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Make gateway objects also detect routes with missing RTF_GATEWAY flag

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This was a bug, not a feature. From the FreeBSD manpage rtentry(9):

| Vt struct sockaddr *rt_gateway;
|
| The "target" of the route, which can either represent a destination in
| its own right (some protocols will put a link-layer address here), or
| some intermediate stop on the way to that destination (if the
| RTF_GATEWAY flag is set).

So for a default route with "dest" and "mask" both zero, either
RTF_GATEWAY is present, or "gate" is zero.
This commit is contained in:
Phil Sutter 2008-12-17 02:06:34 +01:00
parent d321573c2d
commit f85c1ea5a6
2 changed files with 16 additions and 15 deletions
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3
ChangeLog
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@ -1,3 +1,6 @@
2008-12-17
* Make gateway objects also detect routes with missing RTF_GATEWAY flag
2008-12-15
* Have a maximum width for all variable length mpd vars

28
src/linux.c
View File

@ -272,6 +272,10 @@ void update_gateway_info_failure(const char *reason)
info.gw_info.ip = strndup("failed", text_buffer_size);
}
/* Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT */
#define RT_ENTRY_FORMAT "%63s %lx %lx %x %*d %*d %*d %lx %*d %*d %*d\n"
void update_gateway_info(void)
{
FILE *fp;
@ -279,7 +283,6 @@ void update_gateway_info(void)
char iface[64];
unsigned long dest, gate, mask;
unsigned int flags;
short ref, use, metric, mtu, win, irtt;
struct gateway_info *gw_info = &info.gw_info;
@ -289,27 +292,22 @@ void update_gateway_info(void)
if ((fp = fopen("/proc/net/route", "r")) == NULL) {
update_gateway_info_failure("fopen()");
return;
}
if (fscanf(fp, "%*[^\n]\n") == EOF) {
//NULL because a empty table is not a error
update_gateway_info_failure(NULL);
fclose(fp);
return;
}
/* skip over the table header line, which is always present */
fscanf(fp, "%*[^\n]\n");
while (!feof(fp)) {
// Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT
if(fscanf(fp, "%63s %lx %lx %x %hd %hd %hd %lx %hd %hd %hd\n",
iface, &dest, &gate, &flags, &ref, &use,
&metric, &mask, &mtu, &win, &irtt) != 11) {
if(fscanf(fp, RT_ENTRY_FORMAT,
iface, &dest, &gate, &flags, &mask) != 5) {
update_gateway_info_failure("fscanf()");
fclose(fp);
return;
break;
}
if (flags & RTF_GATEWAY && dest == 0 && mask == 0) {
if (!(dest || mask) && ((flags & RTF_GATEWAY) || !gate) ) {
gw_info->count++;
SAVE_SET_STRING(gw_info->iface, iface)
ina.s_addr = gate;
ina.s_addr = gate;
SAVE_SET_STRING(gw_info->ip, inet_ntoa(ina))
}
}