X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Ftraceroute.c;h=d9c62f7f966dab909189030162333bae7a4d4a53;hb=95f7953f2c46c7b9c799250aa8dc6eb10cc5c726;hp=244a74d6d28b0f7238bb5299da99719e0b932a61;hpb=766c10c386f5f4c6e01fa2d2797f52809db25ef4;p=oweals%2Fbusybox.git diff --git a/networking/traceroute.c b/networking/traceroute.c index 244a74d6d..d9c62f7f9 100644 --- a/networking/traceroute.c +++ b/networking/traceroute.c @@ -12,16 +12,33 @@ * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: - * ``This product includes software developed by the University of California, + * ''This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED + * THIS SOFTWARE IS PROVIDED ''AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * 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 + * 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 + * 2009-11-16 + */ + /* * traceroute host - trace the route ip packets follow going to "host". * @@ -192,25 +209,109 @@ * -- Van Jacobson (van@ee.lbl.gov) * Tue Dec 20 03:50:13 PST 1988 */ +//config:config TRACEROUTE +//config: bool "traceroute (11 kb)" +//config: default y +//config: select PLATFORM_LINUX +//config: help +//config: Utility to trace the route of IP packets. +//config: +//config:config TRACEROUTE6 +//config: bool "traceroute6 (12 kb)" +//config: default y +//config: depends on FEATURE_IPV6 +//config: help +//config: Utility to trace the route of IPv6 packets. +//config: +//config:config FEATURE_TRACEROUTE_VERBOSE +//config: bool "Enable verbose output" +//config: default y +//config: depends on TRACEROUTE || TRACEROUTE6 +//config: help +//config: Add some verbosity to traceroute. This includes among other things +//config: hostnames and ICMP response types. +//config: +//config:config FEATURE_TRACEROUTE_USE_ICMP +//config: bool "Enable -I option (use ICMP instead of UDP)" +//config: default y +//config: depends on TRACEROUTE || TRACEROUTE6 + +/* Needs socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), therefore BB_SUID_MAYBE: */ +//applet:IF_TRACEROUTE(APPLET(traceroute, BB_DIR_USR_BIN, BB_SUID_MAYBE)) +//applet:IF_TRACEROUTE6(APPLET(traceroute6, BB_DIR_USR_BIN, BB_SUID_MAYBE)) + +//kbuild:lib-$(CONFIG_TRACEROUTE) += traceroute.o +//kbuild:lib-$(CONFIG_TRACEROUTE6) += traceroute.o + +//usage:#define traceroute_trivial_usage +//usage: "[-"IF_TRACEROUTE6("46")"FIlnrv] [-f 1ST_TTL] [-m MAXTTL] [-q PROBES] [-p PORT]\n" +//usage: " [-t TOS] [-w WAIT_SEC] [-s SRC_IP] [-i IFACE]\n" +//usage: " [-z PAUSE_MSEC] HOST [BYTES]" +//usage:#define traceroute_full_usage "\n\n" +//usage: "Trace the route to HOST\n" +//usage: IF_TRACEROUTE6( +//usage: "\n -4,-6 Force IP or IPv6 name resolution" +//usage: ) +//usage: "\n -F Set don't fragment bit" +//usage: IF_FEATURE_TRACEROUTE_USE_ICMP( +//usage: "\n -I Use ICMP ECHO instead of UDP datagrams" +//usage: ) +//usage: "\n -l Display TTL value of the returned packet" +//Currently disabled (TRACEROUTE_SO_DEBUG==0) +////usage: "\n -d Set SO_DEBUG options to socket" +//usage: "\n -n Print numeric addresses" +//usage: "\n -r Bypass routing tables, send directly to HOST" +//usage: IF_FEATURE_TRACEROUTE_VERBOSE( +//usage: "\n -v Verbose" +//usage: ) +//usage: "\n -f N First number of hops (default 1)" +//usage: "\n -m N Max number of hops" +//usage: "\n -q N Number of probes per hop (default 3)" +//usage: "\n -p N Base UDP port number used in probes" +//usage: "\n (default 33434)" +//usage: "\n -s IP Source address" +//usage: "\n -i IFACE Source interface" +//usage: "\n -t N Type-of-service in probe packets (default 0)" +//usage: "\n -w SEC Time to wait for a response (default 3)" +//usage: "\n -g IP Loose source route gateway (8 max)" +//usage: +//usage:#define traceroute6_trivial_usage +//usage: "[-nrv] [-m MAXTTL] [-q PROBES] [-p PORT]\n" +//usage: " [-t TOS] [-w WAIT_SEC] [-s SRC_IP] [-i IFACE]\n" +//usage: " HOST [BYTES]" +//usage:#define traceroute6_full_usage "\n\n" +//usage: "Trace the route to HOST\n" +//Currently disabled (TRACEROUTE_SO_DEBUG==0) +////usage: "\n -d Set SO_DEBUG options to socket" +//usage: "\n -n Print numeric addresses" +//usage: "\n -r Bypass routing tables, send directly to HOST" +//usage: IF_FEATURE_TRACEROUTE_VERBOSE( +//usage: "\n -v Verbose" +//usage: ) +//usage: "\n -m N Max number of hops" +//usage: "\n -q N Number of probes per hop (default 3)" +//usage: "\n -p N Base UDP port number used in probes" +//usage: "\n (default 33434)" +//usage: "\n -s IP Source address" +//usage: "\n -i IFACE Source interface" +//usage: "\n -t N Type-of-service in probe packets (default 0)" +//usage: "\n -w SEC Time wait for a response (default 3)" #define TRACEROUTE_SO_DEBUG 0 -/* TODO: undefs were uncommented - ??! we have config system for that! */ -/* probably ok to remove altogether */ -//#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE -//#define CONFIG_FEATURE_TRACEROUTE_VERBOSE -//#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE -//#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE -//#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP -//#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP - - #include #include #include #include #include #include +#if ENABLE_FEATURE_IPV6 +# include +# include +# ifndef SOL_IPV6 +# define SOL_IPV6 IPPROTO_IPV6 +# endif +#endif #include "libbb.h" #include "inet_common.h" @@ -222,7 +323,10 @@ # define IPPROTO_IP 0 #endif -/* Keep in sync with getopt32 call! */ + +#define OPT_STRING \ + "FIlnrdvxt:i:m:p:q:s:w:z:f:" \ + "4" IF_TRACEROUTE6("6") enum { OPT_DONT_FRAGMNT = (1 << 0), /* F */ OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */ @@ -241,6 +345,8 @@ enum { OPT_WAITTIME = (1 << 14), /* w */ OPT_PAUSE_MS = (1 << 15), /* z */ OPT_FIRST_TTL = (1 << 16), /* f */ + OPT_IPV4 = (1 << 17), /* 4 */ + OPT_IPV6 = (1 << 18) * ENABLE_TRACEROUTE6, /* 6 */ }; #define verbose (option_mask32 & OPT_VERBOSE) @@ -258,27 +364,27 @@ 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 { + /* Pointer to entire malloced IP packet, "packlen" bytes long: */ struct ip *outip; + /* Pointer to ICMP or UDP payload (not header): */ struct outdata_t *outdata; + len_and_sockaddr *dest_lsa; int packlen; /* total length of packet */ int pmtu; /* Path MTU Discovery (RFC1191) */ - uint16_t ident; - uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */ + uint32_t ident; + uint16_t port; // 33434; /* start udp dest port # for probe packets */ int waittime; // 5; /* time to wait for response (in seconds) */ -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - int optlen; /* length of ip options */ -#else -#define optlen 0 -#endif unsigned char recv_pkt[512]; /* last inbound (icmp) packet */ -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - /* Maximum number of gateways (include room for one noop) */ -#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t))) - /* loose source route gateway list (including room for final destination) */ - uint32_t gwlist[NGATEWAYS + 1]; -#endif }; #define G (*ptr_to_globals) @@ -290,14 +396,11 @@ struct globals { #define ident (G.ident ) #define port (G.port ) #define waittime (G.waittime ) -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE -# define optlen (G.optlen ) -#endif #define recv_pkt (G.recv_pkt ) #define gwlist (G.gwlist ) #define INIT_G() do { \ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ - port = 32768 + 666; \ + port = 33434; \ waittime = 5; \ } while (0) @@ -306,51 +409,26 @@ struct globals { static int -wait_for_reply(struct sockaddr_in *fromp) +wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to, unsigned *timestamp_us, int *left_ms) { struct pollfd pfd[1]; - int cc = 0; - socklen_t fromlen = sizeof(*fromp); + int read_len = 0; pfd[0].fd = rcvsock; pfd[0].events = POLLIN; - if (safe_poll(pfd, 