X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=helper.c;h=3615d77fa69cc9935dff4c486505895e8760e98f;hb=a35134d7c0765d863ae56e2c1879fb69b76df368;hp=5bd95fd24dbc8ed66d6826508cf02ed4f9f45a3d;hpb=3f781654282c8c85317394dfd874483c4321fac1;p=authbind.git

diff --git a/helper.c b/helper.c
index 5bd95fd..3615d77 100644
--- a/helper.c
+++ b/helper.c
@@ -48,7 +48,7 @@ static void perrorfail(const char *m) {
 }
 
 static void badusage(void) {
-  fprintf(stderr,"libauthbind's helper: bad usage\n %s\n",rcsid);
+  fprintf(stderr,"libauthbind's helper: bad usage\n (%s)\n",rcsid);
   exit(ENOSYS);
 }
 
@@ -72,6 +72,8 @@ int main(int argc, const char *const *argv) {
   if (argc != 3) badusage(); 
   addr= strtoul(argv[1],&ep,16); if (*ep || addr&~0x0ffffffffUL) badusage();
   port= strtoul(argv[2],&ep,16); if (*ep || port&~0x0ffffUL) badusage();
+  hport= htons(port);
+  if (hport >= IPPORT_RESERVED/2) _exit(EPERM);
 
   if (chdir(CONFIGDIR)) perrorfail("chdir " CONFIGDIR);
 
@@ -80,7 +82,6 @@ int main(int argc, const char *const *argv) {
   saddr.sin_family= AF_INET;
   saddr.sin_port= port;
   saddr.sin_addr.s_addr= addr;
-  hport= htons(port);
 
   snprintf(fnbuf,sizeof(fnbuf)-1,"byport/%u",hport);
   if (!access(fnbuf,X_OK)) authorised();