rp-pppoe plugin: Import some fixes from rp-pppoe-3.10

[ppp.git] / pppd / plugins / rp-pppoe / discovery.c

diff --git a/pppd/plugins/rp-pppoe/discovery.c b/pppd/plugins/rp-pppoe/discovery.c
index a856490f96fb7ba887ae2e8dda16a91eae358769..04877cb8295f767d90c989142da799a14c3fc4ec 100644 (file)
--- a/pppd/plugins/rp-pppoe/discovery.c
+++ b/pppd/plugins/rp-pppoe/discovery.c
@@ -40,6 +40,30 @@ static char const RCSID[] =
 
 #include <signal.h>
 
+/* Calculate time remaining until *exp, return 0 if now >= *exp */
+static int time_left(struct timeval *diff, struct timeval *exp)
+{
+    struct timeval now;
+
+    if (gettimeofday(&now, NULL) < 0) {
+       error("gettimeofday: %m");
+       return 0;
+    }
+
+    if (now.tv_sec > exp->tv_sec
+       || (now.tv_sec == exp->tv_sec && now.tv_usec >= exp->tv_usec))
+       return 0;
+
+    diff->tv_sec = exp->tv_sec - now.tv_sec;
+    diff->tv_usec = exp->tv_usec - now.tv_usec;
+    if (diff->tv_usec < 0) {
+       diff->tv_usec += 1000000;
+       --diff->tv_sec;
+    }
+
+    return 1;
+}
+
 /**********************************************************************
 *%FUNCTION: parseForHostUniq
 *%ARGUMENTS:
@@ -323,6 +347,8 @@ waitForPADO(PPPoEConnection *conn, int timeout)
     fd_set readable;
     int r;
     struct timeval tv;
+    struct timeval expire_at;
+
     PPPoEPacket packet;
     int len;
 
@@ -335,10 +361,16 @@ waitForPADO(PPPoEConnection *conn, int timeout)
     conn->seenMaxPayload = 0;
     conn->error = 0;
 
+    if (gettimeofday(&expire_at, NULL) < 0) {
+       error("gettimeofday (waitForPADO): %m");
+       return;
+    }
+    expire_at.tv_sec += timeout;
+
     do {
        if (BPF_BUFFER_IS_EMPTY) {
-           tv.tv_sec = timeout;
-           tv.tv_usec = 0;
+           if (!time_left(&tv, &expire_at))
+               return;         /* Timed out */
 
            FD_ZERO(&readable);
            FD_SET(conn->discoverySocket, &readable);
@@ -351,7 +383,8 @@ waitForPADO(PPPoEConnection *conn, int timeout)
                error("select (waitForPADO): %m");
                return;
            }
-           if (r == 0) return;        /* Timed out */
+           if (r == 0)
+               return;         /* Timed out */
        }
 
        /* Get the packet */
@@ -507,14 +540,22 @@ waitForPADS(PPPoEConnection *conn, int timeout)
     fd_set readable;
     int r;
     struct timeval tv;
+    struct timeval expire_at;
+
     PPPoEPacket packet;
     int len;
 
+    if (gettimeofday(&expire_at, NULL) < 0) {
+       error("gettimeofday (waitForPADS): %m");
+       return;
+    }
+    expire_at.tv_sec += timeout;
+
     conn->error = 0;
     do {
        if (BPF_BUFFER_IS_EMPTY) {
-           tv.tv_sec = timeout;
-           tv.tv_usec = 0;
+           if (!time_left(&tv, &expire_at))
+               return;         /* Timed out */
 
            FD_ZERO(&readable);
            FD_SET(conn->discoverySocket, &readable);
@@ -527,7 +568,8 @@ waitForPADS(PPPoEConnection *conn, int timeout)
                error("select (waitForPADS): %m");
                return;
            }
-           if (r == 0) return;
+           if (r == 0)
+               return;         /* Timed out */
        }
 
        /* Get the packet */
@@ -590,9 +632,6 @@ discovery(PPPoEConnection *conn)
     int padrAttempts = 0;
     int timeout = conn->discoveryTimeout;
 
-    conn->discoverySocket =
-       openInterface(conn->ifName, Eth_PPPOE_Discovery, conn->myEth);
-
     do {
        padiAttempts++;
        if (padiAttempts > MAX_PADI_ATTEMPTS) {