1, waittime * 1000) > 0) - cc = recvfrom(rcvsock, recv_pkt, sizeof(recv_pkt), 0, - (struct sockaddr *)fromp, &fromlen); - return cc; -} - -/* - * Checksum routine for Internet Protocol family headers (C Version) - */ -static uint16_t -in_cksum(uint16_t *addr, int len) -{ - int nleft = len; - uint16_t *w = addr; - uint16_t answer; - int sum = 0; - - /* - * Our algorithm is simple, using a 32 bit accumulator (sum), - * we add sequential 16 bit words to it, and at the end, fold - * back all the carry bits from the top 16 bits into the lower - * 16 bits. - */ - while (nleft > 1) { - sum += *w++; - nleft -= 2; + if (*left_ms >= 0 && safe_poll(pfd, 1, *left_ms) > 0) { + unsigned t; + + read_len = recv_from_to(rcvsock, + recv_pkt, sizeof(recv_pkt), + /*flags:*/ MSG_DONTWAIT, + &from_lsa->u.sa, to, from_lsa->len); + t = monotonic_us(); + *left_ms -= (t - *timestamp_us) / 1000; + *timestamp_us = t; } - /* mop up an odd byte, if necessary */ - if (nleft == 1) - sum += *(unsigned char *)w; - - /* add back carry outs from top 16 bits to low 16 bits */ - sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ - sum += (sum >> 16); /* add carry */ - answer = ~sum; /* truncate to 16 bits */ - return answer; + return read_len; } static void @@ -360,20 +438,32 @@ 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 *) outdata; + 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));*/ - - if (option_mask32 & OPT_USE_ICMP) { - outicmp->icmp_seq = htons(seq); + /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/ - /* 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; + if (option_mask32 & OPT_USE_ICMP) { + outicmp->icmp_seq = htons(seq); + + /* Always calculate checksum for icmp packets */ + outicmp->icmp_cksum = 0; + outicmp->icmp_cksum = inet_cksum( + (uint16_t *)outicmp, + ((char*)outip + packlen) - (char*)outicmp + ); + if (outicmp->icmp_cksum == 0) + outicmp->icmp_cksum = 0xffff; + } } //BUG! verbose is (x & OPT_VERBOSE), not a counter! @@ -402,33 +492,38 @@ 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); - } + out = outdata; +#if ENABLE_TRACEROUTE6 + if (dest_lsa->u.sa.sa_family == AF_INET6) { + res = setsockopt_int(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, ttl); + if (res != 0) + bb_perror_msg_and_die("setsockopt(%s) %d", "UNICAST_HOPS", ttl); + } 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 + res = setsockopt_int(sndsock, IPPROTO_IP, IP_TTL, ttl); + if (res != 0) + bb_perror_msg_and_die("setsockopt(%s) %d", "TTL", ttl); +#endif + if (option_mask32 & OPT_USE_ICMP) + out = outicmp; } - res = xsendto(sndsock, out, len, - (struct sockaddr *)&dest_lsa->u.sa, dest_lsa->len); - if (res != len) { - bb_info_msg("sent %d octets, ret=%d", len, res); + + if (!(option_mask32 & OPT_USE_ICMP)) { + set_nport(&dest_lsa->u.sa, htons(port + seq)); } + len = ((char*)outip + packlen) - (char*)out; + res = xsendto(sndsock, out, len, &dest_lsa->u.sa, dest_lsa->len); + if (res != len) + bb_error_msg("sent %d octets, ret=%d", len, res); } #if ENABLE_FEATURE_TRACEROUTE_VERBOSE /* * 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[] = { @@ -438,7 +533,23 @@ 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"; @@ -447,11 +558,11 @@ pr_type(unsigned char t) #endif #if !ENABLE_FEATURE_TRACEROUTE_VERBOSE -#define packet_ok(cc, from, seq) \ - packet_ok(cc, seq) +#define packet4_ok(read_len, from, seq) \ + packet4_ok(read_len, seq) #endif static int -packet_ok(int cc, 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; @@ -460,15 +571,15 @@ packet_ok(int cc, const struct sockaddr_in *from, int seq) ip = (struct ip *) recv_pkt; hlen = ip->ip_hl << 2; - if (cc < hlen + ICMP_MINLEN) { + if (read_len < hlen + ICMP_MINLEN) { #if ENABLE_FEATURE_TRACEROUTE_VERBOSE if (verbose) - printf("packet too short (%d bytes) from %s\n", cc, + printf("packet too short (%d bytes) from %s\n", read_len, inet_ntoa(from->sin_addr)); #endif