int
rtmsg(int cmd)
{
static int seq;
struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
char *cp = m_rtmsg.m_space;
int l;
errno = 0;
if (cmd == RTM_DELETE)
goto doit;
memset((char *)&m_rtmsg, 0, sizeof(m_rtmsg));
rtm->rtm_flags = flags;
rtm->rtm_version = RTM_VERSION;
switch (cmd) {
default:
syslog(LOG_ERR, "arptab_set: internal wrong cmd");
exit(1);
case RTM_ADD:
rtm->rtm_addrs |= RTA_GATEWAY;
rtm->rtm_rmx.rmx_expire = expire_time;
rtm->rtm_inits = RTV_EXPIRE;
rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
sin_m.sin_other = 0;
if (doing_proxy) {
if (export_only)
sin_m.sin_other = SIN_PROXY;
else {
rtm->rtm_addrs |= RTA_NETMASK;
rtm->rtm_flags &= ~RTF_HOST;
}
}
/* FALLTHROUGH */
case RTM_GET:
rtm->rtm_addrs |= RTA_DST;
}
#define NEXTADDR(w, s) \
if (rtm->rtm_addrs & (w)) { \
memcpy(cp, (char *)&s, sizeof(s)); \
cp += sizeof(s); \
}
NEXTADDR(RTA_DST, sin_m);
NEXTADDR(RTA_GATEWAY, sdl_m);
NEXTADDR(RTA_NETMASK, so_mask);
rtm->rtm_msglen = cp - (char *)&m_rtmsg;
doit:
l = rtm->rtm_msglen;
rtm->rtm_seq = ++seq;
rtm->rtm_type = cmd;
if (write(s, (char *)&m_rtmsg, l) < 0) {
if (errno != ESRCH && errno != EEXIST) {
syslog(LOG_ERR, "writing to routing socket: %m");
return (-1);
}
}
do {
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm->rtm_version != RTM_VERSION ||
rtm->rtm_seq != seq || rtm->rtm_pid != pid));
if (l < 0)
syslog(LOG_ERR, "arptab_set: read from routing socket: %m");
return (0);
}
int getdefaultgateway(in_addr_t *addr)
{
int s, seq, l, rtm_addrs, i;
pid_t pid;
struct sockaddr so_dst, so_mask;
char *cp = m_rtmsg.m_space;
struct sockaddr *gate = NULL, *sa;
struct rt_msghdr *msg_hdr;
pid = getpid();
seq = 0;
rtm_addrs = RTA_DST | RTA_NETMASK;
memset(&so_dst, 0, sizeof(so_dst));
memset(&so_mask, 0, sizeof(so_mask));
memset(&rtm, 0, sizeof(struct rt_msghdr));
rtm.rtm_type = RTM_GET;
rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
rtm.rtm_version = RTM_VERSION;
rtm.rtm_seq = ++seq;
rtm.rtm_addrs = rtm_addrs;
so_dst.sa_family = AF_INET;
so_mask.sa_family = AF_INET;
NEXTADDR(RTA_DST, so_dst);
NEXTADDR(RTA_NETMASK, so_mask);
rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (write(s, (char *)&m_rtmsg, l) < 0) {
close(s);
return FAILED;
}
do {
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
close(s);
msg_hdr = &rtm;
cp = ((char *)(msg_hdr + 1));
if (msg_hdr->rtm_addrs) {
for (i = 1; i; i <<= 1)
if (i & msg_hdr->rtm_addrs) {
sa = (struct sockaddr *)cp;
if (i == RTA_GATEWAY )
gate = sa;
cp += sizeof(struct sockaddr);
}
} else {
return FAILED;
}
if (gate != NULL ) {
*addr = ((struct sockaddr_in *)gate)->sin_addr.s_addr;
return SUCCESS;
} else {
return FAILED;
}
}
static void
get_default_gw(Enna_Buffer *b)
{
#ifdef __FreeBSD__
int s, seq, l, pid, rtm_addrs, i;
struct sockaddr so_dst, so_mask;
char *cp = m_rtmsg.m_space;
struct sockaddr *gate = NULL, *sa;
struct rt_msghdr *rtm_aux;
pid = getpid();
seq = 0;
rtm_addrs = RTA_DST | RTA_NETMASK;
memset(&so_dst, 0, sizeof(so_dst));
memset(&so_mask, 0, sizeof(so_mask));
memset(&rtm, 0, sizeof(struct rt_msghdr));
rtm.rtm_type = RTM_GET;
rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
rtm.rtm_version = RTM_VERSION;
rtm.rtm_seq = ++seq;
rtm.rtm_addrs = rtm_addrs;
