remove almost all useless instances of add_blank_header() but one,

for which i need to investigate a bit more (but i am almost 100%
sure that one is also useless).
I do the commit in two steps so it is easier to track the problem.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@26915 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 2b51265d8cea91c7aa2571be1a271806f59bd486..ece87955890369c174507e884d303a6bda8a6b6c 100644 (file)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -1796,11 +1796,22 @@ static void parse_copy(struct sip_request *dst, struct sip_request *src)
        parse_request(dst);
 }
 
+/* add a blank line if no body */
+static void add_blank(struct sip_request *req)
+{
+       if (!req->lines) {
+               /* Add extra empty return. add_header() reserves 4 bytes so cannot be truncated */
+               snprintf(req->data + req->len, sizeof(req->data) - req->len, "\r\n");
+               req->len += strlen(req->data + req->len);
+       }
+}
+
 /*! \brief Transmit response on SIP request*/
 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno)
 {
        int res;
 
+       add_blank(req);
        if (sip_debug_test_pvt(p)) {
                char iabuf[INET_ADDRSTRLEN];
                if (ast_test_flag(&p->flags[0], SIP_NAT_ROUTE))
@@ -1827,6 +1838,7 @@ static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittyp
 {
        int res;
 
+       add_blank(req);
        if (sip_debug_test_pvt(p)) {
                char iabuf[INET_ADDRSTRLEN];
                if (ast_test_flag(&p->flags[0], SIP_NAT_ROUTE))
@@ -4578,7 +4590,6 @@ static int __transmit_response(struct sip_pvt *p, const char *msg, struct sip_re
                snprintf(buf, sizeof(buf), "%d", p->owner->hangupcause);
                add_header(&resp, "X-Asterisk-HangupCauseCode", buf);
        }
-       add_blank_header(&resp);
        return send_response(p, &resp, reliable, seqno);
 }
 
@@ -4625,7 +4636,6 @@ static int transmit_response_with_date(struct sip_pvt *p, char *msg, struct sip_
        respprep(&resp, p, msg, req);
        append_date(&resp);
        add_header_contentLength(&resp, 0);
-       add_blank_header(&resp);
        return send_response(p, &resp, XMIT_UNRELIABLE, 0);
 }
 
@@ -4636,7 +4646,6 @@ static int transmit_response_with_allow(struct sip_pvt *p, char *msg, struct sip
        respprep(&resp, p, msg, req);
        add_header(&resp, "Accept", "application/sdp");
        add_header_contentLength(&resp, 0);
-       add_blank_header(&resp);
        return send_response(p, &resp, reliable, 0);
 }
 
@@ -4657,7 +4666,6 @@ static int transmit_response_with_auth(struct sip_pvt *p, const char *msg, struc
        respprep(&resp, p, msg, req);
        add_header(&resp, header, tmp);
        add_header_contentLength(&resp, 0);
-       add_blank_header(&resp);
        return send_response(p, &resp, reliable, seqno);
 }
 
@@ -5395,7 +5403,6 @@ static int transmit_invite(struct sip_pvt *p, int sipmethod, int sdp, int init)
                add_sdp(&req, p);
        } else {
                add_header_contentLength(&req, 0);
-               add_blank_header(&req);
        }
 
        if (!p->initreq.headers)
@@ -5915,7 +5922,6 @@ static int transmit_register(struct sip_registry *r, int sipmethod, char *auth,
        add_header(&req, "Contact", p->our_contact);
        add_header(&req, "Event", "registration");
        add_header_contentLength(&req, 0);
-       add_blank_header(&req);
 
        initialize_initreq(p, &req);
        if (sip_debug_test_pvt(p))
@@ -6000,7 +6006,6 @@ static int transmit_refer(struct sip_pvt *p, const char *dest)
        add_header(&req, "Supported", SUPPORTED_EXTENSIONS);
        if (!ast_strlen_zero(p->our_contact))
                add_header(&req, "Referred-By", p->our_contact);
-       add_blank_header(&req);
 
        return send_request(p, &req, 1, p->ocseq);
        /* We should propably wait for a NOTIFY here until we ack the transfer */
@@ -6038,7 +6043,6 @@ static int transmit_request(struct sip_pvt *p, int sipmethod, int seqno, enum xm
        struct sip_request resp;
        reqprep(&resp, p, sipmethod, seqno, newbranch);
        add_header_contentLength(&resp, 0);
-       add_blank_header(&resp);
        return send_request(p, &resp, reliable, seqno ? seqno : p->ocseq);
 }
 
@@ -6073,7 +6077,6 @@ static int transmit_request_with_auth(struct sip_pvt *p, int sipmethod, int seqn
        }
 
        add_header_contentLength(&resp, 0);
-       add_blank_header(&resp);
        return send_request(p, &resp, reliable, seqno ? seqno : p->ocseq);      
 }