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traceroute6: new applet by Leonid Lisovskiy. +1562 bytes

Browse Source 
Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Leonid Lisovskiy 2009-11-23 06:20:09 +01:00 committed by Denys Vlasenko
parent 0d56568654
commit 4c06531d5e
4 changed files with 431 additions and 112 deletions
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1
include/applets.h
View File

@ -395,6 +395,7 @@ IF_TOP(APPLET(top, _BB_DIR_USR_BIN, _BB_SUID_DROP))
IF_TOUCH(APPLET_NOFORK(touch, touch, _BB_DIR_BIN, _BB_SUID_DROP, touch))
IF_TR(APPLET(tr, _BB_DIR_USR_BIN, _BB_SUID_DROP))
IF_TRACEROUTE(APPLET(traceroute, _BB_DIR_USR_BIN, _BB_SUID_MAYBE))
IF_TRACEROUTE6(APPLET(traceroute6, _BB_DIR_USR_BIN, _BB_SUID_MAYBE))
IF_TRUE(APPLET_NOFORK(true, true, _BB_DIR_BIN, _BB_SUID_DROP, true))
IF_TTY(APPLET(tty, _BB_DIR_USR_BIN, _BB_SUID_DROP))
IF_TTYSIZE(APPLET(ttysize, _BB_DIR_USR_BIN, _BB_SUID_DROP))

27
include/usage.h
View File

@ -4648,17 +4648,18 @@
"hello world\n"
#define traceroute_trivial_usage \
"[-FIldnrv] [-f 1st_ttl] [-m max_ttl] [-p port#] [-q nqueries]\n" \
"[-46FIldnrv] [-f 1st_ttl] [-m max_ttl] [-p port#] [-q nqueries]\n" \
" [-s src_addr] [-t tos] [-w wait] [-g gateway] [-i iface]\n" \
" [-z pausemsecs] HOST [data size]"
#define traceroute_full_usage "\n\n" \
"Trace the route to HOST\n" \
"\nOptions:" \
"\n -4, -6 Force IPv4 or IPv6 hostname resolution" \
"\n -F Set the don't fragment bit" \
"\n -I Use ICMP ECHO instead of UDP datagrams" \
"\n -l Display the ttl value of the returned packet" \
"\n -d Set SO_DEBUG options to socket" \
"\n -n Print hop addresses numerically rather than symbolically" \
"\n -n Print numeric addresses" \
"\n -r Bypass the normal routing tables and send directly to a host" \
"\n -v Verbose" \
"\n -m max_ttl Max time-to-live (max number of hops)" \
@ -4668,9 +4669,29 @@
"\n -s src_addr IP address to use as the source address" \
"\n -t tos Type-of-service in probe packets (default 0)" \
"\n -w wait Time in seconds to wait for a response" \
"\n (default 3 sec)" \
"\n (default 3)" \
"\n -g Loose source route gateway (8 max)" \
#define traceroute6_trivial_usage \
"[-dnrv] [-m max_ttl] [-p port#] [-q nqueries]\n" \
" [-s src_addr] [-t tos] [-w wait] [-i iface]\n" \
" HOST [data size]"
#define traceroute6_full_usage "\n\n" \
"Trace the route to HOST\n" \
"\nOptions:" \
"\n -d Set SO_DEBUG options to socket" \
"\n -n Print numeric addresses" \
"\n -r Bypass the normal routing tables and send directly to a host" \
"\n -v Verbose" \
"\n -m max_ttl Max time-to-live (max number of hops)" \
"\n -p port# Base UDP port number used in probes" \
"\n (default is 33434)" \
"\n -q nqueries Number of probes per 'ttl' (default 3)" \
"\n -s src_addr IP address to use as the source address" \
"\n -t tos Type-of-service in probe packets (default 0)" \
"\n -w wait Time in seconds to wait for a response" \
"\n (default 3)" \
#define true_trivial_usage \
""
#define true_full_usage "\n\n" \

7
networking/Config.in
View File

@ -888,6 +888,13 @@ config TRACEROUTE
help
Utility to trace the route of IP packets.
config TRACEROUTE6
bool "traceroute6"
default n
depends on FEATURE_IPV6 && TRACEROUTE
help
Utility to trace the route of IPv6 packets.
config FEATURE_TRACEROUTE_VERBOSE
bool "Enable verbose output"
default n

508
networking/traceroute.c
View File

@ -22,6 +22,23 @@
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* traceroute6
*
* Modified for NRL 4.4BSD IPv6 release.
