[Asterisk-code-review] chan sip: bigger buffers for headers, better failure mode (asterisk[13])
Corey Farrell
asteriskteam at digium.com
Thu Jun 16 14:47:10 CDT 2016
Corey Farrell has uploaded a new change for review.
https://gerrit.asterisk.org/3034
Change subject: chan_sip: bigger buffers for headers, better failure mode
......................................................................
chan_sip: bigger buffers for headers, better failure mode
Currently chan_sip can give weird messages if the contacts don't
fit in the From: or To: headers. This fix changes the from,to and
invite variables to use ast_str, allocates and deallocates them and
resizes them if needed.
ASTERISK-26069 #close
Change-Id: I1b68fcbddca6f6cc7d7a92fe1cb0d5430282b2b3
---
M channels/chan_sip.c
1 file changed, 46 insertions(+), 31 deletions(-)
git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/34/3034/1
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 77f4382..16a28fe 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -14154,9 +14154,10 @@
/*! \brief Initiate new SIP request to peer/user */
static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, const char * const explicit_uri)
{
- struct ast_str *invite = ast_str_alloca(256);
- char from[256];
- char to[256];
+#define SIPHEADER 256
+ struct ast_str *invite = ast_str_create(SIPHEADER);
+ struct ast_str *from = ast_str_create(SIPHEADER);
+ struct ast_str *to = ast_str_create(SIPHEADER);
char tmp_n[SIPBUFSIZE/2]; /* build a local copy of 'n' if needed */
char tmp_l[SIPBUFSIZE/2]; /* build a local copy of 'l' if needed */
const char *l = NULL; /* XXX what is this, exactly ? */
@@ -14258,34 +14259,40 @@
ourport = (p->fromdomainport && (p->fromdomainport != STANDARD_SIP_PORT)) ? p->fromdomainport : ast_sockaddr_port(&p->ourip);
if (!sip_standard_port(p->socket.type, ourport)) {
- ret = snprintf(from, sizeof(from), "<sip:%s@%s:%d>;tag=%s", tmp_l, d, ourport, p->tag);
+ ret = ast_str_set(&from, 0, "<sip:%s@%s:%d>;tag=%s", tmp_l, d, ourport, p->tag);
} else {
- ret = snprintf(from, sizeof(from), "<sip:%s@%s>;tag=%s", tmp_l, d, p->tag);
+ ret = ast_str_set(&from, 0, "<sip:%s@%s>;tag=%s", tmp_l, d, p->tag);
}
- if (ret < 0 || ret >= sizeof(from)) { /* a return value of size or more means that the output was truncated */
+ if (ret == AST_DYNSTR_BUILD_FAILED) {
/* We don't have an escape path from here... */
ast_log(LOG_ERROR, "The From header was truncated in call '%s'. This call setup will fail.\n", p->callid);
+ /* Make sure that the field contains something non-broken.
+ See https://issues.asterisk.org/jira/browse/ASTERISK-26069
+ */
+ ast_str_set(&from, 3, "<>");
+
}
/* If a caller id name was specified, prefix a display name, if there is enough room. */
if (cid_has_name || !cid_has_num) {
- size_t written = strlen(from);
- ssize_t left = sizeof(from) - written - 4; /* '"" \0' */
- if (left > 0) {
- size_t name_len;
- if (sip_cfg.pedanticsipchecking) {
- ast_escape_quoted(n, tmp_n, MIN(left + 1, sizeof(tmp_n)));
- n = tmp_n;
- }
- name_len = strlen(n);
- if (left < name_len) {
- name_len = left;
- }
- memmove(from + name_len + 3, from, written + 1);
- from[0] = '"';
- memcpy(from + 1, n, name_len);
- from[name_len + 1] = '"';
- from[name_len + 2] = ' ';
+ size_t written = ast_str_strlen(from);
+ size_t name_len;
+ if (sip_cfg.pedanticsipchecking) {
