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authorDenys Vlasenko2021-09-09 22:00:44 +0200
committerDenys Vlasenko2021-09-09 22:00:44 +0200
commit7ab9cd23988b48956fcfe171d5828d61285baf40 (patch)
tree10b3d522ff45b06ac9dd9f362ddc336c5b058ee0 /libbb/xconnect.c
parent82c5eb8e4681ba345500e5c368fb54741bb0c450 (diff)
downloadbusybox-7ab9cd23988b48956fcfe171d5828d61285baf40.zip
busybox-7ab9cd23988b48956fcfe171d5828d61285baf40.tar.gz
libbb: make bb_lookup_port() abort on bad port names
Also, no need to preserve errno function old new delta .rodata 104247 104241 -6 bb_lookup_port 97 83 -14 nc_main 1039 1018 -21 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-41) Total: -41 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/xconnect.c')
-rw-r--r--libbb/xconnect.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/libbb/xconnect.c b/libbb/xconnect.c
index 5dd9cfd..f1983a6 100644
--- a/libbb/xconnect.c
+++ b/libbb/xconnect.c
@@ -115,27 +115,19 @@ void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
/* Return port number for a service.
* If "port" is a number use it as the port.
- * If "port" is a name it is looked up in /etc/services,
- * if it isnt found return default_port
+ * If "port" is a name it is looked up in /etc/services.
+ * if NULL, return default_port
*/
-unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
+unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned port_nr)
{
- unsigned port_nr = default_port;
if (port) {
- int old_errno;
-
- /* Since this is a lib function, we're not allowed to reset errno to 0.
- * Doing so could break an app that is deferring checking of errno. */
- old_errno = errno;
port_nr = bb_strtou(port, NULL, 10);
if (errno || port_nr > 65535) {
struct servent *tserv = getservbyname(port, protocol);
- port_nr = default_port;
- if (tserv)
- port_nr = ntohs(tserv->s_port);
-//FIXME: else: port string was garbage, but we don't report that???
+ if (!tserv)
+ bb_error_msg_and_die("bad port '%s'", port);
+ port_nr = ntohs(tserv->s_port);
}
- errno = old_errno;
}
return (uint16_t)port_nr;
}