* 07/31/96 bgp
*
* Modified for Linux IPv6 by Pedro Roque <roque@di.fc.ul.pt>
* 31/07/1996
*
* As ICMP error messages for IPv6 now include more than 8 bytes
* UDP datagrams are now sent via an UDP socket instead of magic
* RAW socket tricks.
*
* Converted to busybox applet by Leonid Lisovskiy <lly@sf.net>
* 2009-11-16
*/
/*
* traceroute host - trace the route ip packets follow going to "host".
*
@ -231,7 +248,8 @@
#define OPT_STRING "FIlnrdvxt:i:m:p:q:s:w:z:f:" \
IF_FEATURE_TRACEROUTE_SOURCE_ROUTE("g:")
IF_FEATURE_TRACEROUTE_SOURCE_ROUTE("g:") \
"4" IF_TRACEROUTE6("6")
enum {
OPT_DONT_FRAGMNT = (1 << 0), /* F */
OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */
@ -250,6 +268,9 @@ enum {
OPT_WAITTIME = (1 << 14), /* w */
OPT_PAUSE_MS = (1 << 15), /* z */
OPT_FIRST_TTL = (1 << 16), /* f */
OPT_SOURCE_ROUTE = (1 << 17) * ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE, /* g */
OPT_IPV4 = (1 << (17+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)), /* 4 */
OPT_IPV6 = (1 << (18+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)) * ENABLE_TRACEROUTE6, /* 6 */
};
#define verbose (option_mask32 & OPT_VERBOSE)
@ -267,13 +288,21 @@ struct outdata_t {
struct timeval tv_UNUSED PACKED; /* time packet left */
};
#if ENABLE_TRACEROUTE6
struct outdata6_t {
uint32_t ident6;
uint32_t seq6;
struct timeval tv_UNUSED PACKED; /* time packet left */
};
#endif
struct globals {
struct ip *outip;
struct outdata_t *outdata;
len_and_sockaddr *dest_lsa;
int packlen; /* total length of packet */
int pmtu; /* Path MTU Discovery (RFC1191) */
uint16_t ident;
uint32_t ident;
uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */
int waittime; // 5; /* time to wait for response (in seconds) */
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
@ -314,18 +343,30 @@ struct globals {
#define outudp ((struct udphdr *)(outip + 1))
/* libbb candidate? tftp uses this idiom too */
static len_and_sockaddr* dup_sockaddr(const len_and_sockaddr *lsa)
{
len_and_sockaddr *new_lsa = xzalloc(LSA_LEN_SIZE + lsa->len);
memcpy(new_lsa, lsa, LSA_LEN_SIZE + lsa->len);
return new_lsa;
}
static int
wait_for_reply(struct sockaddr_in *fromp)
wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to)
{
struct pollfd pfd[1];
int read_len = 0;
socklen_t fromlen = sizeof(*fromp);
pfd[0].fd = rcvsock;
pfd[0].events = POLLIN;
if (safe_poll(pfd, 1, waittime * 1000) > 0)
read_len = recvfrom(rcvsock, recv_pkt, sizeof(recv_pkt), 0,
(struct sockaddr *)fromp, &fromlen);
if (safe_poll(pfd, 1, waittime * 1000) > 0) {
read_len = recv_from_to(rcvsock,
