+/* vi: set sw=4 ts=4: */
/*
* iptunnel.c "ip tunnel"
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
*/
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <arpa/inet.h>
+//#include <sys/socket.h>
+//#include <sys/ioctl.h>
#include <netinet/ip.h>
-#include <netinet/in.h>
-
#include <net/if.h>
#include <net/if_arp.h>
-
#include <asm/types.h>
+#ifndef __constant_htons
#define __constant_htons htons
+#endif
#include <linux/if_tunnel.h>
+#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
-#include "libbb.h"
+/* Dies on error */
static int do_ioctl_get_ifindex(char *dev)
{
struct ifreq ifr;
int fd;
- strcpy(ifr.ifr_name, dev);
- fd = socket(AF_INET, SOCK_DGRAM, 0);
+ strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
if (ioctl(fd, SIOCGIFINDEX, &ifr)) {
- perror_msg("ioctl");
- return 0;
+ bb_perror_msg_and_die("SIOCGIFINDEX");
}
close(fd);
return ifr.ifr_ifindex;
struct ifreq ifr;
int fd;
- strcpy(ifr.ifr_name, dev);
- fd = socket(AF_INET, SOCK_DGRAM, 0);
+ strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
if (ioctl(fd, SIOCGIFHWADDR, &ifr)) {
- perror_msg("ioctl");
+ bb_perror_msg("SIOCGIFHWADDR");
return -1;
}
close(fd);
return ifr.ifr_addr.sa_family;
}
-
static char *do_ioctl_get_ifname(int idx)
{
- static struct ifreq ifr;
+ struct ifreq ifr;
int fd;
ifr.ifr_ifindex = idx;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
if (ioctl(fd, SIOCGIFNAME, &ifr)) {
- perror_msg("ioctl");
+ bb_perror_msg("SIOCGIFNAME");
return NULL;
}
close(fd);
- return ifr.ifr_name;
+ return xstrndup(ifr.ifr_name, sizeof(ifr.ifr_name));
}
-
-
-static int do_get_ioctl(char *basedev, struct ip_tunnel_parm *p)
+static int do_get_ioctl(const char *basedev, struct ip_tunnel_parm *p)
{
struct ifreq ifr;
int fd;
int err;
- strcpy(ifr.ifr_name, basedev);
+ strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
ifr.ifr_ifru.ifru_data = (void*)p;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
err = ioctl(fd, SIOCGETTUNNEL, &ifr);
if (err) {
- perror_msg("ioctl");
+ bb_perror_msg("SIOCGETTUNNEL");
}
close(fd);
return err;
}
-static int do_add_ioctl(int cmd, char *basedev, struct ip_tunnel_parm *p)
+/* Dies on error, otherwise returns 0 */
+static int do_add_ioctl(int cmd, const char *basedev, struct ip_tunnel_parm *p)
{
struct ifreq ifr;
int fd;
- int err;
if (cmd == SIOCCHGTUNNEL && p->name[0]) {
- strcpy(ifr.ifr_name, p->name);
+ strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
} else {
- strcpy(ifr.ifr_name, basedev);
+ strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
}
ifr.ifr_ifru.ifru_data = (void*)p;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, cmd, &ifr);
- if (err) {
- perror_msg("ioctl");
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+ if (ioctl(fd, cmd, &ifr)) {
+ bb_perror_msg_and_die("ioctl");
}
close(fd);
- return err;
+ return 0;
}
-static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
+/* Dies on error, otherwise returns 0 */
+static int do_del_ioctl(const char *basedev, struct ip_tunnel_parm *p)
{
struct ifreq ifr;
int fd;
- int err;
if (p->name[0]) {
- strcpy(ifr.ifr_name, p->name);
+ strncpy(ifr.ifr_name, p->name, sizeof(ifr.ifr_name));
} else {
- strcpy(ifr.ifr_name, basedev);
+ strncpy(ifr.ifr_name, basedev, sizeof(ifr.ifr_name));
}
ifr.ifr_ifru.ifru_data = (void*)p;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCDELTUNNEL, &ifr);
- if (err) {
- perror_msg("ioctl");
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+ if (ioctl(fd, SIOCDELTUNNEL, &ifr)) {
+ bb_perror_msg_and_die("SIOCDELTUNNEL");
}
close(fd);
- return err;
+ return 0;
}
-static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
+/* Dies on error */
+static void parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
{
int count = 0;
char medium[IFNAMSIZ];
if (strcmp(*argv, "ipip") == 0 ||
strcmp(*argv, "ip/ip") == 0) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
- error_msg("You managed to ask for more than one tunnel mode.");
- exit(-1);
+ bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
}
p->iph.protocol = IPPROTO_IPIP;
} else if (strcmp(*argv, "gre") == 0 ||
strcmp(*argv, "gre/ip") == 0) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
