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rtspsrc: Move to new helper function to parse authentication responses

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=774416
This commit is contained in:
Sebastian Dröge 2016-11-18 17:00:59 +02:00
parent fc3022da1c
commit 058ab0df1d
1 changed files with 35 additions and 141 deletions
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176
gst/rtsp/gstrtspsrc.c
View file

@ -5149,131 +5149,6 @@ gst_rtsp_auth_method_to_string (GstRTSPAuthMethod method)
}
#endif
static const gchar *
gst_rtspsrc_skip_lws (const gchar * s)
{
while (g_ascii_isspace (*s))
s++;
return s;
}
static const gchar *
gst_rtspsrc_unskip_lws (const gchar * s, const gchar * start)
{
while (s > start && g_ascii_isspace (*(s - 1)))
s--;
return s;
}
static const gchar *
gst_rtspsrc_skip_commas (const gchar * s)
{
/* The grammar allows for multiple commas */
while (g_ascii_isspace (*s) || *s == ',')
s++;
return s;
}
static const gchar *
gst_rtspsrc_skip_item (const gchar * s)
{
gboolean quoted = FALSE;
const gchar *start = s;
/* A list item ends at the last non-whitespace character
* before a comma which is not inside a quoted-string. Or at
* the end of the string.
*/
while (*s) {
if (*s == '"')
quoted = !quoted;
else if (quoted) {
if (*s == '\\' && *(s + 1))
s++;
} else {
if (*s == ',')
break;
}
s++;
}
return gst_rtspsrc_unskip_lws (s, start);
}
static void
gst_rtsp_decode_quoted_string (gchar * quoted_string)
{
gchar *src, *dst;
src = quoted_string + 1;
dst = quoted_string;
while (*src && *src != '"') {
if (*src == '\\' && *(src + 1))
src++;
*dst++ = *src++;
}
*dst = '\0';
}
/* Extract the authentication tokens that the server provided for each method
* into an array of structures and give those to the connection object.
*/
static void
gst_rtspsrc_parse_digest_challenge (GstRTSPConnection * conn,
const gchar * header, gboolean * stale)
{
GSList *list = NULL, *iter;
const gchar *end;
gchar *item, *eq, *name_end, *value;
g_return_if_fail (stale != NULL);
gst_rtsp_connection_clear_auth_params (conn);
*stale = FALSE;
/* Parse a header whose content is described by RFC2616 as
* "#something", where "something" does not itself contain commas,
* except as part of quoted-strings, into a list of allocated strings.
*/
header = gst_rtspsrc_skip_commas (header);
while (*header) {
end = gst_rtspsrc_skip_item (header);
list = g_slist_prepend (list, g_strndup (header, end - header));
header = gst_rtspsrc_skip_commas (end);
}
if (!list)
return;
list = g_slist_reverse (list);
for (iter = list; iter; iter = iter->next) {
item = iter->data;
eq = strchr (item, '=');
if (eq) {
name_end = (gchar *) gst_rtspsrc_unskip_lws (eq, item);
if (name_end == item) {
/* That's no good... */
g_free (item);
continue;
}
*name_end = '\0';
value = (gchar *) gst_rtspsrc_skip_lws (eq + 1);
if (*value == '"')
gst_rtsp_decode_quoted_string (value);
} else
value = NULL;
if (value && strcmp (item, "stale") == 0 && strcmp (value, "TRUE") == 0)
*stale = TRUE;
gst_rtsp_connection_set_auth_param (conn, item, value);
g_free (item);
}
g_slist_free (list);
}
/* Parse a WWW-Authenticate Response header and determine the
* available authentication methods
*
@ -5283,24 +5158,47 @@ gst_rtspsrc_parse_digest_challenge (GstRTSPConnection * conn,
* At the moment, for Basic auth, we just do a minimal check and don't
* even parse out the realm */
static void
gst_rtspsrc_parse_auth_hdr (gchar * hdr, GstRTSPAuthMethod * methods,
GstRTSPConnection * conn, gboolean * stale)
gst_rtspsrc_parse_auth_hdr (GstRTSPMessage * response,
GstRTSPAuthMethod * methods, GstRTSPConnection * conn, gboolean * stale)
{
gchar *start;
GstRTSPAuthCredential **credentials, **credential;
g_return_if_fail (hdr != NULL);
g_return_if_fail (response != NULL);
g_return_if_fail (methods != NULL);
g_return_if_fail (stale != NULL);
/* Skip whitespace at the start of the string */
for (start = hdr; start[0] != '\0' && g_ascii_isspace (start[0]); start++);
credentials =
gst_rtsp_message_parse_auth_credentials (response,
GST_RTSP_HDR_WWW_AUTHENTICATE);
if (!credentials)
return;
if (g_ascii_strncasecmp (start, "basic", 5) == 0)
*methods |= GST_RTSP_AUTH_BASIC;
else if (g_ascii_strncasecmp (start, "digest ", 7) == 0) {
*methods |= GST_RTSP_AUTH_DIGEST;
gst_rtspsrc_parse_digest_challenge (conn, &start[7], stale);
credential = credentials;
while (*credential) {
if ((*credential)->scheme == GST_RTSP_AUTH_BASIC) {
*methods |= GST_RTSP_AUTH_BASIC;
} else if ((*credential)->scheme == GST_RTSP_AUTH_DIGEST) {
GstRTSPAuthParam **param = (*credential)->params;
*methods |= GST_RTSP_AUTH_DIGEST;
gst_rtsp_connection_clear_auth_params (conn);
*stale = FALSE;
while (*param) {
if (strcmp ((*param)->name, "stale") == 0
&& g_ascii_strcasecmp ((*param)->value, "TRUE") == 0)
*stale = TRUE;
gst_rtsp_connection_set_auth_param (conn, (*param)->name,
(*param)->value);
param++;
}
}
credential++;
}
gst_rtsp_auth_credentials_free (credentials);
}
/**
@ -5327,16 +5225,12 @@ gst_rtspsrc_setup_auth (GstRTSPSrc * src, GstRTSPMessage * response)
GstRTSPResult auth_result;
GstRTSPUrl *url;
GstRTSPConnection *conn;
gchar *hdr;
gboolean stale = FALSE;
conn = src->conninfo.connection;
/* Identify the available auth methods and see if any are supported */
if (gst_rtsp_message_get_header (response, GST_RTSP_HDR_WWW_AUTHENTICATE,
&hdr, 0) == GST_RTSP_OK) {
gst_rtspsrc_parse_auth_hdr (hdr, &avail_methods, conn, &stale);
}
gst_rtspsrc_parse_auth_hdr (response, &avail_methods, conn, &stale);
if (avail_methods == GST_RTSP_AUTH_NONE)
goto no_auth_available;