recv_pkt, sizeof(recv_pkt),
/*flags:*/ 0,
&from_lsa->u.sa, to, from_lsa->len);
}
return read_len;
}
@ -369,20 +410,30 @@ send_probe(int seq, int ttl)
void *out;
/* Payload */
outdata->seq = seq;
outdata->ttl = ttl;
#if ENABLE_TRACEROUTE6
if (dest_lsa->u.sa.sa_family == AF_INET6) {
struct outdata6_t *pkt = (struct outdata6_t *) outip;
pkt->ident6 = htonl(ident);
pkt->seq6 = htonl(seq);
/*gettimeofday(&pkt->tv, &tz);*/
} else
#endif
{
outdata->seq = seq;
outdata->ttl = ttl;
// UNUSED: was storing gettimeofday's result there, but never ever checked it
/*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
/*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
if (option_mask32 & OPT_USE_ICMP) {
outicmp->icmp_seq = htons(seq);
if (option_mask32 & OPT_USE_ICMP) {
outicmp->icmp_seq = htons(seq);
/* Always calculate checksum for icmp packets */
outicmp->icmp_cksum = 0;
outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
packlen - (sizeof(*outip) + optlen));
if (outicmp->icmp_cksum == 0)
outicmp->icmp_cksum = 0xffff;
/* Always calculate checksum for icmp packets */
outicmp->icmp_cksum = 0;
outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
packlen - (sizeof(*outip) + optlen));
if (outicmp->icmp_cksum == 0)
outicmp->icmp_cksum = 0xffff;
}
}
//BUG! verbose is (x & OPT_VERBOSE), not a counter!
@ -411,21 +462,32 @@ send_probe(int seq, int ttl)
}
#endif
#if defined(IP_TTL)
if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
(char *)&ttl, sizeof(ttl)) < 0) {
bb_perror_msg_and_die("setsockopt ttl %d", ttl);
}
#if ENABLE_TRACEROUTE6
if (dest_lsa->u.sa.sa_family == AF_INET6) {
res = setsockopt(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
if (res < 0)
bb_perror_msg_and_die("setsockopt UNICAST_HOPS %d", ttl);
out = outip;
len = packlen;
} else
#endif
len = packlen - sizeof(*outip);
if (option_mask32 & OPT_USE_ICMP)
out = outicmp;
else {
out = outdata;
len -= sizeof(*outudp);
set_nport(dest_lsa, htons(port + seq));
{
#if defined(IP_TTL)
if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
(char *)&ttl, sizeof(ttl)) < 0) {
bb_perror_msg_and_die("setsockopt ttl %d", ttl);
}
#endif
len = packlen - sizeof(*outip);
if (option_mask32 & OPT_USE_ICMP)
out = outicmp;
else {
out = outdata;
len -= sizeof(*outudp);
set_nport(dest_lsa, htons(port + seq));
}
}
res = xsendto(sndsock, out, len, &dest_lsa->u.sa, dest_lsa->len);
if (res != len) {
bb_info_msg("sent %d octets, ret=%d", len, res);
@ -436,7 +498,7 @@ send_probe(int seq, int ttl)
/*
* Convert an ICMP "type" field to a printable string.
