Implement get_first_ethernet() for Linux systems properly

[ppp.git] / pppd / sys-linux.c

diff --git a/pppd/sys-linux.c b/pppd/sys-linux.c
index fc309ad267d02b6ac4e3f66b56ecdf1733bd610e..df5cebb55951cfa8960ee3f8f2686d9f9a8caa99 100644 (file)
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
@@ -625,7 +625,7 @@ void generic_disestablish_ppp(int dev_fd)
  * make_ppp_unit - make a new ppp unit for ppp_dev_fd.
  * Assumes new_style_driver.
  */
-static int make_ppp_unit()
+static int make_ppp_unit(void)
 {
        int x, flags;
 
@@ -1377,9 +1377,7 @@ int set_filters(struct bpf_program *pass, struct bpf_program *active)
  * get_idle_time - return how long the link has been idle.
  */
 int
-get_idle_time(u, ip)
-    int u;
-    struct ppp_idle *ip;
+get_idle_time(int u, struct ppp_idle *ip)
 {
     return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
 }
@@ -1389,9 +1387,7 @@ get_idle_time(u, ip)
  * get_ppp_stats - return statistics for the link.
  */
 int
-get_ppp_stats(u, stats)
-    int u;
-    struct pppd_stats *stats;
+get_ppp_stats(int u, struct pppd_stats *stats)
 {
     struct ifpppstatsreq req;
 
@@ -2105,10 +2101,43 @@ get_if_hwaddr(u_char *addr, char *name)
  * get_first_ethernet - return the name of the first ethernet-style
  * interface on this system.
  */
+static char first_ether_name[IF_NAMESIZE];
 char *
-get_first_ethernet()
+get_first_ethernet(void)
 {
-       return "eth0";
+       struct if_nameindex *if_ni, *i;
+       struct ifreq ifreq;
+       int ret, sock_fd;
+
+       sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+       if (sock_fd < 0)
+               return NULL;
+
+       if_ni = if_nameindex();
+       if (!if_ni) {
+               close(sock_fd);
+               return NULL;
+       }
+
+       first_ether_name[0] = 0;
+
+       for (i = if_ni; !(i->if_index == 0 && i->if_name == NULL); i++) {
+               memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
+               strlcpy(ifreq.ifr_name, i->if_name, sizeof(ifreq.ifr_name));
+               ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
+               if (ret >= 0 && ifreq.ifr_hwaddr.sa_family == ARPHRD_ETHER) {
+                       strlcpy(first_ether_name, i->if_name, sizeof(first_ether_name));
+                       break;
+               }
+       }
+
+       if_freenameindex(if_ni);
+       close(sock_fd);
+
+       if (!first_ether_name[0])
+               return NULL;
+
+       return first_ether_name;
 }
 
 /********************************************************************
@@ -2757,7 +2786,7 @@ int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
     memset(&ifr6, 0, sizeof(ifr6));
     IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
     ifr6.ifr6_ifindex = ifr.ifr_ifindex;
-    ifr6.ifr6_prefixlen = 10;
+    ifr6.ifr6_prefixlen = 128;
 
     if (ioctl(sock6_fd, SIOCSIFADDR, &ifr6) < 0) {
        error("sif6addr: ioctl(SIOCSIFADDR): %m (line %d)", __LINE__);
@@ -2768,7 +2797,7 @@ int sif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
     memset(&rt6, 0, sizeof(rt6));
     IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
     rt6.rtmsg_flags = RTF_UP;
-    rt6.rtmsg_dst_len = 10;
+    rt6.rtmsg_dst_len = 128;
     rt6.rtmsg_ifindex = ifr.ifr_ifindex;
     rt6.rtmsg_metric = 1;
 
@@ -2805,7 +2834,7 @@ int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
     memset(&ifr6, 0, sizeof(ifr6));
     IN6_LLADDR_FROM_EUI64(ifr6.ifr6_addr, our_eui64);
     ifr6.ifr6_ifindex = ifr.ifr_ifindex;
-    ifr6.ifr6_prefixlen = 10;
+    ifr6.ifr6_prefixlen = 128;
 
     if (ioctl(sock6_fd, SIOCDIFADDR, &ifr6) < 0) {
        if (errno != EADDRNOTAVAIL) {
@@ -2826,11 +2855,7 @@ int cif6addr (int unit, eui64_t our_eui64, eui64_t his_eui64)
  * to the uid given.  Assumes slave_name points to >= 16 bytes of space.
  */
 int
-get_pty(master_fdp, slave_fdp, slave_name, uid)
-    int *master_fdp;
-    int *slave_fdp;
-    char *slave_name;
-    int uid;
+get_pty(int *master_fdp, int *slave_fdp, char *slave_name, int uid)
 {
     int i, mfd, sfd = -1;
     char pty_name[16];
@@ -2956,10 +2981,7 @@ open_ppp_loopback(void)
  */
 
 int
-sifnpmode(u, proto, mode)
-    int u;
-    int proto;
-    enum NPmode mode;
+sifnpmode(int u, int proto, enum NPmode mode)
 {
     struct npioctl npi;
 
@@ -3070,7 +3092,7 @@ int cipxfaddr (int unit)
  * Use the hostname as part of the random number seed.
  */
 int
-get_host_seed()
+get_host_seed(void)
 {
     int h;
     char *p = hostname;