return 0; } - cc -= hlen; + read_len -= hlen; icp = (struct icmp *)(recv_pkt + hlen); type = icp->icmp_type; code = icp->icmp_code; @@ -494,11 +605,11 @@ packet_ok(int cc, 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); - if (hlen + SIZEOF_ICMP_HDR <= cc + if (hlen + SIZEOF_ICMP_HDR <= read_len && hip->ip_p == IPPROTO_ICMP && hicmp->icmp_id == htons(ident) && hicmp->icmp_seq == htons(seq) @@ -507,7 +618,7 @@ packet_ok(int cc, const struct sockaddr_in *from, int seq) } } else { up = (struct udphdr *)((char *)hip + hlen); - if (hlen + 12 <= cc + if (hlen + 12 <= read_len && hip->ip_p == IPPROTO_UDP // Off: since we do not form the entire IP packet, // but defer it to kernel, we can't set source port, @@ -526,50 +637,153 @@ packet_ok(int cc, const struct sockaddr_in *from, int seq) printf("\n%d bytes from %s to " "%s: icmp type %d (%s) code %d\n", - cc, inet_ntoa(from->sin_addr), + read_len, inet_ntoa(from->sin_addr), inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code); - for (i = 4; i < cc; i += sizeof(*lp)) + for (i = 4; i < read_len; i += sizeof(*lp)) printf("%2d: x%8.8x\n", i, *lp++); } #endif 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 IF_NOT_FEATURE_TRACEROUTE_VERBOSE(UNUSED_PARAM), + 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 * numeric value, otherwise try for symbolic name. */ static void -print_inetname(const struct sockaddr_in *from) +print_inetname(const struct sockaddr *from) { - const char *ina; + char *ina = xmalloc_sockaddr2dotted_noport(from); - ina = inet_ntoa(from->sin_addr); - if (option_mask32 & OPT_ADDR_NUM) + if (option_mask32 & OPT_ADDR_NUM) { printf(" %s", ina); - else { + } else { char *n = NULL; - if (from->sin_addr.s_addr != INADDR_ANY) + + if (from->sa_family != AF_INET + || ((struct sockaddr_in*)from)->sin_addr.s_addr != INADDR_ANY + ) { + /* Try to reverse resolve if it is not 0.0.0.0 */ n = xmalloc_sockaddr2host_noport((struct sockaddr*)from); + } printf(" %s (%s)", (n ? n : ina), ina); free(n); } + free(ina); } static void -print(int cc, const struct sockaddr_in *from) +print(int read_len, const struct sockaddr *from, const struct sockaddr *to) { print_inetname(from); - if (verbose) { - const struct ip *ip; - int hlen; - ip = (struct ip *) recv_pkt; - hlen = ip->ip_hl << 2; - cc -= hlen; - printf(" %d bytes to %s", cc, 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 + { + struct ip *ip4packet = (struct ip*)recv_pkt; + read_len -= ip4packet->ip_hl << 2; + } + printf(" %d bytes to %s", read_len, ina); + free(ina); } } @@ -581,23 +795,21 @@ print_delta_ms(unsigned t1p, unsigned t2p) } /* -Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl] -[-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, char **argv) + * Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl] + * [-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos] + * [-w waittime] [-z pausemsecs] host [packetlen]" + */ +static int +common_traceroute_main(int op, char **argv) { int minpacket; - int ttl, i; - int seq = 0; +#ifdef IP_TOS int tos = 0; +#endif int max_ttl = 30; int nprobes = 3; int first_ttl = 1; unsigned pausemsecs = 0; - unsigned op; char *source; char *device; char *tos_str; @@ -607,36 +819,36 @@ int traceroute_main(int argc, char **argv) char *waittime_str; char *pausemsecs_str; char *first_ttl_str; -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - llist_t *source_route_list = NULL; - int lsrr = 0; + char *dest_str; +#if ENABLE_TRACEROUTE6 + sa_family_t af; +#else + enum { af = AF_INET }; #endif + int ttl; + int seq; + len_and_sockaddr *from_lsa; + struct sockaddr *lastaddr; + struct sockaddr *to; INIT_G(); -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - opt_complementary = "x-x:g::"; -#else - opt_complementary = "x-x"; -#endif - - op = getopt32(argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:" -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - "g:" -#endif + /* minimum 1 arg */ + opt_complementary = "-1:x-x"; + 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) bb_error_msg("warning: ip checksums disabled"); #endif +#ifdef IP_TOS if (op & OPT_TOS) tos = xatou_range(tos_str, 0, 255); +#endif if (op & OPT_MAX_TTL) max_ttl = xatou_range(max_ttl_str, 1, 255); if (op & OPT_PORT) @@ -649,216 +861,269 @@ int traceroute_main(int argc, char **argv) * probe (e.g., on a multi-homed host). */ if (getuid() != 0) - bb_error_msg_and_die("you must be root to use -s"); + bb_error_msg_and_die(bb_msg_you_must_be_root); } if (op & OPT_WAITTIME) - waittime = xatou_range(waittime_str, 2, 24 * 60 * 60); + waittime = xatou_range(waittime_str, 1, 24 * 60 * 60); if (op & OPT_PAUSE_MS) pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000); if (op & OPT_FIRST_TTL) first_ttl = xatou_range(first_ttl_str, 1, max_ttl); -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - if (source_route_list) { - while (source_route_list) { - len_and_sockaddr *lsa; - - if (lsrr >= NGATEWAYS) - bb_error_msg_and_die("no more than %d gateways", NGATEWAYS); - lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET); - gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr; - free(lsa); - ++lsrr; - } - optlen = (lsrr + 1) * sizeof(gwlist[0]); - } -#endif - - minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen; + /* Process destination and optional packet size */ + minpacket = sizeof(struct ip) + + SIZEOF_ICMP_HDR + + sizeof(struct outdata_t); if (!(op & OPT_USE_ICMP)) - minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR; + minpacket = sizeof(struct ip) + + sizeof(struct udphdr) + + sizeof(struct outdata_t); +#if ENABLE_TRACEROUTE6 + af = AF_UNSPEC; + if (op & OPT_IPV4) + af = AF_INET; + if (op & OPT_IPV6) + af = AF_INET6; + dest_lsa = xhost_and_af2sockaddr(argv[0], port, af); + af = dest_lsa->u.sa.sa_family; + if (af == AF_INET6) + minpacket = sizeof(struct ip6_hdr) + + sizeof(struct udphdr) + + sizeof(struct outdata6_t); +#else + dest_lsa = xhost2sockaddr(argv[0], port); +#endif packlen = minpacket; - - /* Process destination and optional packet size */ - argv += optind; - argc -= optind; - switch (argc) { - case 2: + if (argv[1]) packlen = xatoul_range(argv[1], minpacket, 32 * 1024); - /* Fall through */ - case 1: - dest_lsa = xhost2sockaddr(argv[0], port); - break; - default: - bb_show_usage(); - } /* 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_1(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO); + setsockopt_1(rcvsock, SOL_IPV6, IPV6_2292PKTINFO); +# else + setsockopt_1(rcvsock, SOL_IPV6, IPV6_PKTINFO); +# 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, - &const_int_1, sizeof(const_int_1)); + setsockopt_SOL_SOCKET_1(rcvsock, SO_DEBUG); #endif if (op & OPT_BYPASS_ROUTE) - 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 -#if 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"); - } + setsockopt_SOL_SOCKET_1(rcvsock, SO_DONTROUTE); + +#if ENABLE_TRACEROUTE6 + if (af == AF_INET6) { + if (setsockopt_int(rcvsock, SOL_RAW, IPV6_CHECKSUM, 2) != 0) + bb_perror_msg_and_die("setsockopt(%s)", "IPV6_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); } -#endif /* IP_OPTIONS */ -#endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */ + #ifdef SO_SNDBUF - if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) { - bb_perror_msg_and_die("SO_SNDBUF"); + if (setsockopt_SOL_SOCKET_int(sndsock, SO_SNDBUF, packlen) != 0) { + bb_perror_msg_and_die("setsockopt(%s)", "SO_SNDBUF"); } #endif #ifdef IP_TOS - if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) { - bb_perror_msg_and_die("setsockopt tos %d", tos); + if ((op & OPT_TOS) && setsockopt_int(sndsock, IPPROTO_IP, IP_TOS, tos) != 0) { + bb_perror_msg_and_die("setsockopt(%s) %d", "TOS", tos); } #endif #ifdef IP_DONTFRAG if (op & OPT_DONT_FRAGMNT) - setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG, - &const_int_1, sizeof(const_int_1)); + setsockopt_1(sndsock, IPPROTO_IP, IP_DONTFRAG); #endif #if TRACEROUTE_SO_DEBUG if (op & OPT_DEBUG) - setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, - &const_int_1, sizeof(const_int_1)); + setsockopt_SOL_SOCKET_1(sndsock, SO_DEBUG); #endif if (op & OPT_BYPASS_ROUTE) - setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, - &const_int_1, sizeof(const_int_1)); + setsockopt_SOL_SOCKET_1(sndsock, SO_DONTROUTE); 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 (!ENABLE_TRACEROUTE6 || 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 ENABLE_TRACEROUTE6 + if (af == AF_INET6) { + outdata = (void*)((char*)outip + + sizeof(struct ip6_hdr) + + sizeof(struct udphdr) + ); } +#endif 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->u.sa, htons(1025)); + /* dummy connect. makes kernel pick source IP (and port) */ + xconnect(probe_fd, &dest_lsa->u.sa, dest_lsa->len); + set_nport(&dest_lsa->u.sa, htons(port)); + + /* 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->u.sa, 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()); xsetuid(getuid()); - printf("traceroute to %s (%s)", argv[0], - xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa)); + dest_str = xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa); + printf("traceroute to %s (%s)", argv[0], dest_str); + if (ENABLE_FEATURE_CLEAN_UP) { + free(dest_str); + } + if (op & OPT_SOURCE) printf(" from %s", source); printf(", %d hops max, %d byte packets\n", max_ttl, packlen); + from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len); + 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 */ int got_there = 0; - int first = 1; printf("%2d", ttl); for (probe = 0; probe < nprobes; ++probe) { - int cc; + int read_len; unsigned t1; unsigned t2; + int left_ms; struct ip *ip; - if (!first && pausemsecs > 0) + fflush_all(); + if (probe != 0 && pausemsecs > 0) usleep(pausemsecs * 1000); - fflush(stdout); - t1 = monotonic_us(); send_probe(++seq, ttl); - first = 0; + t2 = t1 = monotonic_us(); - while ((cc = wait_for_reply(&from)) != 0) { - t2 = monotonic_us(); - i = packet_ok(cc, &from, seq); + left_ms = waittime * 1000; + while ((read_len = wait_for_reply(from_lsa, to, &t2, &left_ms)) != 0) { + int icmp_code; + + /* Recv'ed a packet, or read error */ + /* t2 = monotonic_us() - set by wait_for_reply */ + + if (read_len < 0) + continue; + icmp_code = packet_ok(read_len, from_lsa, to, seq); /* Skip short packet */ - if (i == 0) + if (icmp_code == 0) continue; + if (!gotlastaddr - || from.sin_addr.s_addr != lastaddr + || (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0) ) { - print(cc, &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) + if (icmp_code == -1) break; - i--; - switch (i) { + icmp_code--; + switch (icmp_code) { +#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; @@ -871,6 +1136,9 @@ int traceroute_main(int argc, char **argv) ++unreachable; break; case ICMP_UNREACH_SRCFAIL: +#if ENABLE_TRACEROUTE6 + case ICMP6_DST_UNREACH_ADMIN << 8: +#endif printf(" !S"); ++unreachable; break; @@ -906,15 +1174,18 @@ int traceroute_main(int argc, char **argv) ++unreachable; break; default: - printf(" !<%d>", i); + printf(" !<%d>", icmp_code); ++unreachable; break; } break; - } - if (cc == 0) + } /* while (wait and read a packet) */ + + /* there was no packet at all? */ + if (read_len == 0) printf(" *"); - } + } /* for (nprobes) */ + bb_putchar('\n'); if (got_there || (unreachable > 0 && unreachable >= nprobes - 1) @@ -922,5 +1193,28 @@ int traceroute_main(int argc, char **argv) break; } } + + if (ENABLE_FEATURE_CLEAN_UP) { + free(to); + free(lastaddr); + free(from_lsa); + } + return 0; } + +#if ENABLE_TRACEROUTE +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); +} +#endif + +#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