                       UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+               /* fall through */
        case '/':
                /* absolute/relative path outside of /etc/config */
-               filename = (char *) name;
-               confpath = false;
+               filename = uci_strdup(ctx, name);
+               name = strrchr(name, '/') + 1;
+               confdir = false;
                break;
        default:
                filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
                sprintf(filename, UCI_CONFDIR "/%s", name);
-               confpath = true;
+               confdir = true;
                break;
        }
 
@@ -554,16 +563,49 @@ int uci_load(struct uci_context *ctx, const char *name, struct uci_package **pac
                UCI_THROW(ctx, UCI_ERR_NOTFOUND);
        }
 
-       file = fopen(filename, "r");
-       if (filename != name)
-               free(filename);
+       fd = open(filename, O_RDONLY);
+       if (fd <= 0)
+               UCI_THROW(ctx, UCI_ERR_IO);
 
+       if (flock(fd, LOCK_SH) < 0)
+               UCI_THROW(ctx, UCI_ERR_IO);
+
+       file = fdopen(fd, "r");
        if (!file)
                UCI_THROW(ctx, UCI_ERR_IO);
 
-       return uci_import(ctx, file, name, package);
+       ctx->errno = 0;
+       UCI_TRAP_SAVE(ctx, done);
+       uci_import(ctx, file, name, package);
+       UCI_TRAP_RESTORE(ctx);
+
+       if (*package) {
+               (*package)->path = filename;
+               (*package)->confdir = confdir;
+       }
+
+done:
+       flock(fd, LOCK_UN);
+       fclose(file);
+       return ctx->errno;
 }
 
+/* 
+ * This function returns the filename by returning the string
+ * after the last '/' character. By checking for a non-'\0'
+ * character afterwards, directories are ignored (glob marks
+ * those with a trailing '/'
+ */
+static inline char *get_filename(char *path)
+{
+       char *p;
+
+       p = strrchr(path, '/');
+       p++;
+       if (!*p)
+               return NULL;
+       return p;
+}
 
 char **uci_list_configs(struct uci_context *ctx)
 {