diff options
author | jpeeler <jpeeler@f38db490-d61c-443f-a65b-d21fe96a405b> | 2009-11-04 23:53:43 +0000 |
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committer | jpeeler <jpeeler@f38db490-d61c-443f-a65b-d21fe96a405b> | 2009-11-04 23:53:43 +0000 |
commit | 06716eb12832c761b6ac0056ad14fec193efa3e6 (patch) | |
tree | 76e434d74b07d6f18bc9544acd409397c507e759 /res | |
parent | 5af7410f487ba65b392f0fef9b99f59c944c2b5c (diff) |
Merged revisions 227945 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk
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r227945 | jpeeler | 2009-11-04 17:50:59 -0600 (Wed, 04 Nov 2009) | 21 lines
Merged revisions 227944 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4
........
r227944 | jpeeler | 2009-11-04 17:47:08 -0600 (Wed, 04 Nov 2009) | 14 lines
Fix incorrect filename comparsion after monitor file change
The logic to detect if a requested file is indeed a different file from the
current file was incorrect. The main issue being confusion of the use of
filename_base which was previously set without pathing information and then
compared to another full path. Robust file comparison logic has been added
to properly check if two files are the same even if symlinks are used.
(closes issue #15313)
Reported by: caspy
Patches:
20091103__issue15313__1.4.diff.txt uploaded by jpeeler (license 325)
but mostly tilghman's work
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git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.2@227947 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'res')
-rw-r--r-- | res/res_monitor.c | 41 |
1 files changed, 37 insertions, 4 deletions
diff --git a/res/res_monitor.c b/res/res_monitor.c index 17d84892f..13b5fe01d 100644 --- a/res/res_monitor.c +++ b/res/res_monitor.c @@ -177,7 +177,8 @@ int ast_monitor_start( struct ast_channel *chan, const char *format_spec, directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base); snprintf(monitor->write_filename, FILENAME_MAX, "%s%s%s-out", directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base); - ast_copy_string(monitor->filename_base, fname_base, sizeof(monitor->filename_base)); + snprintf(monitor->filename_base, FILENAME_MAX, "%s/%s", + ast_config_AST_MONITOR_DIR, fname_base); } else { ast_mutex_lock(&monitorlock); snprintf(monitor->read_filename, FILENAME_MAX, "%s/audio-in-%ld", @@ -422,12 +423,44 @@ int ast_monitor_change_fname(struct ast_channel *chan, const char *fname_base, i int directory = strchr(fname_base, '/') ? 1 : 0; const char *absolute = *fname_base == '/' ? "" : "/"; char tmpstring[sizeof(chan->monitor->filename_base)] = ""; + int i, fd[2] = { -1, -1 }, doexit = 0; /* before continuing, see if we're trying to rename the file to itself... */ snprintf(tmpstring, sizeof(tmpstring), "%s%s%s", directory ? "" : ast_config_AST_MONITOR_DIR, absolute, fname_base); - if (!strcmp(tmpstring, chan->monitor->filename_base)) { - if (option_debug > 2) - ast_log(LOG_DEBUG, "No need to rename monitor filename to itself\n"); + + /*!\note We cannot just compare filenames, due to symlinks, relative + * paths, and other possible filesystem issues. We could use + * realpath(3), but its use is discouraged. However, if we try to + * create the same file from two different paths, the second will + * fail, and so we have our notification that the filenames point to + * the same path. + * + * Remember, also, that we're using the basename of the file (i.e. + * the file without the format suffix), so it does not already exist + * and we aren't interfering with the recording itself. + */ + ast_debug(2, "comparing tmpstring %s to filename_base %s\n", tmpstring, chan->monitor->filename_base); + + if ((fd[0] = open(tmpstring, O_CREAT | O_WRONLY, 0644)) < 0 || + (fd[1] = open(chan->monitor->filename_base, O_CREAT | O_EXCL | O_WRONLY, 0644)) < 0) { + if (fd[0] < 0) { + ast_log(LOG_ERROR, "Unable to compare filenames: %s\n", strerror(errno)); + } else { + ast_debug(2, "No need to rename monitor filename to itself\n"); + } + doexit = 1; + } + + /* Cleanup temporary files */ + for (i = 0; i < 2; i++) { + if (fd[i] >= 0) { + while (close(fd[i]) < 0 && errno == EINTR); + } + } + unlink(tmpstring); + unlink(chan->monitor->filename_base); + + if (doexit) { UNLOCK_IF_NEEDED(chan, need_lock); return 0; } |