X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=secnet.git;a=blobdiff_plain;f=tun.c;h=0baaf12226101cf83af5099cfac99e2fc6e464ae;hp=35d64186f7b4fee1503c89de5b5237c64878b9a6;hb=b7164ab60bf28a93fc02bb65b784134fcbbc41c5;hpb=4f5e39ecfaa49376b0a5c3a4c384e91a828c1105 diff --git a/tun.c b/tun.c index 35d6418..0baaf12 100644 --- a/tun.c +++ b/tun.c @@ -3,6 +3,7 @@ #include "netlink.h" #include #include +#include #include #include #include @@ -68,12 +69,12 @@ static struct flagstr config_types[]={ struct tun { struct netlink nl; int fd; - string_t device_path; - string_t ip_path; + cstring_t device_path; + cstring_t ip_path; string_t interface_name; - string_t ifconfig_path; + cstring_t ifconfig_path; uint32_t ifconfig_type; - string_t route_path; + cstring_t route_path; uint32_t route_type; uint32_t tun_flavour; bool_t search_for_if; /* Applies to tun-BSD only */ @@ -83,7 +84,7 @@ struct tun { uint32_t local_address; /* host interface address */ }; -static string_t tun_flavour_str(uint32_t flavour) +static cstring_t tun_flavour_str(uint32_t flavour) { switch (flavour) { case TUN_FLAVOUR_GUESS: return "guess"; @@ -95,18 +96,16 @@ static string_t tun_flavour_str(uint32_t flavour) } static int tun_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, - int *timeout_io, const struct timeval *tv_now, - uint64_t *now) + int *timeout_io) { struct tun *st=sst; *nfds_io=1; fds[0].fd=st->fd; - fds[0].events=POLLIN|POLLERR|POLLHUP; + fds[0].events=POLLIN; return 0; } -static void tun_afterpoll(void *sst, struct pollfd *fds, int nfds, - const struct timeval *tv_now, uint64_t *now) +static void tun_afterpoll(void *sst, struct pollfd *fds, int nfds) { struct tun *st=sst; int l; @@ -136,11 +135,27 @@ static void tun_afterpoll(void *sst, struct pollfd *fds, int nfds, static void tun_deliver_to_kernel(void *sst, struct buffer_if *buf) { struct tun *st=sst; + ssize_t rc; BUF_ASSERT_USED(buf); - /* No error checking, because we'd just throw the packet away - anyway if it didn't work. */ - write(st->fd,buf->start,buf->size); + + /* Log errors, so we can tell what's going on, but only once a + minute, so we don't flood the logs. Short writes count as + errors. */ + rc = write(st->fd,buf->start,buf->size); + if(rc != buf->size) { + static struct timeval last_report; + if(tv_now_global.tv_sec >= last_report.tv_sec + 60) { + if(rc < 0) + Message(M_WARNING, + "failed to deliver packet to tun device: %s\n", + strerror(errno)); + else + Message(M_WARNING, + "truncated packet delivered to tun device\n"); + last_report = tv_now_global; + } + } BUF_FREE(buf); } @@ -149,7 +164,7 @@ static bool_t tun_set_route(void *sst, struct netlink_client *routes) struct tun *st=sst; string_t network, mask, secnetaddr; struct subnet_list *nets; - uint32_t i; + int32_t i; int fd=-1; if (routes->up == routes->kup) return False; @@ -190,12 +205,13 @@ static bool_t tun_set_route(void *sst, struct netlink_client *routes) break; case TUN_CONFIG_IOCTL: { -#ifdef HAVE_NET_ROUTE_H + /* darwin rtentry has a different format, use /sbin/route instead */ +#if HAVE_NET_ROUTE_H && ! __APPLE__ struct rtentry rt; struct sockaddr_in *sa; int action; - memset(&rt,0,sizeof(rt)); + FILLZERO(rt); sa=(struct sockaddr_in *)&rt.rt_dst; sa->sin_family=AF_INET; sa->sin_addr.s_addr=htonl(nets->list[i].prefix); @@ -233,7 +249,7 @@ static void tun_phase_hook(void *sst, uint32_t newphase) { struct tun *st=sst; string_t hostaddr,secnetaddr; - uint8_t mtu[6]; + char mtu[6]; struct netlink_client *r; if (st->tun_flavour==TUN_FLAVOUR_BSD) { @@ -276,7 +292,7 @@ static void tun_phase_hook(void *sst, uint32_t newphase) fatal_perror("%s: can't open device file %s",st->nl.name, st->device_path); } - memset(&ifr,0,sizeof(ifr)); + FILLZERO(ifr); ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Just send/receive IP packets, no extra headers */ if (st->interface_name) @@ -333,10 +349,10 @@ static void tun_phase_hook(void *sst, uint32_t newphase) hostaddr=ipaddr_to_string(st->local_address); secnetaddr=ipaddr_to_string(st->nl.secnet_address); - snprintf(mtu,6,"%d",st->nl.mtu); + snprintf(mtu,sizeof(mtu),"%d",st->nl.mtu); mtu[5]=0; - switch (st->route_type) { + switch (st->ifconfig_type) { case TUN_CONFIG_LINUX: sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name, hostaddr,"netmask","255.255.255.255","-broadcast", @@ -353,7 +369,7 @@ static void tun_phase_hook(void *sst, uint32_t newphase) hostaddr,secnetaddr,"mtu",mtu,"up",(char *)0); break; case TUN_CONFIG_IOCTL: -#ifdef HAVE_NET_IF_H +#if HAVE_NET_IF_H && ! __APPLE__ { int fd; struct ifreq ifr; @@ -363,7 +379,7 @@ static void tun_phase_hook(void *sst, uint32_t newphase) /* Interface address */ strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); sa=(struct sockaddr_in *)&ifr.ifr_addr; - memset(sa,0,sizeof(*sa)); + FILLZERO(*sa); sa->sin_family=AF_INET; sa->sin_addr.s_addr=htonl(st->local_address); if (ioctl(fd,SIOCSIFADDR, &ifr)!=0) { @@ -373,7 +389,7 @@ static void tun_phase_hook(void *sst, uint32_t newphase) /* Netmask */ strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); sa=(struct sockaddr_in *)&ifr.ifr_netmask; - memset(sa,0,sizeof(*sa)); + FILLZERO(*sa); sa->sin_family=AF_INET; sa->sin_addr.s_addr=htonl(0xffffffff); if (ioctl(fd,SIOCSIFNETMASK, &ifr)!=0) { @@ -383,7 +399,7 @@ static void tun_phase_hook(void *sst, uint32_t newphase) /* Destination address (point-to-point) */ strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); sa=(struct sockaddr_in *)&ifr.ifr_dstaddr; - memset(sa,0,sizeof(*sa)); + FILLZERO(*sa); sa->sin_family=AF_INET; sa->sin_addr.s_addr=htonl(st->nl.secnet_address); if (ioctl(fd,SIOCSIFDSTADDR, &ifr)!=0) { @@ -480,13 +496,11 @@ static list_t *tun_create(closure_t *self, struct cloc loc, dict_t *context, fatal_perror("tun_create: uname"); } if (strcmp(u.sysname,"Linux")==0) { - if (u.release[0]=='2' && u.release[1]=='.' && u.release[3]=='.') { - if (u.release[2]=='2') st->tun_flavour=TUN_FLAVOUR_BSD; - else if (u.release[2]=='4') st->tun_flavour=TUN_FLAVOUR_LINUX; - } + st->tun_flavour=TUN_FLAVOUR_LINUX; } else if (strcmp(u.sysname,"SunOS")==0) { st->tun_flavour=TUN_FLAVOUR_STREAMS; - } else if (strcmp(u.sysname,"FreeBSD")==0) { + } else if (strcmp(u.sysname,"FreeBSD")==0 + || strcmp(u.sysname,"Darwin")==0) { st->tun_flavour=TUN_FLAVOUR_BSD; } } @@ -501,9 +515,13 @@ static list_t *tun_create(closure_t *self, struct cloc loc, dict_t *context, st->ifconfig_type=TUN_CONFIG_IOCTL; break; case TUN_FLAVOUR_BSD: +#if __linux__ /* XXX on Linux we still want TUN_CONFIG_IOCTL. Perhaps we can use this on BSD too. */ st->ifconfig_type=TUN_CONFIG_IOCTL; +#else + st->ifconfig_type=TUN_CONFIG_BSD; +#endif break; case TUN_FLAVOUR_STREAMS: st->ifconfig_type=TUN_CONFIG_BSD; @@ -597,7 +615,6 @@ static list_t *tun_bsd_apply(closure_t *self, struct cloc loc, dict_t *context, return tun_create(self,loc,context,args,TUN_FLAVOUR_BSD); } -init_module tun_module; void tun_module(dict_t *dict) { add_closure(dict,"tun",tun_apply);