so_dst.sa_family = AF_INET;
so_dst.sa_len = sizeof(struct sockaddr_in);
so_mask.sa_family = AF_INET;
so_mask.sa_len = sizeof(struct sockaddr_in);
NEXTADDR(RTA_DST, so_dst);
NEXTADDR(RTA_NETMASK, so_mask);
rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (write(s, (char *)&m_rtmsg, l) < 0)
return;
do
{
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
}
while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
close(s);
rtm_aux = &rtm;
cp = ((char *)(rtm_aux + 1));
if (rtm_aux->rtm_addrs)
{
for (i = 1; i; i <<= 1)
if (i & rtm_aux->rtm_addrs)
{
sa = (struct sockaddr *)cp;
if (i == RTA_GATEWAY )
gate = sa;
ADVANCE(cp, sa);
}
}
else
return;
if (gate)
{
enna_buffer_append(b, "<hilight>");
enna_buffer_append(b, _("Default gateway:"));
enna_buffer_append(b, "</hilight> ");
enna_buffer_appendf(b, "%s<br>",
inet_ntoa(((struct sockaddr_in *)gate)->sin_addr));
}
#else /* __FreeBSD__ */
char devname[64];
unsigned long d, g, m;
int res, flgs, ref, use, metric, mtu, win, ir;
FILE *fp;
fp = fopen("/proc/net/route", "r");
if (!fp)
return;
if (fscanf(fp, "%*[^\n]\n") < 0) /* Skip the first line. */
return;
enna_buffer_append(b, "<hilight>");
enna_buffer_append(b, _("Default gateway:"));
enna_buffer_append(b, "</hilight> ");
res = 0;
while (1)
{
struct in_addr gw;
int r;
r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
devname, &d, &g, &flgs, &ref, &use, &metric, &m,
&mtu, &win, &ir);
if (r != 11)
if ((r < 0) && feof(fp))
break;
/* we only care about default gateway */
if (d != 0)
continue;
gw.s_addr = g;
enna_buffer_appendf(b, "%s<br>", inet_ntoa (gw));
res = 1;
break;
}
if (!res) {
enna_buffer_append(b, _("None"));
enna_buffer_append(b, "<br>");
}
fclose(fp);
#endif /* !__FreeBSD__ */
}
static int
rtmsg(int cmd)
{
static int seq;
int rlen;
struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
char *cp = m_rtmsg.m_space;
int l;
errno = 0;
bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
rtm->rtm_flags = flags;
rtm->rtm_version = RTM_VERSION;
switch (cmd) {
default:
report(LOG_ERR, "set_arp: internal wrong cmd - exiting");
exit(1);
case RTM_ADD:
case RTM_CHANGE:
rtm->rtm_addrs |= RTA_GATEWAY;
rtm->rtm_rmx.rmx_expire = expire_time;
rtm->rtm_inits = RTV_EXPIRE;
rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
sin_m.sin_other = 0;
if (doing_proxy) {
if (export_only)
sin_m.sin_other = SIN_PROXY;
else {
rtm->rtm_addrs |= RTA_NETMASK;
rtm->rtm_flags &= ~RTF_HOST;
}
}
/* FALLTHROUGH */
case RTM_GET:
rtm->rtm_addrs |= RTA_DST;
}
#define NEXTADDR(w, s) \
if (rtm->rtm_addrs & (w)) { \
bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
NEXTADDR(RTA_DST, sin_m);
NEXTADDR(RTA_GATEWAY, sdl_m);
NEXTADDR(RTA_NETMASK, so_mask);
rtm->rtm_msglen = cp - (char *)&m_rtmsg;
l = rtm->rtm_msglen;
rtm->rtm_seq = ++seq;
rtm->rtm_type = cmd;
if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
if ((errno != ESRCH) && !(errno == EEXIST && cmd == RTM_ADD)){
report(LOG_WARNING, "writing to routing socket: %s",
strerror(errno));
return (-1);
}
}
do {
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm->rtm_type != cmd || rtm->rtm_seq != seq || rtm->rtm_pid != getpid()));
if (l < 0)
report(LOG_WARNING, "arp: read from routing socket: %s\n",
strerror(errno));
return (0);
}
