+/* 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.
- *
- * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* Changes:
*
- * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
- * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
- * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
+ * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
+ * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
+ * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <syslog.h>
-#include <fcntl.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#include <netinet/in.h>
#include <netinet/ip.h>
-#include <arpa/inet.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <asm/types.h>
-#include <linux/if.h>
-#include <linux/if_arp.h>
-#include <linux/if_tunnel.h>
+#ifndef __constant_htons
+#define __constant_htons htons
+#endif
+// FYI: #define SIOCDEVPRIVATE 0x89F0
+
+/* From linux/if_tunnel.h. #including it proved troublesome
+ * (redefiniton errors due to name collisions in linux/ and net[inet]/) */
+#define SIOCGETTUNNEL (SIOCDEVPRIVATE + 0)
+#define SIOCADDTUNNEL (SIOCDEVPRIVATE + 1)
+#define SIOCDELTUNNEL (SIOCDEVPRIVATE + 2)
+#define SIOCCHGTUNNEL (SIOCDEVPRIVATE + 3)
+//#define SIOCGETPRL (SIOCDEVPRIVATE + 4)
+//#define SIOCADDPRL (SIOCDEVPRIVATE + 5)
+//#define SIOCDELPRL (SIOCDEVPRIVATE + 6)
+//#define SIOCCHGPRL (SIOCDEVPRIVATE + 7)
+#define GRE_CSUM __constant_htons(0x8000)
+//#define GRE_ROUTING __constant_htons(0x4000)
+#define GRE_KEY __constant_htons(0x2000)
+#define GRE_SEQ __constant_htons(0x1000)
+//#define GRE_STRICT __constant_htons(0x0800)
+//#define GRE_REC __constant_htons(0x0700)
+//#define GRE_FLAGS __constant_htons(0x00F8)
+//#define GRE_VERSION __constant_htons(0x0007)
+struct ip_tunnel_parm {
+ char name[IFNAMSIZ];
+ int link;
+ uint16_t i_flags;
+ uint16_t o_flags;
+ uint32_t i_key;
+ uint32_t o_key;
+ struct iphdr iph;
+};
+/* SIT-mode i_flags */
+//#define SIT_ISATAP 0x0001
+//struct ip_tunnel_prl {
+// uint32_t addr;
+// uint16_t flags;
+// uint16_t __reserved;
+// uint32_t datalen;
+// uint32_t __reserved2;
+// /* data follows */
+//};
+///* PRL flags */
+//#define PRL_DEFAULT 0x0001
+
+#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
-#include "busybox.h"
+/* Dies on error */
static int do_ioctl_get_ifindex(char *dev)
{
struct ifreq ifr;
int fd;
- int err;
- strcpy(ifr.ifr_name, dev);
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCGIFINDEX, &ifr);
- if (err) {
- perror("ioctl");
- return 0;
- }
+ strncpy_IFNAMSIZ(ifr.ifr_name, dev);
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+ xioctl(fd, SIOCGIFINDEX, &ifr);
close(fd);
return ifr.ifr_ifindex;
}
int fd;
int err;
- strcpy(ifr.ifr_name, dev);
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCGIFHWADDR, &ifr);
- if (err) {
- perror("ioctl");
- return -1;
- }
+ strncpy_IFNAMSIZ(ifr.ifr_name, dev);
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+ err = ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr);
close(fd);
- return ifr.ifr_addr.sa_family;
+ return err ? -1 : ifr.ifr_addr.sa_family;
}
-
-static char * do_ioctl_get_ifname(int idx)
+static char *do_ioctl_get_ifname(int idx)
{
- static struct ifreq ifr;
+ struct ifreq ifr;
int fd;
int err;
ifr.ifr_ifindex = idx;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCGIFNAME, &ifr);
- if (err) {
- perror("ioctl");
- return NULL;
- }
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+ err = ioctl_or_warn(fd, SIOCGIFNAME, &ifr);
close(fd);
- return ifr.ifr_name;
+ return err ? NULL : 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_IFNAMSIZ(ifr.ifr_name, basedev);
ifr.ifr_ifru.ifru_data = (void*)p;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCGETTUNNEL, &ifr);
- if (err)
- perror("ioctl");