*/
static inline const char *
static const char *
pr_type(unsigned char t)
{
static const char *const ttab[] = {
@ -446,7 +508,23 @@ pr_type(unsigned char t)
"Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
"Info Reply", "Mask Request", "Mask Reply"
};
# if ENABLE_TRACEROUTE6
static const char *const ttab6[] = {
[0] "Error", "Dest Unreachable", "Packet Too Big", "Time Exceeded",
[4] "Param Problem",
[8] "Echo Request", "Echo Reply", "Membership Query", "Membership Report",
[12] "Membership Reduction", "Router Solicit", "Router Advert", "Neighbor Solicit",
[16] "Neighbor Advert", "Redirect",
};
if (dest_lsa->u.sa.sa_family == AF_INET6) {
if (t < 5)
return ttab6[t];
if (t < 128 || t > ND_REDIRECT)
return "OUT-OF-RANGE";
return ttab6[(t & 63) + 8];
}
# endif
if (t >= ARRAY_SIZE(ttab))
return "OUT-OF-RANGE";
@ -455,11 +533,11 @@ pr_type(unsigned char t)
#endif
#if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
#define packet_ok(read_len, from, seq) \
packet_ok(read_len, seq)
#define packet4_ok(read_len, from, seq) \
packet4_ok(read_len, seq)
#endif
static int
packet_ok(int read_len, const struct sockaddr_in *from, int seq)
packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
{
const struct icmp *icp;
unsigned char type, code;
@ -502,7 +580,7 @@ packet_ok(int read_len, const struct sockaddr_in *from, int seq)
&& icp->icmp_id == htons(ident)
&& icp->icmp_seq == htons(seq)
) {
return -2;
return ICMP_UNREACH_PORT+1;
}
hicmp = (struct icmp *)((unsigned char *)hip + hlen);
@ -544,6 +622,98 @@ packet_ok(int read_len, const struct sockaddr_in *from, int seq)
return 0;
}
#if ENABLE_TRACEROUTE6
# if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
#define packet_ok(read_len, from_lsa, to, seq) \
packet_ok(read_len, from_lsa, seq)
# endif
static int
packet_ok(int read_len, len_and_sockaddr *from_lsa,
struct sockaddr *to,
int seq)
{
const struct icmp6_hdr *icp;
unsigned char type, code;
if (from_lsa->u.sa.sa_family == AF_INET)
return packet4_ok(read_len, &from_lsa->u.sin, seq);
icp = (struct icmp6_hdr *) recv_pkt;
type = icp->icmp6_type;
code = icp->icmp6_code;
if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
|| type == ICMP6_DST_UNREACH
) {
struct ip6_hdr *hip;
struct udphdr *up;
int nexthdr;
hip = (struct ip6_hdr *)(icp + 1);
up = (struct udphdr *) (hip + 1);
nexthdr = hip->ip6_nxt;
if (nexthdr == IPPROTO_FRAGMENT) {
nexthdr = *(unsigned char*)up;
up++;
}
if (nexthdr == IPPROTO_UDP) {
struct outdata6_t *pkt;
pkt = (struct outdata6_t *) (up + 1);
if (ntohl(pkt->ident6) == ident
&& ntohl(pkt->seq6) == seq
) {
return (type == ICMP6_TIME_EXCEEDED ? -1 : (code<<8)+1);
}
}
}
# if ENABLE_FEATURE_TRACEROUTE_VERBOSE
if (verbose) {
unsigned char *p;
char pa1[MAXHOSTNAMELEN];
char pa2[MAXHOSTNAMELEN];
int i;
p = (unsigned char *) (icp + 1);
printf("\n%d bytes from %s to "
"%s: icmp type %d (%s) code %d\n",
read_len,
inet_ntop(AF_INET6, &from_lsa->u.sin6.sin6_addr, pa1, sizeof(pa1)),
inet_ntop(AF_INET6, &((struct sockaddr_in6*)to)->sin6_addr, pa2, sizeof(pa2)),
type, pr_type(type), icp->icmp6_code);
read_len -= sizeof(struct icmp6_hdr);
for (i = 0; i < read_len ; i++) {
if (i % 16 == 0)
printf("%04x:", i);
if (i % 4 == 0)
bb_putchar(' ');
printf("%02x", p[i]);
if ((i % 16 == 15) && (i + 1 < read_len))
bb_putchar('\n');
}
bb_putchar('\n');
}
# endif
return 0;
}
#else /* !ENABLE_TRACEROUTE6 */
static ALWAYS_INLINE int
packet_ok(int read_len, len_and_sockaddr *from_lsa,
struct sockaddr *to UNUSED_PARAM,
int seq)
{
return packet4_ok(read_len, &from_lsa->u.sin, seq);
}
#endif
/*
* Construct an Internet address representation.
