patch pppd to be able to deal with time changes during a connection, fixes #31

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2432 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/ppp/patches/209-compensate_time_change.patch b/package/ppp/patches/209-compensate_time_change.patch
new file mode 100644 (file)
index 0000000..f43085a
--- /dev/null
+++ b/package/ppp/patches/209-compensate_time_change.patch
@@ -0,0 +1,82 @@
+diff -urN ppp.old/pppd/main.c ppp.dev/pppd/main.c
+--- ppp.old/pppd/main.c        2005-11-11 19:19:28.177790000 +0100
++++ ppp.dev/pppd/main.c        2005-11-11 20:18:05.957363000 +0100
+@@ -90,6 +90,7 @@
+ #include <sys/socket.h>
+ #include <netinet/in.h>
+ #include <arpa/inet.h>
++#include <sys/sysinfo.h>
+ 
+ #include "pppd.h"
+ #include "magic.h"
+@@ -227,6 +228,7 @@
+ 
+ /* Prototypes for procedures local to this file. */
+ 
++static void check_time(void);
+ static void setup_signals __P((void));
+ static void create_pidfile __P((int pid));
+ static void create_linkpidfile __P((int pid));
+@@ -531,6 +533,7 @@
+           info("Starting link");
+       }
+ 
++      check_time();
+       gettimeofday(&start_time, NULL);
+       script_unsetenv("CONNECT_TIME");
+       script_unsetenv("BYTES_SENT");
+@@ -1195,6 +1198,36 @@
+ 
+ static struct callout *callout = NULL;        /* Callout list */
+ static struct timeval timenow;                /* Current time */
++static long uptime_diff = 0;
++static int uptime_diff_set = 0;
++
++static void check_time(void)
++{
++      long new_diff;
++      struct timeval t;
++      struct sysinfo i;
++    struct callout *p;
++      
++      gettimeofday(&t, NULL);
++      sysinfo(&i);
++      new_diff = t.tv_sec - i.uptime;
++      
++      if (!uptime_diff_set) {
++              uptime_diff = new_diff;
++              uptime_diff_set = 1;
++              return;
++      }
++
++      if ((new_diff - 5 > uptime_diff) || (new_diff + 5 < uptime_diff)) {
++              /* system time has changed, update counters and timeouts */
++              info("System time change detected.");
++              start_time.tv_sec += new_diff - uptime_diff;
++              
++      for (p = callout; p != NULL; p = p->c_next)
++                      p->c_time.tv_sec += new_diff - uptime_diff;
++      }
++      uptime_diff = new_diff;
++}
+ 
+ /*
+  * timeout - Schedule a timeout.
+@@ -1265,6 +1298,8 @@
+ {
+     struct callout *p;
+ 
++      check_time();
++      
+     while (callout != NULL) {
+       p = callout;
+ 
+@@ -1292,6 +1327,8 @@
+ {
+     if (callout == NULL)
+       return NULL;
++      
++      check_time();
+ 
+     gettimeofday(&timenow, NULL);
+     tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;