pppd.8: Document netmask option

[ppp.git] / pppd / plugins / pppoe / if.c

diff --git a/pppd/plugins/pppoe/if.c b/pppd/plugins/pppoe/if.c
index a3c384815ce2552055a152169293062af073b697..d5a4624fce5fe829d61d035847d373bfc94cc4f9 100644 (file)
--- a/pppd/plugins/pppoe/if.c
+++ b/pppd/plugins/pppoe/if.c
@@ -99,6 +99,7 @@ openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr)
     int fd;
     struct ifreq ifr;
     int domain, stype;
+    size_t maxlen;
 
 #ifdef HAVE_STRUCT_SOCKADDR_LL
     struct sockaddr_ll sa;
@@ -111,11 +112,18 @@ openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr)
 #ifdef HAVE_STRUCT_SOCKADDR_LL
     domain = PF_PACKET;
     stype = SOCK_RAW;
+    maxlen = IFNAMSIZ;
 #else
     domain = PF_INET;
     stype = SOCK_PACKET;
+    maxlen = sizeof(sa.sa_data);
 #endif
 
+    if (strlen(ifname) >= maxlen) {
+       error("Can't use interface %.16s: name is too long", ifname);
+       return -1;
+    }
+
     if ((fd = socket(domain, stype, htons(type))) < 0) {
        /* Give a more helpful message for the common error case */
        if (errno == EPERM) {
@@ -175,7 +183,7 @@ openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr)
     sa.sll_ifindex = ifr.ifr_ifindex;
 
 #else
-    strcpy(sa.sa_data, ifname);
+    strlcpy(sa.sa_data, ifname, sizeof(sa.sa_data));
 #endif
 
     /* We're only interested in packets on specified interface */
@@ -205,14 +213,14 @@ sendPacket(PPPoEConnection *conn, int sock, PPPoEPacket *pkt, int size)
 {
     int err;
 
-    if (debug)
+    if (debug_on())
        pppoe_log_packet("Send ", pkt);
 #if defined(HAVE_STRUCT_SOCKADDR_LL)
     err = send(sock, pkt, size, 0);
 #else
     struct sockaddr sa;
 
-    strcpy(sa.sa_data, conn->ifName);
+    strlcpy(sa.sa_data, conn->ifName, sizeof(sa.sa_data));
     err = sendto(sock, pkt, size, 0, &sa, sizeof(sa));
 #endif
     if (err < 0) {
@@ -240,7 +248,7 @@ receivePacket(int sock, PPPoEPacket *pkt, int *size)
        error("error receiving pppoe packet: %m");
        return -1;
     }
-    if (debug)
+    if (debug_on())
        pppoe_log_packet("Recv ", pkt);
     return 0;
 }