--- trunk/mkinitrd-magellan/busybox/networking/traceroute.c 2010/04/29 20:38:48 983 +++ trunk/mkinitrd-magellan/busybox/networking/traceroute.c 2010/05/30 11:32:42 984 @@ -23,6 +23,23 @@ */ /* + * 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". * * Attempt to trace the route an ip packet would follow to some @@ -211,141 +228,89 @@ #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" - -/* - * Definitions for internet protocol version 4. - * Per RFC 791, September 1981. - */ -#define IPVERSION 4 - #ifndef IPPROTO_ICMP -/* Grrrr.... */ -#define IPPROTO_ICMP 1 +# define IPPROTO_ICMP 1 #endif #ifndef IPPROTO_IP -#define IPPROTO_IP 0 +# define IPPROTO_IP 0 #endif -/* - * Overlay for ip header used by other protocols (tcp, udp). - */ -struct ipovly { - unsigned char ih_x1[9]; /* (unused) */ - unsigned char ih_pr; /* protocol */ - short ih_len; /* protocol length */ - struct in_addr ih_src; /* source internet address */ - struct in_addr ih_dst; /* destination internet address */ -}; -/* - * UDP kernel structures and variables. - */ -struct udpiphdr { - struct ipovly ui_i; /* overlaid ip structure */ - struct udphdr ui_u; /* udp header */ +#define OPT_STRING "FIlnrdvxt:i:m:p:q:s:w:z:f:" \ + 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 */ + OPT_TTL_FLAG = (1 << 2), /* l */ + OPT_ADDR_NUM = (1 << 3), /* n */ + OPT_BYPASS_ROUTE = (1 << 4), /* r */ + OPT_DEBUG = (1 << 5), /* d */ + OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */ + OPT_IP_CHKSUM = (1 << 7), /* x */ + OPT_TOS = (1 << 8), /* t */ + OPT_DEVICE = (1 << 9), /* i */ + OPT_MAX_TTL = (1 << 10), /* m */ + OPT_PORT = (1 << 11), /* p */ + OPT_NPROBES = (1 << 12), /* q */ + OPT_SOURCE = (1 << 13), /* s */ + 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 ui_next ui_i.ih_next -#define ui_prev ui_i.ih_prev -#define ui_x1 ui_i.ih_x1 -#define ui_pr ui_i.ih_pr -#define ui_len ui_i.ih_len -#define ui_src ui_i.ih_src -#define ui_dst ui_i.ih_dst -#define ui_sport ui_u.uh_sport -#define ui_dport ui_u.uh_dport -#define ui_ulen ui_u.uh_ulen -#define ui_sum ui_u.uh_sum - - -/* Host name and address list */ -struct hostinfo { - char *name; - int n; - uint32_t *addrs; +#define verbose (option_mask32 & OPT_VERBOSE) + +enum { + SIZEOF_ICMP_HDR = 8, + rcvsock = 3, /* receive (icmp) socket file descriptor */ + sndsock = 4, /* send (udp/icmp) socket file descriptor */ }; /* Data section of the probe packet */ -typedef struct outdata { +struct outdata_t { unsigned char seq; /* sequence number of this packet */ unsigned char ttl; /* ttl packet left with */ // UNUSED. Retaining to have the same packet size. struct timeval tv_UNUSED PACKED; /* time packet left */ -} outdata_t; - -struct IFADDRLIST { - uint32_t addr; - char device[sizeof(struct ifreq)]; }; - -/* Keep in sync with getopt32 call! */ -#define OPT_DONT_FRAGMNT (1<<0) /* F */ -#define OPT_USE_ICMP (1<<1) /* I */ -#define OPT_TTL_FLAG (1<<2) /* l */ -#define OPT_ADDR_NUM (1<<3) /* n */ -#define OPT_BYPASS_ROUTE (1<<4) /* r */ -#define OPT_DEBUG (1<<5) /* d */ -#define OPT_VERBOSE (1<<6) /* v */ -#define OPT_IP_CHKSUM (1<<7) /* x */ -#define OPT_TOS (1<<8) /* t */ -#define OPT_DEVICE (1<<9) /* i */ -#define OPT_MAX_TTL (1<<10) /* m */ -#define OPT_PORT (1<<11) /* p */ -#define OPT_NPROBES (1<<12) /* q */ -#define OPT_SOURCE (1<<13) /* s */ -#define OPT_WAITTIME (1<<14) /* w */ -#define OPT_PAUSE_MS (1<<15) /* z */ -#define OPT_FIRST_TTL (1<<16) /* f */ - -#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP -/* use icmp echo instead of udp packets */ -#define useicmp (option_mask32 & OPT_USE_ICMP) -#endif -#if ENABLE_FEATURE_TRACEROUTE_VERBOSE -#define verbose (option_mask32 & OPT_VERBOSE) +#if ENABLE_TRACEROUTE6 +struct outdata6_t { + uint32_t ident6; + uint32_t seq6; + struct timeval tv_UNUSED PACKED; /* time packet left */ +}; #endif -#define nflag (option_mask32 & OPT_ADDR_NUM) - struct globals { - struct ip *outip; /* last output (udp) packet */ - struct udphdr *outudp; /* last output (udp) packet */ - struct outdata *outdata; /* last output (udp) packet */ - -#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP - struct icmp *outicmp; /* last output (icmp) packet */ -#endif - - int rcvsock; /* receive (icmp) socket file descriptor */ - int sndsock; /* send (udp/icmp) socket file descriptor */ - + struct ip *outip; + struct outdata_t *outdata; + len_and_sockaddr *dest_lsa; int packlen; /* total length of packet */ - int minpacket; /* min ip packet size */ - int maxpacket; // 32 * 1024; /* max ip packet size */ int pmtu; /* Path MTU Discovery (RFC1191) */ - - char *hostname; - - 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) */ - int doipcksum; // 1; /* calculate ip checksums by default */ - #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE int optlen; /* length of ip options */ #else #define optlen 0 #endif - - struct sockaddr_storage whereto; /* Who to try to reach */ - struct sockaddr_storage wherefrom; /* Who we are */ - /* last inbound (icmp) packet */ - unsigned char packet[512]; + 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))) @@ -356,217 +321,53 @@ #define G (*ptr_to_globals) #define outip (G.outip ) -#define outudp (G.outudp ) #define outdata (G.outdata ) -#define outicmp (G.outicmp ) -#define rcvsock (G.rcvsock ) -#define sndsock (G.sndsock ) +#define dest_lsa (G.dest_lsa ) #define packlen (G.packlen ) -#define minpacket (G.minpacket) -#define maxpacket (G.maxpacket) #define pmtu (G.pmtu ) -#define hostname (G.hostname ) #define ident (G.ident ) #define port (G.port ) #define waittime (G.waittime ) -#define doipcksum (G.doipcksum) #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE -#define optlen (G.optlen ) +# define optlen (G.optlen ) #endif -#define packet (G.packet ) -#define whereto (G.whereto ) -#define wherefrom (G.wherefrom) +#define recv_pkt (G.recv_pkt ) #define gwlist (G.gwlist ) #define INIT_G() do { \ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ - maxpacket = 32 * 1024; \ port = 32768 + 666; \ waittime = 5; \ - doipcksum = 1; \ } while (0) +#define outicmp ((struct icmp *)(outip + 1)) +#define outudp ((struct udphdr *)(outip + 1)) -/* - * Return the interface list - */ -static int -ifaddrlist(struct IFADDRLIST **ipaddrp) -{ - enum { IFREQ_BUFSIZE = (32 * 1024) / sizeof(struct ifreq) }; - - int fd, nipaddr; -#ifdef HAVE_SOCKADDR_SA_LEN - int n; -#endif - struct ifreq *ifrp, *ifend, *ifnext; - struct sockaddr_in *addr_sin; - struct IFADDRLIST *al; - struct ifconf ifc; - struct ifreq ifr; - /* Was on stack, but 32k is