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+ err = ioctl_or_warn(fd, SIOCGETTUNNEL, &ifr);
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);
- else
- strcpy(ifr.ifr_name, basedev);
+ if (cmd == SIOCCHGTUNNEL && p->name[0]) {
+ strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
+ } else {
+ strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
+ }
ifr.ifr_ifru.ifru_data = (void*)p;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, cmd, &ifr);
- if (err)
- perror("ioctl");
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+#if ENABLE_IOCTL_HEX2STR_ERROR
+ /* #define magic will turn ioctl# into string */
+ if (cmd == SIOCCHGTUNNEL)
+ xioctl(fd, SIOCCHGTUNNEL, &ifr);
+ else
+ xioctl(fd, SIOCADDTUNNEL, &ifr);
+#else
+ xioctl(fd, cmd, &ifr);
+#endif
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);
- else
- strcpy(ifr.ifr_name, basedev);
+ if (p->name[0]) {
+ strncpy_IFNAMSIZ(ifr.ifr_name, p->name);
+ } else {
+ strncpy_IFNAMSIZ(ifr.ifr_name, basedev);
+ }
ifr.ifr_ifru.ifru_data = (void*)p;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- err = ioctl(fd, SIOCDELTUNNEL, &ifr);
- if (err)
- perror("ioctl");
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+ xioctl(fd, SIOCDELTUNNEL, &ifr);
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(char **argv, int cmd, struct ip_tunnel_parm *p)
{
+ static const char keywords[] ALIGN1 =
+ "mode\0""ipip\0""ip/ip\0""gre\0""gre/ip\0""sit\0""ipv6/ip\0"
+ "key\0""ikey\0""okey\0""seq\0""iseq\0""oseq\0"
+ "csum\0""icsum\0""ocsum\0""nopmtudisc\0""pmtudisc\0"
+ "remote\0""any\0""local\0""dev\0"
+ "ttl\0""inherit\0""tos\0""dsfield\0"
+ "name\0";
+ enum {
+ ARG_mode, ARG_ipip, ARG_ip_ip, ARG_gre, ARG_gre_ip, ARG_sit, ARG_ip6_ip,
+ ARG_key, ARG_ikey, ARG_okey, ARG_seq, ARG_iseq, ARG_oseq,
+ ARG_csum, ARG_icsum, ARG_ocsum, ARG_nopmtudisc, ARG_pmtudisc,
+ ARG_remote, ARG_any, ARG_local, ARG_dev,
+ ARG_ttl, ARG_inherit, ARG_tos, ARG_dsfield,
+ ARG_name
+ };
int count = 0;
char medium[IFNAMSIZ];
+ int key;
memset(p, 0, sizeof(*p));
- memset(&medium, 0, sizeof(medium));
+ medium[0] = '\0';
p->iph.version = 4;
p->iph.ihl = 5;
#ifndef IP_DF
-#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
+#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
#endif
p->iph.frag_off = htons(IP_DF);
- while (argc > 0) {
- if (strcmp(*argv, "mode") == 0) {
+ while (*argv) {
+ key = index_in_strings(keywords, *argv);
+ if (key == ARG_mode) {
NEXT_ARG();
- if (strcmp(*argv, "ipip") == 0 ||
- strcmp(*argv, "ip/ip") == 0) {
+ key = index_in_strings(keywords, *argv);
+ if (key == ARG_ipip ||
+ key == ARG_ip_ip
+ ) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
- fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
- exit(-1);
+ bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
}
p->iph.protocol = IPPROTO_IPIP;
- } else if (strcmp(*argv, "gre") == 0 ||
- strcmp(*argv, "gre/ip") == 0) {
+ } else if (key == ARG_gre ||
+ key == ARG_gre_ip
+ ) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
- fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
- exit(-1);
+ bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
}
p->iph.protocol = IPPROTO_GRE;
- } else if (strcmp(*argv, "sit") == 0 ||
- strcmp(*argv, "ipv6/ip") == 0) {
+ } else if (key == ARG_sit ||
+ key == ARG_ip6_ip
+ ) {
if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
- fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
- exit(-1);
+ bb_error_msg_and_die("%s tunnel mode", "you managed to ask for more than one");
}
p->iph.protocol = IPPROTO_IPV6;
} else {
- fprintf(stderr,"Cannot guess tunnel mode.\n");
- exit(-1);
+ bb_error_msg_and_die("%s tunnel mode", "can't guess");
}
- } else if (strcmp(*argv, "key") == 0) {
+ } else if (key == ARG_key) {
unsigned uval;
NEXT_ARG();
p->i_flags |= GRE_KEY;
if (strchr(*argv, '.'))
