this will check after clearing a flag, that it is indeed cleared. it will

also be a bit more verbose and precise on errors. See Debian Bug #102474

diff --git a/ifconfig.c b/ifconfig.c
index 73a4e9b..37e39ee 100644 (file)
--- a/ifconfig.c
+++ b/ifconfig.c
@@ -3,7 +3,7 @@
  *              that either displays or sets the characteristics of
  *              one or more of the system's networking interfaces.
  *
- * Version:     $Id: ifconfig.c,v 1.50 2001/04/13 18:25:18 pb Exp $
+ * Version:     $Id: ifconfig.c,v 1.51 2001/06/29 03:48:51 ecki Exp $
  *
  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  *              and others.  Copyright 1993 MicroWalt Corporation
@@ -127,7 +127,7 @@ static int set_flag(char *ifname, short flag)
 
     safe_strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
     if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0) {
-       fprintf(stderr, _("%s: unknown interface: %s\n"), 
+       fprintf(stderr, _("%s: ERROR while getting interface flags: %s\n"), 
                ifname, strerror(errno));
        return (-1);
     }
@@ -159,7 +159,7 @@ static int clr_flag(char *ifname, short flag)
 
     safe_strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
     if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
-       fprintf(stderr, _("%s: unknown interface: %s\n"), 
+       fprintf(stderr, _("%s: ERROR while getting interface flags: %s\n"), 
                ifname, strerror(errno));
        return -1;
     }
@@ -172,6 +172,32 @@ static int clr_flag(char *ifname, short flag)
     return (0);
 }
 
+/** test is a specified flag is set */
+static int test_flag(char *ifname, short flags)
+{
+    struct ifreq ifr;
+    int fd;
+
+    if (strchr(ifname, ':')) {
+        /* This is a v4 alias interface.  Downing it via a socket for
+          another AF may have bad consequences. */
+        fd = get_socket_for_af(AF_INET);
+       if (fd < 0) {
+           fprintf(stderr, _("No support for INET on this system.\n"));
+           return -1;
+       }
+    } else
+        fd = skfd;
+
+    safe_strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+    if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
+       fprintf(stderr, _("%s: ERROR while testing interface flags: %s\n"), 
+               ifname, strerror(errno));
+       return -1;
+    }
+    return (ifr.ifr_flags & flags);
+}
+
 static void usage(void)
 {
     fprintf(stderr, _("Usage:\n  ifconfig [-a] [-i] [-v] [-s] <interface> [[<AF>] <address>]\n"));
@@ -388,6 +414,8 @@ int main(int argc, char **argv)
        }
        if (!strcmp(*spp, "-promisc")) {
            goterr |= clr_flag(ifr.ifr_name, IFF_PROMISC);
+           if (test_flag(ifr.ifr_name, IFF_PROMISC) > 0)
+               fprintf(stderr, _("Warning: Interface %s still in promisc mode... maybe other application is running?\n"), ifr.ifr_name);
            spp++;
            continue;
        }
@@ -398,6 +426,8 @@ int main(int argc, char **argv)
        }
        if (!strcmp(*spp, "-multicast")) {
            goterr |= clr_flag(ifr.ifr_name, IFF_MULTICAST);
+           if (test_flag(ifr.ifr_name, IFF_MULTICAST) > 0)
+               fprintf(stderr, _("Warning: Interface %s still in MULTICAST mode.\n"), ifr.ifr_name);
            spp++;
            continue;
        }
@@ -408,6 +438,8 @@ int main(int argc, char **argv)
        }
        if (!strcmp(*spp, "-allmulti")) {
            goterr |= clr_flag(ifr.ifr_name, IFF_ALLMULTI);
+           if (test_flag(ifr.ifr_name, IFF_MULTICAST) > 0)
+               fprintf(stderr, _("Warning: Interface %s still in ALLMULTI mode.\n"), ifr.ifr_name);
            spp++;
            continue;
        }
@@ -430,6 +462,8 @@ int main(int argc, char **argv)
        if (!strcmp(*spp, "-dynamic")) {
            goterr |= clr_flag(ifr.ifr_name, IFF_DYNAMIC);
            spp++;
+           if (test_flag(ifr.ifr_name, IFF_MULTICAST) > 0)
+               fprintf(stderr, _("Warning: Interface %s still in DYNAMIC mode.\n"), ifr.ifr_name);
            continue;
        }
 #endif
@@ -486,6 +520,8 @@ int main(int argc, char **argv)
 
        if (!strcmp(*spp, "-broadcast")) {
            goterr |= clr_flag(ifr.ifr_name, IFF_BROADCAST);
+           if (test_flag(ifr.ifr_name, IFF_MULTICAST) > 0)
+               fprintf(stderr, _("Warning: Interface %s still in BROADCAST mode.\n"), ifr.ifr_name);
            spp++;
            continue;
        }
@@ -541,7 +577,7 @@ int main(int argc, char **argv)
                continue;
            }
            didnetmask++;
-           goterr = set_netmask(ap->fd, &ifr, &sa);
+           goterr |= set_netmask(ap->fd, &ifr, &sa);
            spp++;
            continue;
        }
@@ -613,6 +649,8 @@ int main(int argc, char **argv)
        if (!strcmp(*spp, "-pointopoint")) {
            goterr |= clr_flag(ifr.ifr_name, IFF_POINTOPOINT);
            spp++;
+           if (test_flag(ifr.ifr_name, IFF_MULTICAST) > 0)
+               fprintf(stderr, _("Warning: Interface %s still in POINTOPOINT mode.\n"), ifr.ifr_name);
            continue;
        }
        if (!strcmp(*spp, "pointopoint")) {
@@ -911,7 +949,7 @@ int main(int argc, char **argv)
                if (didnetmask)
                    usage();
 
-               goterr = set_netmask(skfd, &ifr, &sa);
+               goterr |= set_netmask(skfd, &ifr, &sa);
                didnetmask++;
                break;
            }
@@ -980,6 +1018,9 @@ int main(int argc, char **argv)
        spp++;
     }
 
+    if (opt_v && goterr)
+       fprintf(stderr, _("WARNING: at least one error occured. (%d)\n"), goterr);
+
     return (goterr);
 }