[sr-dev] git:master:3d2359b5: rls: replace sprintf with safer snprintf

Module: kamailio Branch: master Commit: 3d2359b5a349efe4d6571ec0953e5c4aae54a165 URL: https://github.com/kamailio/kamailio/commit/3d2359b5a349efe4d6571ec0953e5c4… Author: Daniel-Constantin Mierla &lt;miconda(a)gmail.com&gt; Committer: Daniel-Constantin Mierla &lt;miconda(a)gmail.com&gt; Date: 2017-08-12T08:59:06+02:00 rls: replace sprintf with safer snprintf - compact printing headers in 200ok function by doing it once in a snprintf, instead of combination of many sprintf and strncpy --- Modified: src/modules/rls/subscribe.c --- Diff: https://github.com/kamailio/kamailio/commit/3d2359b5a349efe4d6571ec0953e5c4… Patch: https://github.com/kamailio/kamailio/commit/3d2359b5a349efe4d6571ec0953e5c4… --- diff --git a/src/modules/rls/subscribe.c b/src/modules/rls/subscribe.c index b08e55e6f2..dc76e4fdba 100644 --- a/src/modules/rls/subscribe.c +++ b/src/modules/rls/subscribe.c @@ -339,35 +339,24 @@ int reply_200(struct sip_msg* msg, str* contact, int expires) str hdr_append; int len; - hdr_append.s = (char *)pkg_malloc( sizeof(char)*(contact->len+ 70)); + hdr_append.s = (char *)pkg_malloc( sizeof(char)*(contact->len+70)); if(hdr_append.s == NULL) { LM_ERR("no more pkg memory\n"); return -1; } - hdr_append.len = sprintf(hdr_append.s, "Expires: %d\r\n", expires); - if(hdr_append.len< 0) + hdr_append.len = snprintf(hdr_append.s, contact->len+70, + "Expires: %d" CRLF + "Contact: <%.*s>" CRLF + "Require: eventlist" CRLF, + expires, + contact->len, contact->s + ); + if(hdr_append.len<0 || hdr_append.len>=contact->len+70) { - LM_ERR("unsuccessful sprintf\n"); + LM_ERR("unsuccessful snprintf\n"); goto error; } - strncpy(hdr_append.s+hdr_append.len ,"Contact: <", 10); - hdr_append.len += 10; - strncpy(hdr_append.s+hdr_append.len, contact->s, contact->len); - hdr_append.len+= contact->len; - strncpy(hdr_append.s+hdr_append.len, ">", 1); - hdr_append.len += 1; - strncpy(hdr_append.s+hdr_append.len, CRLF, CRLF_LEN); - hdr_append.len += CRLF_LEN; - - len = sprintf(hdr_append.s+ hdr_append.len, "Require: eventlist\r\n"); - if(len < 0) - { - LM_ERR("unsuccessful sprintf\n"); - goto error; - } - hdr_append.len+= len; - hdr_append.s[hdr_append.len]= '\0'; if (add_lump_rpl( msg, hdr_append.s, hdr_append.len, LUMP_RPL_HDR)==0 ) {