p->i_key = p->o_key = get_addr32(*argv);
else {
- if (get_unsigned(&uval, *argv, 0)<0) {
- fprintf(stderr, "invalid value of \"key\"\n");
- exit(-1);
- }
+ uval = get_unsigned(*argv, "key");
p->i_key = p->o_key = htonl(uval);
}
- } else if (strcmp(*argv, "ikey") == 0) {
+ } else if (key == ARG_ikey) {
unsigned uval;
NEXT_ARG();
p->i_flags |= GRE_KEY;
if (strchr(*argv, '.'))
p->o_key = get_addr32(*argv);
else {
- if (get_unsigned(&uval, *argv, 0)<0) {
- fprintf(stderr, "invalid value of \"ikey\"\n");
- exit(-1);
- }
+ uval = get_unsigned(*argv, "ikey");
p->i_key = htonl(uval);
}
- } else if (strcmp(*argv, "okey") == 0) {
+ } else if (key == ARG_okey) {
unsigned uval;
NEXT_ARG();
p->o_flags |= GRE_KEY;
if (strchr(*argv, '.'))
p->o_key = get_addr32(*argv);
else {
- if (get_unsigned(&uval, *argv, 0)<0) {
- fprintf(stderr, "invalid value of \"okey\"\n");
- exit(-1);
- }
+ uval = get_unsigned(*argv, "okey");
p->o_key = htonl(uval);
}
- } else if (strcmp(*argv, "seq") == 0) {
+ } else if (key == ARG_seq) {
p->i_flags |= GRE_SEQ;
p->o_flags |= GRE_SEQ;
- } else if (strcmp(*argv, "iseq") == 0) {
+ } else if (key == ARG_iseq) {
p->i_flags |= GRE_SEQ;
- } else if (strcmp(*argv, "oseq") == 0) {
+ } else if (key == ARG_oseq) {
p->o_flags |= GRE_SEQ;
- } else if (strcmp(*argv, "csum") == 0) {
+ } else if (key == ARG_csum) {
p->i_flags |= GRE_CSUM;
p->o_flags |= GRE_CSUM;
- } else if (strcmp(*argv, "icsum") == 0) {
+ } else if (key == ARG_icsum) {
p->i_flags |= GRE_CSUM;
- } else if (strcmp(*argv, "ocsum") == 0) {
+ } else if (key == ARG_ocsum) {
p->o_flags |= GRE_CSUM;
- } else if (strcmp(*argv, "nopmtudisc") == 0) {
+ } else if (key == ARG_nopmtudisc) {
p->iph.frag_off = 0;
- } else if (strcmp(*argv, "pmtudisc") == 0) {
+ } else if (key == ARG_pmtudisc) {
p->iph.frag_off = htons(IP_DF);
- } else if (strcmp(*argv, "remote") == 0) {
+ } else if (key == ARG_remote) {
NEXT_ARG();
- if (strcmp(*argv, "any"))
+ key = index_in_strings(keywords, *argv);
+ if (key != ARG_any)
p->iph.daddr = get_addr32(*argv);
- } else if (strcmp(*argv, "local") == 0) {
+ } else if (key == ARG_local) {
NEXT_ARG();
- if (strcmp(*argv, "any"))
+ key = index_in_strings(keywords, *argv);
+ if (key != ARG_any)
p->iph.saddr = get_addr32(*argv);
- } else if (strcmp(*argv, "dev") == 0) {
+ } else if (key == ARG_dev) {
NEXT_ARG();
- strncpy(medium, *argv, IFNAMSIZ-1);
- } else if (strcmp(*argv, "ttl") == 0) {
+ strncpy_IFNAMSIZ(medium, *argv);
+ } else if (key == ARG_ttl) {
unsigned uval;
NEXT_ARG();
- if (strcmp(*argv, "inherit") != 0) {
- if (get_unsigned(&uval, *argv, 0))
- invarg("invalid TTL\n", *argv);
+ key = index_in_strings(keywords, *argv);
+ if (key != ARG_inherit) {
+ uval = get_unsigned(*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;
+ } else if (key == ARG_tos ||
+ key == ARG_dsfield
+ ) {
+ uint32_t uval;
NEXT_ARG();
- if (strcmp(*argv, "inherit") != 0) {
+ key = index_in_strings(keywords, *argv);
+ if (key != ARG_inherit) {
if (rtnl_dsfield_a2n(&uval, *argv))
- invarg("bad TOS value", *argv);
+ invarg(*argv, "TOS");
p->iph.tos = uval;
} else
p->iph.tos = 1;
} else {
- if (strcmp(*argv, "name") == 0) {
+ if (key == ARG_name) {
NEXT_ARG();
}
if (p->name[0])
duparg2("name", *argv);
- strncpy(p->name, *argv, IFNAMSIZ);
+ strncpy_IFNAMSIZ(p->name, *argv);
if (cmd == SIOCCHGTUNNEL && count == 0) {
struct ip_tunnel_parm old_p;
memset(&old_p, 0, sizeof(old_p));
if (do_get_ioctl(*argv, &old_p))
- return -1;
+ exit(EXIT_FAILURE);
*p = old_p;
}
}
count++;
- argc--; argv++;
+ 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)) {
- fprintf(stderr, "Keys are not allowed with ipip and sit.\n");
- 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) {