- error_msg("You managed to ask for more than one tunnel mode.");
- exit(-1);
+ bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
}
p->iph.protocol = IPPROTO_GRE;
} else if (strcmp(*argv, "sit") == 0 ||
strcmp(*argv, "ipv6/ip") == 0) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
- error_msg("You managed to ask for more than one tunnel mode.");
- exit(-1);
+ bb_error_msg_and_die("you managed to ask for more than one tunnel mode");
}
p->iph.protocol = IPPROTO_IPV6;
} else {
- error_msg("Cannot guess tunnel mode.");
- exit(-1);
+ bb_error_msg_and_die("cannot guess tunnel mode");
}
} else if (strcmp(*argv, "key") == 0) {
unsigned uval;
p->i_key = p->o_key = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0)<0) {
- error_msg("invalid value of \"key\"");
- exit(-1);
+ bb_error_msg_and_die("invalid value of \"key\"");
}
p->i_key = p->o_key = htonl(uval);
}
p->o_key = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0)<0) {
- error_msg("invalid value of \"ikey\"");
- exit(-1);
+ bb_error_msg_and_die("invalid value of \"ikey\"");
}
p->i_key = htonl(uval);
}
p->o_key = get_addr32(*argv);
else {
if (get_unsigned(&uval, *argv, 0)<0) {
- error_msg("invalid value of \"okey\"");
- exit(-1);
+ bb_error_msg_and_die("invalid value of \"okey\"");
}
p->o_key = htonl(uval);
}
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0) {
if (get_unsigned(&uval, *argv, 0))
- invarg("invalid TTL\n", *argv);
+ invarg(*argv, "TTL");
if (uval > 255)
- invarg("TTL must be <=255\n", *argv);
+ invarg(*argv, "TTL must be <=255");
p->iph.ttl = uval;
}
} else if (strcmp(*argv, "tos") == 0 ||
matches(*argv, "dsfield") == 0) {
- __u32 uval;
+ uint32_t uval;
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0) {
if (rtnl_dsfield_a2n(&uval, *argv))
- invarg("bad TOS value", *argv);
+ invarg(*argv, "TOS");
p->iph.tos = uval;
} else
p->iph.tos = 1;
struct ip_tunnel_parm old_p;
memset(&old_p, 0, sizeof(old_p));
if (do_get_ioctl(*argv, &old_p))
- return -1;
+ exit(1);
*p = old_p;
}
}
count++;
- argc--; argv++;
+ argc--;
+ argv++;
}
-
if (p->iph.protocol == 0) {
if (memcmp(p->name, "gre", 3) == 0)
p->iph.protocol = IPPROTO_GRE;
if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
- error_msg("Keys are not allowed with ipip and sit.");
- return -1;
+ bb_error_msg_and_die("keys are not allowed with ipip and sit");
}
}
if (medium[0]) {
p->link = do_ioctl_get_ifindex(medium);
- if (p->link == 0)
- return -1;
}
if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
p->o_flags |= GRE_KEY;
}
if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
- error_msg("Broadcast tunnel requires a source address.");
- return -1;
+ bb_error_msg_and_die("broadcast tunnel requires a source address");
}
- return 0;
}
+/* Return value becomes exitcode. It's okay to not return at all */
static int do_add(int cmd, int argc, char **argv)
{
struct ip_tunnel_parm p;
- if (parse_args(argc, argv, cmd, &p) < 0)
- return -1;
+ parse_args(argc, argv, cmd, &p);
if (p.iph.ttl && p.iph.frag_off == 0) {
- error_msg("ttl != 0 and noptmudisc are incompatible");
- return -1;
+ bb_error_msg_and_die("ttl != 0 and noptmudisc are incompatible");
}
switch (p.iph.protocol) {
return do_add_ioctl(cmd, "gre0", &p);
case IPPROTO_IPV6:
return do_add_ioctl(cmd, "sit0", &p);
- default:
- error_msg("cannot determine tunnel mode (ipip, gre or sit)");
- return -1;
+ default:
+ bb_error_msg_and_die("cannot determine tunnel mode (ipip, gre or sit)");
}
- return -1;
}
-int do_del(int argc, char **argv)
+/* Return value becomes exitcode. It's okay to not return at all */
+static int do_del(int argc, char **argv)
{
struct ip_tunnel_parm p;
- if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
- return -1;
+ parse_args(argc, argv, SIOCDELTUNNEL, &p);
switch (p.iph.protocol) {
case IPPROTO_IPIP:
return do_del_ioctl("gre0", &p);
case IPPROTO_IPV6:
return do_del_ioctl("sit0", &p);
- default:
+ default:
return do_del_ioctl(p.name, &p);
}
- return -1;
}
-void print_tunnel(struct ip_tunnel_parm *p)
+static void print_tunnel(struct ip_tunnel_parm *p)
{
char s1[256];
char s2[256];
p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
if (p->link) {