* If the -n flag has been supplied, give
@ -572,17 +742,22 @@ print_inetname(const struct sockaddr *from)
}
static void
print(int read_len, const struct sockaddr_in *from)
print(int read_len, const struct sockaddr *from, const struct sockaddr *to)
{
print_inetname((const struct sockaddr*)from);
if (verbose) {
const struct ip *ip;
int hlen;
print_inetname(from);
ip = (struct ip *) recv_pkt;
hlen = ip->ip_hl << 2;
read_len -= hlen;
printf(" %d bytes to %s", read_len, inet_ntoa(ip->ip_dst));
if (verbose) {
char *ina = xmalloc_sockaddr2dotted_noport(to);
#if ENABLE_TRACEROUTE6
if (to->sa_family == AF_INET6) {
read_len -= sizeof(struct ip6_hdr);
} else
#endif
{
read_len -= ((struct ip*)recv_pkt)->ip_hl << 2;
}
printf(" %d bytes to %s", read_len, ina);
free(ina);
}
}
@ -598,9 +773,8 @@ print_delta_ms(unsigned t1p, unsigned t2p)
* [-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]
* [-w waittime] [-z pausemsecs] host [packetlen]"
*/
int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int traceroute_main(int argc UNUSED_PARAM, char **argv)
static int
common_traceroute_main(int op, char **argv)
{
int i;
int minpacket;
@ -609,7 +783,6 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
int nprobes = 3;
int first_ttl = 1;
unsigned pausemsecs = 0;
unsigned op;
char *source;
char *device;
char *tos_str;
@ -622,21 +795,30 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
llist_t *source_route_list = NULL;
int lsrr = 0;
#endif
#if ENABLE_TRACEROUTE6
sa_family_t af = AF_UNSPEC;
#else
enum { af = AF_INET };
#endif
int ttl;
int seq;
len_and_sockaddr *from_lsa;
struct sockaddr *lastaddr;
struct sockaddr *to;
INIT_G();
/* minimum 1 arg */
opt_complementary = "-1:x-x" IF_FEATURE_TRACEROUTE_SOURCE_ROUTE(":g::");
op = getopt32(argv, OPT_STRING
op |= getopt32(argv, OPT_STRING
, &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str
, &source, &waittime_str, &pausemsecs_str, &first_ttl_str
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
, &source_route_list
#endif
);
argv += optind;
#if 0 /* IGNORED */
if (op & OPT_IP_CHKSUM)
@ -681,21 +863,53 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
}
#endif
minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen;
if (!(op & OPT_USE_ICMP))
minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR;
#if ENABLE_TRACEROUTE6
if (op & OPT_IPV4)
af = AF_INET;
if (op & OPT_IPV6) {
af = AF_INET6;
minpacket = sizeof(struct outdata6_t);
} else
#endif
{
minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR
+ sizeof(*outdata) + optlen;
if (!(op & OPT_USE_ICMP))
minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR;
}
packlen = minpacket;
/* Process destination and optional packet size */
argv += optind;
if (argv[1])
packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
#if ENABLE_TRACEROUTE6
dest_lsa = xhost_and_af2sockaddr(argv[0], port, af);
af = dest_lsa->u.sa.sa_family;
#else
dest_lsa = xhost2sockaddr(argv[0], port);
#endif
/* Ensure the socket fds won't be 0, 1 or 2 */
bb_sanitize_stdio();
xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock);
#if ENABLE_TRACEROUTE6
if (af == AF_INET6) {
xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock);
# ifdef IPV6_RECVPKTINFO
setsockopt(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO,
&const_int_1, sizeof(const_int_1));
setsockopt(rcvsock, SOL_IPV6, IPV6_2292PKTINFO,
&const_int_1, sizeof(const_int_1));
# else
setsockopt(rcvsock, SOL_IPV6, IPV6_PKTINFO,
&const_int_1, sizeof(const_int_1));
# endif
} else
#endif
{
xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock);
}
#if TRACEROUTE_SO_DEBUG
if (op & OPT_DEBUG)
setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
@ -705,34 +919,45 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
&const_int_1, sizeof(const_int_1));
if (op & OPT_USE_ICMP)
xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock);
else
xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock);
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE && defined IP_OPTIONS
if (lsrr > 0) {
unsigned char optlist[MAX_IPOPTLEN];
/* final hop */
gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr;
++lsrr;
/* force 4 byte alignment */
optlist[0] = IPOPT_NOP;
/* loose source route option */
optlist[1] = IPOPT_LSRR;
i = lsrr * sizeof(gwlist[0]);
optlist[2] = i + 3;
/* pointer to LSRR addresses */
optlist[3] = IPOPT_MINOFF;
memcpy(optlist + 4, gwlist, i);
if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
(char *)optlist, i + sizeof(gwlist[0])) < 0) {
bb_perror_msg_and_die("IP_OPTIONS");
}
}
#if ENABLE_TRACEROUTE6
if (af == AF_INET6) {
static const int two = 2;
if (setsockopt(rcvsock, SOL_RAW, IPV6_CHECKSUM, &two, sizeof(two)) < 0)
bb_perror_msg_and_die("setsockopt RAW_CHECKSUM");
xmove_fd(xsocket(af, SOCK_DGRAM, 0), sndsock);
} else
#endif
{
if (op & OPT_USE_ICMP)
xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock);
else
xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock);
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE && defined IP_OPTIONS
if (lsrr > 0) {
unsigned char optlist[MAX_IPOPTLEN];
/* final hop */
gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr;
++lsrr;
/* force 4 byte alignment */
optlist[0] = IPOPT_NOP;
/* loose source route option */
optlist[1] = IPOPT_LSRR;
i = lsrr * sizeof(gwlist[0]);
optlist[2] = i + 3;
/* pointer to LSRR addresses */
optlist[3] = IPOPT_MINOFF;
memcpy(optlist + 4, gwlist, i);
if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
(char *)optlist, i + sizeof(gwlist[0])) < 0) {
bb_perror_msg_and_die("IP_OPTIONS");
}
}
#endif
}
#ifdef SO_SNDBUF
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) {
bb_perror_msg_and_die("SO_SNDBUF");
@ -759,29 +984,66 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
outip = xzalloc(packlen);
if (op & OPT_USE_ICMP) {
ident = getpid() | 0x8000;
outicmp->icmp_type = ICMP_ECHO;
outicmp->icmp_id = htons(ident);
outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR);
} else {
outdata = (struct outdata_t *)(outudp + 1);
ident = getpid();
if (af == AF_INET) {
if (op & OPT_USE_ICMP) {
ident |= 0x8000;
outicmp->icmp_type = ICMP_ECHO;
outicmp->icmp_id = htons(ident);
outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR);
} else {
outdata = (struct outdata_t *)(outudp + 1);
}
}
if (op & OPT_DEVICE) /* hmm, do we need error check? */
setsockopt_bindtodevice(sndsock, device);
if (op & OPT_SOURCE) {
#if ENABLE_TRACEROUTE6
// TODO: need xdotted_and_af2sockaddr?
len_and_sockaddr *source_lsa = xhost_and_af2sockaddr(source, 0, af);
#else
len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0);
/* Ping does this (why?) */
if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF,
&source_lsa->u.sa, source_lsa->len))
bb_error_msg_and_die("can't set multicast source interface");
#endif
/* Ping4 does this (why?) */
if (af == AF_INET)
if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF,
&source_lsa->u.sa, source_lsa->len))
bb_error_msg_and_die("can't set multicast source interface");
//TODO: we can query source port we bound to,
// and check it in replies... if we care enough
xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
free(source_lsa);
}
#if ENABLE_TRACEROUTE6
else if (af == AF_INET6) {
//TODO: why we don't do it for IPv4?
