diff options
Diffstat (limited to 'platform-linux.c')
| -rw-r--r-- | platform-linux.c | 51 |
1 files changed, 50 insertions, 1 deletions
diff --git a/platform-linux.c b/platform-linux.c index 79562c8..119ec50 100644 --- a/platform-linux.c +++ b/platform-linux.c @@ -1,6 +1,6 @@ /* * dhcpcd - DHCP client daemon - * Copyright (c) 2006-2010 Roy Marples <roy@marples.name> + * Copyright (c) 2006-2012 Roy Marples <roy@marples.name> * All rights reserved * Redistribution and use in source and binary forms, with or without @@ -27,7 +27,9 @@ #include <errno.h> #include <stdio.h> +#include <stdlib.h> #include <string.h> +#include <syslog.h> #include "common.h" #include "platform.h" @@ -102,3 +104,50 @@ hardware_platform(void) errno = ESRCH; return p; } + +static int +check_proc_int(const char *path) +{ + FILE *fp; + char *buf; + + fp = fopen(path, "r"); + if (fp == NULL) + return -1; + buf = get_line(fp); + fclose(fp); + if (buf == NULL) + return -1; + return atoi(buf); +} + +static const char *prefix = "/proc/sys/net/ipv6/conf"; + +int +check_ipv6(const char *ifname) +{ + int r; + char path[256]; + + if (ifname == NULL) + ifname = "all"; + + snprintf(path, sizeof(path), "%s/%s/accept_ra", prefix, ifname); + r = check_proc_int(path); + if (r != 1 && r != 2) { + syslog(LOG_WARNING, + "%s: not configured to accept IPv6 RAs", ifname); + return 0; + } + + if (r != 2) { + snprintf(path, sizeof(path), "%s/%s/forwarding", + prefix, ifname); + if (check_proc_int(path) != 0) { + syslog(LOG_WARNING, + "%s: configured as a router, not a host", ifname); + return 0; + } + } + return 1; +} |