[PATCH] osmo-mgw[master]: client: do not insist on \n\n when parsing MGCP messages

[dexter]

Review at  https://gerrit.osmocom.org/5867

client: do not insist on \n\n when parsing MGCP messages

The current implementation of mgcp_client.c requires MGCP
paragraphs to be separated wit a \n\n sequence. However,
when the client is used with servers other than osmo-mgcp,
the parapgraph may be formatted differently.

Also allow \n\r\n\r and \r\n\r\n as separator

Change-Id: Ie209fb71499e011e52f58575c6af118de2fdee88
---
M src/libosmo-mgcp-client/mgcp_client.c
1 file changed, 23 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-mgw refs/changes/67/5867/1

diff --git a/src/libosmo-mgcp-client/mgcp_client.c 
b/src/libosmo-mgcp-client/mgcp_client.c
index 9fc414d..f094a09 100644
--- a/src/libosmo-mgcp-client/mgcp_client.c
+++ b/src/libosmo-mgcp-client/mgcp_client.c
@@ -219,12 +219,33 @@
        return -EINVAL;
 }
 
+/* A new section is marked by a double line break, check a few more
+ * patterns as there may be variants */
+static char *mgcp_find_section_end(char *string)
+{
+       char *rc;
+
+       rc = strstr(string, "\n\n");
+       if (rc)
+               return rc;
+
+       rc = strstr(string, "\n\r\n\r");
+       if (rc)
+               return rc;
+
+       rc = strstr(string, "\r\n\r\n");
+       if (rc)
+               return rc;
+
+       return NULL;
+}
+
 int mgcp_response_parse_params(struct mgcp_response *r)
 {
        char *line;
        int rc;
        OSMO_ASSERT(r->body);
-       char *data = strstr(r->body, "\n\n");
+       char *data = mgcp_find_section_end(r->body);
 
        if (!data) {
                LOGP(DLMGCP, LOGL_ERROR,
@@ -286,7 +307,7 @@
        int rc = 0;
        OSMO_ASSERT(r->body);
        char *data = r->body;
-       char *data_end = strstr(r->body, "\n\n");
+       char *data_end = mgcp_find_section_end(r->body);
 
        /* Protect SDP body, for_each_non_empty_line() will
         * only parse until it hits \0 mark. */

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ie209fb71499e011e52f58575c6af118de2fdee88
Gerrit-PatchSet: 1
Gerrit-Project: osmo-mgw
Gerrit-Branch: master
Gerrit-Owner: dexter <pma...@sysmocom.de>