From 648051f07cffd0d91c89dc6706e3d0d6a286de43 Mon Sep 17 00:00:00 2001 From: Steven Liu Date: Wed, 29 Apr 2020 12:50:57 +0800 Subject: avformat/url: check url root node when rel include double dot and trim double dot fix ticket: 8625 and add testcase into url for double dot corner case Signed-off-by: Steven Liu --- libavformat/tests/url.c | 5 ++++ libavformat/url.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 78 insertions(+), 4 deletions(-) (limited to 'libavformat') diff --git a/libavformat/tests/url.c b/libavformat/tests/url.c index 5e484fd428..1d961a1b43 100644 --- a/libavformat/tests/url.c +++ b/libavformat/tests/url.c @@ -56,6 +56,7 @@ int main(void) test("/foo/bar", "baz"); test("/foo/bar", "../baz"); test("/foo/bar", "/baz"); + test("/foo/bar", "../../../baz"); test("http://server/foo/", "baz"); test("http://server/foo/bar", "baz"); test("http://server/foo/", "../baz"); @@ -65,6 +66,10 @@ int main(void) test("http://server/foo/bar?param=value/with/slashes", "/baz"); test("http://server/foo/bar?param&otherparam", "?someparam"); test("http://server/foo/bar", "//other/url"); + test("http://server/foo/bar", "../../../../../other/url"); + test("http://server/foo/bar", "/../../../../../other/url"); + test("http://server/foo/bar", "/test/../../../../../other/url"); + test("http://server/foo/bar", "/test/../../test/../../../other/url"); printf("\nTesting av_url_split:\n"); test2("/foo/bar"); diff --git a/libavformat/url.c b/libavformat/url.c index 596fb49cfc..7cd9e0c705 100644 --- a/libavformat/url.c +++ b/libavformat/url.c @@ -21,6 +21,7 @@ #include "avformat.h" +#include "internal.h" #include "config.h" #include "url.h" #if CONFIG_NETWORK @@ -77,10 +78,53 @@ int ff_url_join(char *str, int size, const char *proto, return strlen(str); } +static void trim_double_dot_url(char *buf, const char *rel, int size) +{ + const char *p = rel; + const char *root = rel; + char tmp_path[MAX_URL_SIZE] = {0, }; + char *sep; + char *node; + + /* Get the path root of the url which start by "://" */ + if (p && (sep = strstr(p, "://"))) { + sep += 3; + root = strchr(sep, '/'); + } + + /* set new current position if the root node is changed */ + p = root; + while (p && (node = strstr(p, ".."))) { + av_strlcat(tmp_path, p, node - p + strlen(tmp_path)); + p = node + 3; + sep = strrchr(tmp_path, '/'); + if (sep) + sep[0] = '\0'; + else + tmp_path[0] = '\0'; + } + + if (!av_stristart(p, "/", NULL) && root != rel) + av_strlcat(tmp_path, "/", size); + + av_strlcat(tmp_path, p, size); + /* start set buf after temp path process. */ + av_strlcpy(buf, rel, root - rel + 1); + + if (!av_stristart(tmp_path, "/", NULL) && root != rel) + av_strlcat(buf, "/", size); + + av_strlcat(buf, tmp_path, size); +} + void ff_make_absolute_url(char *buf, int size, const char *base, const char *rel) { char *sep, *path_query; + char *root, *p; + char tmp_path[MAX_URL_SIZE]; + + memset(tmp_path, 0, sizeof(tmp_path)); /* Absolute path, relative to the current server */ if (base && strstr(base, "://") && rel[0] == '/') { if (base != buf) @@ -99,11 +143,14 @@ void ff_make_absolute_url(char *buf, int size, const char *base, } } av_strlcat(buf, rel, size); + trim_double_dot_url(tmp_path, buf, size); + memset(buf, 0, size); + av_strlcpy(buf, tmp_path, size); return; } /* If rel actually is an absolute url, just copy it */ if (!base || strstr(rel, "://") || rel[0] == '/') { - av_strlcpy(buf, rel, size); + trim_double_dot_url(buf, rel, size); return; } if (base != buf) @@ -117,19 +164,38 @@ void ff_make_absolute_url(char *buf, int size, const char *base, /* Is relative path just a new query part? */ if (rel[0] == '?') { av_strlcat(buf, rel, size); + trim_double_dot_url(tmp_path, buf, size); + memset(buf, 0, size); + av_strlcpy(buf, tmp_path, size); return; } + root = p = buf; + /* Get the path root of the url which start by "://" */ + if (p && strstr(p, "://")) { + sep = strstr(p, "://"); + if (sep) { + sep += 3; + root = strchr(sep, '/'); + } + } + /* Remove the file name from the base url */ sep = strrchr(buf, '/'); + if (sep <= root) + sep = root; + if (sep) sep[1] = '\0'; else buf[0] = '\0'; - while (av_strstart(rel, "../", NULL) && sep) { + while (av_strstart(rel, "..", NULL) && sep) { /* Remove the path delimiter at the end */ - sep[0] = '\0'; - sep = strrchr(buf, '/'); + if (sep > root) { + sep[0] = '\0'; + sep = strrchr(buf, '/'); + } + /* If the next directory name to pop off is "..", break here */ if (!strcmp(sep ? &sep[1] : buf, "..")) { /* Readd the slash we just removed */ @@ -144,6 +210,9 @@ void ff_make_absolute_url(char *buf, int size, const char *base, rel += 3; } av_strlcat(buf, rel, size); + trim_double_dot_url(tmp_path, buf, size); + memset(buf, 0, size); + av_strlcpy(buf, tmp_path, size); } AVIODirEntry *ff_alloc_dir_entry(void) -- cgit v1.2.3