Port: Explicitly allocate realpath() resolved buffer

[lttng-tools.git] / src / common / utils.c

diff --git a/src/common/utils.c b/src/common/utils.c
index 3c9e70ddad6439ee362d9187c751151eca60d32a..2417a7d255ffb1445e12ec9e24ba2b5a29900e1d 100644 (file)
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -17,14 +17,12 @@
  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#define _GNU_SOURCE
 #define _LGPL_SOURCE
 #include <assert.h>
 #include <ctype.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <stdlib.h>
-#include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ -32,11 +30,13 @@
 #include <grp.h>
 #include <pwd.h>
 #include <sys/file.h>
-#include <dirent.h>
 
 #include <common/common.h>
 #include <common/runas.h>
 #include <common/compat/getenv.h>
+#include <common/compat/string.h>
+#include <common/compat/dirent.h>
+#include <lttng/constant.h>
 
 #include "utils.h"
 #include "defaults.h"
@@ -82,6 +82,8 @@ char *utils_partial_realpath(const char *path, char *resolved_path, size_t size)
 
        /* Resolve the canonical path of the first part of the path */
        while (try_path != NULL && next != end) {
+               char *try_path_buf = NULL;
+
                /*
                 * If there is not any '/' left, we want to try with
                 * the full path
@@ -92,15 +94,22 @@ char *utils_partial_realpath(const char *path, char *resolved_path, size_t size)
                }
 
                /* Cut the part we will be trying to resolve */
-               cut_path = strndup(path, next - path);
+               cut_path = lttng_strndup(path, next - path);
                if (cut_path == NULL) {
-                       PERROR("strndup");
+                       PERROR("lttng_strndup");
+                       goto error;
+               }
+
+               try_path_buf = zmalloc(LTTNG_PATH_MAX);
+               if (!try_path_buf) {
+                       PERROR("zmalloc");
                        goto error;
                }
 
                /* Try to resolve this part */
-               try_path = realpath((char *)cut_path, NULL);
+               try_path = realpath((char *)cut_path, try_path_buf);
                if (try_path == NULL) {
+                       free(try_path_buf);
                        /*
                         * There was an error, we just want to be assured it
                         * is linked to an unexistent directory, if it's another
@@ -117,6 +126,7 @@ char *utils_partial_realpath(const char *path, char *resolved_path, size_t size)
                        }
                } else {
                        /* Save the place we are before trying the next step */
+                       try_path_buf = NULL;
                        free(try_path_prev);
                        try_path_prev = try_path;
                        prev = next;
@@ -230,9 +240,9 @@ char *utils_expand_path(const char *path)
        while ((next = strstr(absolute_path, "/./"))) {
 
                /* We prepare the start_path not containing it */
-               start_path = strndup(absolute_path, next - absolute_path);
+               start_path = lttng_strndup(absolute_path, next - absolute_path);
                if (!start_path) {
-                       PERROR("strndup");
+                       PERROR("lttng_strndup");
                        goto error;
                }
                /* And we concatenate it with the part after this string */
@@ -250,9 +260,9 @@ char *utils_expand_path(const char *path)
                }
 
                /* Then we prepare the start_path not containing it */
-               start_path = strndup(absolute_path, previous - absolute_path);
+               start_path = lttng_strndup(absolute_path, previous - absolute_path);
                if (!start_path) {
-                       PERROR("strndup");
+                       PERROR("lttng_strndup");
                        goto error;
                }
 
@@ -480,7 +490,7 @@ int utils_create_pid_file(pid_t pid, const char *filepath)
                goto error;
        }
 
-       ret = fprintf(fp, "%d\n", pid);
+       ret = fprintf(fp, "%d\n", (int) pid);
        if (ret < 0) {
                PERROR("fprintf pid file");
                goto error;
@@ -489,7 +499,7 @@ int utils_create_pid_file(pid_t pid, const char *filepath)
        if (fclose(fp)) {
                PERROR("fclose");
        }
-       DBG("Pid %d written in file %s", pid, filepath);
+       DBG("Pid %d written in file %s", (int) pid, filepath);
        ret = 0;
 error:
        return ret;
@@ -504,11 +514,13 @@ int utils_create_lock_file(const char *filepath)
 {
        int ret;
        int fd;
+       struct flock lock;
 
        assert(filepath);
 
-       fd = open(filepath, O_CREAT,
-               O_WRONLY | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+       memset(&lock, 0, sizeof(lock));
+       fd = open(filepath, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR |
+               S_IRGRP | S_IWGRP);
        if (fd < 0) {
                PERROR("open lock file %s", filepath);
                ret = -1;
@@ -520,8 +532,12 @@ int utils_create_lock_file(const char *filepath)
         * already a process using the same lock file running
         * and we should exit.
         */
-       ret = flock(fd, LOCK_EX | LOCK_NB);
-       if (ret) {
+       lock.l_whence = SEEK_SET;
+       lock.l_type = F_WRLCK;
+
+       ret = fcntl(fd, F_SETLK, &lock);
+       if (ret == -1) {
+               PERROR("fcntl lock file");
                ERR("Could not get lock file %s, another instance is running.",
                        filepath);
                if (close(fd)) {
@@ -1197,6 +1213,7 @@ LTTNG_HIDDEN
 int utils_recursive_rmdir(const char *path)
 {
        DIR *dir;
+       size_t path_len;
        int dir_fd, ret = 0, closeret, is_empty = 1;
        struct dirent *entry;
 
@@ -1206,19 +1223,40 @@ int utils_recursive_rmdir(const char *path)
                PERROR("Cannot open '%s' path", path);
                return -1;
        }
-       dir_fd = dirfd(dir);
+       dir_fd = lttng_dirfd(dir);
        if (dir_fd < 0) {
-               PERROR("dirfd");
+               PERROR("lttng_dirfd");
                return -1;
        }
 
+       path_len = strlen(path);
        while ((entry = readdir(dir))) {
                if (!strcmp(entry->d_name, ".")
                                || !strcmp(entry->d_name, ".."))
                        continue;
-               switch (entry->d_type) {
-               case DT_DIR:
-               {
+
+               struct stat st;
+               size_t name_len;
+               char filename[PATH_MAX];
+
+               name_len = strlen(entry->d_name);
+               if (path_len + name_len + 2 > sizeof(filename)) {
+                       ERR("Failed to remove file: path name too long (%s/%s)",
+                               path, entry->d_name);
+                       continue;
+               }
+               if (snprintf(filename, sizeof(filename), "%s/%s",
+                               path, entry->d_name) < 0) {
+                       ERR("Failed to format path.");
+                       continue;
+               }
+
+               if (stat(filename, &st)) {
+                       PERROR("stat");
+                       continue;
+               }
+
+               if (S_ISDIR(st.st_mode)) {
                        char subpath[PATH_MAX];
 
                        strncpy(subpath, path, PATH_MAX);
@@ -1230,12 +1268,9 @@ int utils_recursive_rmdir(const char *path)
                        if (utils_recursive_rmdir(subpath)) {
                                is_empty = 0;
                        }
-                       break;
-               }
-               case DT_REG:
+               } else if (S_ISREG(st.st_mode)) {
                        is_empty = 0;
-                       break;
-               default:
+               } else {
                        ret = -EINVAL;
                        goto end;
                }