char *n = do_ioctl_get_ifname(p->link);
- if (n)
+ if (n) {
printf(" dev %s ", n);
+ free(n);
+ }
}
if (p->iph.ttl)
printf(" ttl %d ", p->iph.ttl);
if (p->iph.tos) {
SPRINT_BUF(b1);
printf(" tos");
- if (p->iph.tos&1)
+ if (p->iph.tos & 1)
printf(" inherit");
- if (p->iph.tos&~1)
- printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
- rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
+ if (p->iph.tos & ~1)
+ printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
+ rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
}
- if (!(p->iph.frag_off&htons(IP_DF)))
+ if (!(p->iph.frag_off & htons(IP_DF)))
printf(" nopmtudisc");
- if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
+ if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
printf(" key %s", s3);
- else if ((p->i_flags|p->o_flags)&GRE_KEY) {
- if (p->i_flags&GRE_KEY)
+ else if ((p->i_flags | p->o_flags) & GRE_KEY) {
+ if (p->i_flags & GRE_KEY)
printf(" ikey %s ", s3);
- if (p->o_flags&GRE_KEY)
+ if (p->o_flags & GRE_KEY)
printf(" okey %s ", s4);
}
- if (p->i_flags&GRE_SEQ)
- printf("%s Drop packets out of sequence.\n", _SL_);
- if (p->i_flags&GRE_CSUM)
- printf("%s Checksum in received packet is required.", _SL_);
- if (p->o_flags&GRE_SEQ)
- printf("%s Sequence packets on output.", _SL_);
- if (p->o_flags&GRE_CSUM)
- printf("%s Checksum output packets.", _SL_);
+ if (p->i_flags & GRE_SEQ)
+ printf("%c Drop packets out of sequence.\n", _SL_);
+ if (p->i_flags & GRE_CSUM)
+ printf("%c Checksum in received packet is required.", _SL_);
+ if (p->o_flags & GRE_SEQ)
+ printf("%c Sequence packets on output.", _SL_);
+ if (p->o_flags & GRE_CSUM)
+ printf("%c Checksum output packets.", _SL_);
}
-static int do_tunnels_list(struct ip_tunnel_parm *p)
+static void do_tunnels_list(struct ip_tunnel_parm *p)
{
char name[IFNAMSIZ];
- unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
- rx_fifo, rx_frame,
- tx_bytes, tx_packets, tx_errs, tx_drops,
- tx_fifo, tx_colls, tx_carrier, rx_multi;
+ unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
+ rx_fifo, rx_frame,
+ tx_bytes, tx_packets, tx_errs, tx_drops,
+ tx_fifo, tx_colls, tx_carrier, rx_multi;
int type;
struct ip_tunnel_parm p1;
-
char buf[512];
- FILE *fp = fopen("/proc/net/dev", "r");
+ FILE *fp = fopen_or_warn("/proc/net/dev", "r");
+
if (fp == NULL) {
- perror("fopen");
- return -1;
+ return;
}
fgets(buf, sizeof(buf), fp);
while (fgets(buf, sizeof(buf), fp) != NULL) {
char *ptr;
- buf[sizeof(buf) - 1] = 0;
- if ((ptr = strchr(buf, ':')) == NULL ||
+
+ /*buf[sizeof(buf) - 1] = 0; - fgets is safe anyway */
+ ptr = strchr(buf, ':');
+ if (ptr == NULL ||
(*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
- error_msg("Wrong format of /proc/net/dev. Sorry.");
- return -1;
+ bb_error_msg("wrong format of /proc/net/dev. Sorry");
+ return;
}
- if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
+ if (sscanf(ptr, "%lu%lu%lu%lu%lu%lu%lu%*d%lu%lu%lu%lu%lu%lu%lu",
&rx_bytes, &rx_packets, &rx_errs, &rx_drops,
&rx_fifo, &rx_frame, &rx_multi,
&tx_bytes, &tx_packets, &tx_errs, &tx_drops,
continue;
type = do_ioctl_get_iftype(name);
if (type == -1) {
- error_msg("Failed to get type of [%s]", name);
+ bb_error_msg("cannot get type of [%s]", name);
continue;
}
if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
(p->i_key && p1.i_key != p->i_key))
continue;
print_tunnel(&p1);
- printf("\n");
+ puts("");
}
- return 0;
}
+/* Return value becomes exitcode. It's okay to not return at all */
static int do_show(int argc, char **argv)
{
int err;
struct ip_tunnel_parm p;
- if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
- return -1;
+ parse_args(argc, argv, SIOCGETTUNNEL, &p);
switch (p.iph.protocol) {
- case IPPROTO_IPIP:
+ case IPPROTO_IPIP:
err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
break;
case IPPROTO_GRE:
return -1;
print_tunnel(&p);
- printf("\n");
+ puts("");
return 0;
}
+/* Return value becomes exitcode. It's okay to not return at all */
int do_iptunnel(int argc, char **argv)
{
if (argc > 0) {
} else
return do_show(0, NULL);
- error_msg("Command \"%s\" is unknown, try \"ip tunnel help\".", *argv);
- exit(-1);
+ bb_error_msg_and_die("command \"%s\" is unknown", *argv);
}