+ ast_escape_quoted(n, tmp_n, sizeof(tmp_n));
+ n = tmp_n;
+ }
+ name_len = strlen(n);
+ ret = ast_str_make_space(&from, name_len + written + 4);
+
+ if (ret == 0) {
+ /* needed again, as ast_str_make_space coud've changed the pointer */
+ char *from_buf = ast_str_buffer(from);
+
+ memmove(from_buf + name_len + 3, from_buf, written + 1);
+ from_buf[0] = '"';
+ memcpy(from_buf + 1, n, name_len);
+ from_buf[name_len + 1] = '"';
+ from_buf[name_len + 2] = ' ';
}
}
@@ -14328,24 +14335,28 @@
/*! \todo Need to add back the VXML URL here at some point, possibly use build_string for all this junk */
if (!strchr(p->todnid, '@')) {
/* We have no domain in the dnid */
- ret = snprintf(to, sizeof(to), "<sip:%s@%s>%s%s", p->todnid, p->tohost, ast_strlen_zero(p->theirtag) ? "" : ";tag=", p->theirtag);
+ ret = ast_str_set(&to, 0, "<sip:%s@%s>%s%s", p->todnid, p->tohost, ast_strlen_zero(p->theirtag) ? "" : ";tag=", p->theirtag);
} else {
- ret = snprintf(to, sizeof(to), "<sip:%s>%s%s", p->todnid, ast_strlen_zero(p->theirtag) ? "" : ";tag=", p->theirtag);
+ ret = ast_str_set(&to, 0, "<sip:%s>%s%s", p->todnid, ast_strlen_zero(p->theirtag) ? "" : ";tag=", p->theirtag);
}
} else {
if (sipmethod == SIP_NOTIFY && !ast_strlen_zero(p->theirtag)) {
/* If this is a NOTIFY, use the From: tag in the subscribe (RFC 3265) */
- ret = snprintf(to, sizeof(to), "<%s%s>;tag=%s", (strncasecmp(p->uri, "sip:", 4) ? "sip:" : ""), p->uri, p->theirtag);
+ ret = ast_str_set(&to, 0, "<%s%s>;tag=%s", (strncasecmp(p->uri, "sip:", 4) ? "sip:" : ""), p->uri, p->theirtag);
} else if (p->options && p->options->vxml_url) {
/* If there is a VXML URL append it to the SIP URL */
- ret = snprintf(to, sizeof(to), "<%s>;%s", p->uri, p->options->vxml_url);
+ ret = ast_str_set(&to, 0, "<%s>;%s", p->uri, p->options->vxml_url);
} else {
- ret = snprintf(to, sizeof(to), "<%s>", p->uri);
+ ret = ast_str_set(&to, 0, "<%s>", p->uri);
}
}
- if (ret < 0 || ret >= sizeof(to)) { /* a return value of size or more means that the output was truncated */
+ if (ret == AST_DYNSTR_BUILD_FAILED) {
/* We don't have an escape path from here... */
ast_log(LOG_ERROR, "The To header was truncated in call '%s'. This call setup will fail.\n", p->callid);
+ /* Make sure that the field contains something non-broken.
+ See https://issues.asterisk.org/jira/browse/ASTERISK-26069
+ */
+ ast_str_set(&to, 3, "<>");
}
init_req(req, sipmethod, p->uri);
@@ -14360,8 +14371,8 @@
*/
add_route(req, &p->route, 0);
- add_header(req, "From", from);
- add_header(req, "To", to);
+ add_header(req, "From", ast_str_buffer(from));
+ add_header(req, "To", ast_str_buffer(to));
ast_string_field_set(p, exten, l);
build_contact(p, req, 0);
add_header(req, "Contact", p->our_contact);
@@ -14370,6 +14381,10 @@
if (!ast_strlen_zero(global_useragent)) {
add_header(req, "User-Agent", global_useragent);
}
+
+ ast_free(from);
+ ast_free(to);
+ ast_free(invite);
}
/*! \brief Add "Diversion" header to outgoing message
--
To view, visit https://gerrit.asterisk.org/3034
To unsubscribe, visit https://gerrit.asterisk.org/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: I1b68fcbddca6f6cc7d7a92fe1cb0d5430282b2b3
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Corey Farrell <git at cfware.com>
Gerrit-Reviewer: Vasil Kolev <vasil.kolev at securax.org>
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