- fprintf(stderr, "Broadcast tunnel requires a source address.\n");
- return -1;
+ bb_error_msg_and_die("broadcast tunnel requires a source address");
}
- return 0;
}
-
-static int do_add(int cmd, int argc, char **argv)
+/* Return value becomes exitcode. It's okay to not return at all */
+static int do_add(int cmd, char **argv)
{
struct ip_tunnel_parm p;
- if (parse_args(argc, argv, cmd, &p) < 0)
- return -1;
+ parse_args(argv, cmd, &p);
if (p.iph.ttl && p.iph.frag_off == 0) {
- fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
- 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:
- fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n");
- return -1;
+ default:
+ bb_error_msg_and_die("can't 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(char **argv)
{
struct ip_tunnel_parm p;
- if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
- return -1;
+ parse_args(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));
}
- 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;
}
-
+ /* skip headers */
fgets(buf, sizeof(buf), fp);
fgets(buf, sizeof(buf), fp);
while (fgets(buf, sizeof(buf), fp) != NULL) {
char *ptr;
- buf[sizeof(buf) - 1] = 0;
- if ((ptr = strchr(buf, ':')) == NULL ||
- (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
- fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
- return -1;
+
+ /*buf[sizeof(buf) - 1] = 0; - fgets is safe anyway */
+ ptr = strchr(buf, ':');
+ if (ptr == NULL ||
+ (*ptr++ = 0, sscanf(buf, "%s", name) != 1)
+ ) {
+ bb_error_msg("wrong format of /proc/net/dev");
+ 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) {
- fprintf(stderr, "Failed to get type of [%s]\n", name);
+ bb_error_msg("can't get type of [%s]", name);
continue;
}
if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
(p->name[0] && strcmp(p1.name, p->name)) ||
(p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
(p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
- (p->i_key && p1.i_key != p->i_key))
+ (p->i_key && p1.i_key != p->i_key)
+ ) {
continue;
+ }
print_tunnel(&p1);
- printf("\n");
+ bb_putchar('\n');
}
- return 0;
}
-static int do_show(int argc, char **argv)
+/* Return value becomes exitcode. It's okay to not return at all */
+static int do_show(char **argv)
{
int err;
struct ip_tunnel_parm p;
- if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
- return -1;
+ parse_args(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");
+ bb_putchar('\n');
return 0;
}
-int do_iptunnel(int argc, char **argv)
+/* Return value becomes exitcode. It's okay to not return at all */
+int FAST_FUNC do_iptunnel(char **argv)
{
- if (argc > 0) {
- if (matches(*argv, "add") == 0)
- return do_add(SIOCADDTUNNEL, argc-1, argv+1);
- if (matches(*argv, "change") == 0)
- return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
- if (matches(*argv, "del") == 0)
- return do_del(argc-1, argv+1);
- if (matches(*argv, "show") == 0 ||
- matches(*argv, "lst") == 0 ||
- matches(*argv, "list") == 0)
- return do_show(argc-1, argv+1);
- } else
- return do_show(0, NULL);
-
- fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv);
- exit(-1);
+ static const char keywords[] ALIGN1 =
+ "add\0""change\0""delete\0""show\0""list\0""lst\0";
+ enum { ARG_add = 0, ARG_change, ARG_del, ARG_show, ARG_list, ARG_lst };
+
+ if (*argv) {
+ int key = index_in_substrings(keywords, *argv);
+ if (key < 0)
+ invarg(*argv, applet_name);
+ argv++;
+ if (key == ARG_add)
+ return do_add(SIOCADDTUNNEL, argv);
+ if (key == ARG_change)
+ return do_add(SIOCCHGTUNNEL, argv);
+ if (key == ARG_del)
+ return do_del(argv);
+ }
+ return do_show(argv);
}
projects / oweals / busybox.git / blobdiff