len_and_sockaddr *source_lsa;
int probe_fd = xsocket(af, SOCK_DGRAM, 0);
if (op & OPT_DEVICE)
setsockopt_bindtodevice(probe_fd, device);
set_nport(dest_lsa, htons(1025));
/* dummy connect. makes kernel pick source IP (and port) */
xconnect(probe_fd, &dest_lsa->u.sa, dest_lsa->len);
/* read IP and port */
source_lsa = get_sock_lsa(probe_fd);
if (source_lsa == NULL)
bb_error_msg_and_die("can't get probe addr");
close(probe_fd);
/* bind our sockets to this IP (but not port) */
set_nport(source_lsa, 0);
xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
xbind(rcvsock, &source_lsa->u.sa, source_lsa->len);
free(source_lsa);
}
#endif
/* Revert to non-privileged user after opening sockets */
xsetgid(getgid());
@ -793,11 +1055,11 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
printf(" from %s", source);
printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
from_lsa = dup_sockaddr(dest_lsa);
lastaddr = xzalloc(dest_lsa->len);
to = xzalloc(dest_lsa->len);
seq = 0;
for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
//TODO: make it protocol agnostic (get rid of sockaddr_in)
struct sockaddr_in from;
uint32_t lastaddr = 0;
int probe;
int unreachable = 0; /* counter */
int gotlastaddr = 0; /* flags */
@ -819,44 +1081,55 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
send_probe(++seq, ttl);
first = 0;
while ((read_len = wait_for_reply(&from)) != 0) {
while ((read_len = wait_for_reply(from_lsa, to)) != 0) {
t2 = monotonic_us();
i = packet_ok(read_len, &from, seq);
i = packet_ok(read_len, from_lsa, to, seq);
/* Skip short packet */
if (i == 0)
continue;
if (!gotlastaddr
|| from.sin_addr.s_addr != lastaddr
|| (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0)
) {
print(read_len, &from);
lastaddr = from.sin_addr.s_addr;
print(read_len, &from_lsa->u.sa, to);
memcpy(lastaddr, &from_lsa->u.sa, from_lsa->len);
gotlastaddr = 1;
}
print_delta_ms(t1, t2);
ip = (struct ip *)recv_pkt;
if (op & OPT_TTL_FLAG)
printf(" (%d)", ip->ip_ttl);
if (i == -2) {
if (ip->ip_ttl <= 1)
printf(" !");
got_there = 1;
break;
}
if (from_lsa->u.sa.sa_family == AF_INET)
if (op & OPT_TTL_FLAG)
printf(" (%d)", ip->ip_ttl);
/* time exceeded in transit */
if (i == -1)
break;
i--;
switch (i) {
#if ENABLE_TRACEROUTE6
case ICMP6_DST_UNREACH_NOPORT << 8:
got_there = 1;
break;
#endif
case ICMP_UNREACH_PORT:
if (ip->ip_ttl <= 1)
printf(" !");
got_there = 1;
break;
case ICMP_UNREACH_NET:
#if ENABLE_TRACEROUTE6 && (ICMP6_DST_UNREACH_NOROUTE != ICMP_UNREACH_NET)
case ICMP6_DST_UNREACH_NOROUTE << 8:
#endif
printf(" !N");
++unreachable;
break;
case ICMP_UNREACH_HOST:
#if ENABLE_TRACEROUTE6
case ICMP6_DST_UNREACH_ADDR << 8:
#endif
printf(" !H");
++unreachable;
break;
@ -869,6 +1142,9 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
++unreachable;
break;
case ICMP_UNREACH_SRCFAIL:
#if ENABLE_TRACEROUTE6
case ICMP6_DST_UNREACH_ADMIN << 8:
#endif
printf(" !S");
++unreachable;
break;
@ -924,3 +1200,17 @@ int traceroute_main(int argc UNUSED_PARAM, char **argv)
return 0;
}
int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int traceroute_main(int argc UNUSED_PARAM, char **argv)
{
return common_traceroute_main(0, argv);
}
#if ENABLE_TRACEROUTE6
int traceroute6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int traceroute6_main(int argc UNUSED_PARAM, char **argv)
{
return common_traceroute_main(OPT_IPV6, argv);
}
#endif