a bit too much: */ - struct ifreq *ibuf = xmalloc(IFREQ_BUFSIZE * sizeof(ibuf[0])); - struct IFADDRLIST *st_ifaddrlist; - fd = xsocket(AF_INET, SOCK_DGRAM, 0); - - ifc.ifc_len = IFREQ_BUFSIZE * sizeof(ibuf[0]); - ifc.ifc_buf = (caddr_t)ibuf; - - if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 - || ifc.ifc_len < (int)sizeof(struct ifreq) - ) { - if (errno == EINVAL) - bb_error_msg_and_die( - "SIOCGIFCONF: ifreq struct too small (%u bytes)", - (unsigned)(IFREQ_BUFSIZE * sizeof(ibuf[0]))); - bb_perror_msg_and_die("SIOCGIFCONF"); - } - ifrp = ibuf; - ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); - - nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq)); - st_ifaddrlist = xzalloc(nipaddr * sizeof(struct IFADDRLIST)); - al = st_ifaddrlist; - nipaddr = 0; - - for (; ifrp < ifend; ifrp = ifnext) { -#ifdef HAVE_SOCKADDR_SA_LEN - n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); - if (n < sizeof(*ifrp)) - ifnext = ifrp + 1; - else - ifnext = (struct ifreq *)((char *)ifrp + n); - if (ifrp->ifr_addr.sa_family != AF_INET) - continue; -#else - ifnext = ifrp + 1; -#endif - /* - * Need a template to preserve address info that is - * used below to locate the next entry. (Otherwise, - * SIOCGIFFLAGS stomps over it because the requests - * are returned in a union.) - */ - strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); - if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { - if (errno == ENXIO) - continue; - bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s", - (int)sizeof(ifr.ifr_name), ifr.ifr_name); - } - - /* Must be up */ - if ((ifr.ifr_flags & IFF_UP) == 0) - continue; - - safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1); -#ifdef sun - /* Ignore sun virtual interfaces */ - if (strchr(al->device, ':') != NULL) - continue; -#endif - ioctl_or_perror_and_die(fd, SIOCGIFADDR, (char *)&ifr, - "SIOCGIFADDR: %s", al->device); - - addr_sin = (struct sockaddr_in *)&ifr.ifr_addr; - al->addr = addr_sin->sin_addr.s_addr; - ++al; - ++nipaddr; - } - if (nipaddr == 0) - bb_error_msg_and_die("can't find any network interfaces"); - - free(ibuf); - close(fd); - *ipaddrp = st_ifaddrlist; - return nipaddr; -} - - -static void -setsin(struct sockaddr_in *addr_sin, uint32_t addr) -{ - memset(addr_sin, 0, sizeof(*addr_sin)); -#ifdef HAVE_SOCKADDR_SA_LEN - addr_sin->sin_len = sizeof(*addr_sin); -#endif - addr_sin->sin_family = AF_INET; - addr_sin->sin_addr.s_addr = addr; -} - - -/* - * Return the source address for the given destination address - */ -static void -findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from) +/* libbb candidate? tftp uses this idiom too */ +static len_and_sockaddr* dup_sockaddr(const len_and_sockaddr *lsa) { - int i, n; - FILE *f; - uint32_t mask; - uint32_t dest, tmask; - struct IFADDRLIST *al; - char buf[256], tdevice[256], device[256]; - - f = xfopen_for_read("/proc/net/route"); - - /* Find the appropriate interface */ - n = 0; - mask = 0; - device[0] = '\0'; - while (fgets(buf, sizeof(buf), f) != NULL) { - ++n; - if (n == 1 && strncmp(buf, "Iface", 5) == 0) - continue; - i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x", - tdevice, &dest, &tmask); - if (i != 3) - bb_error_msg_and_die("junk in buffer"); - if ((to->sin_addr.s_addr & tmask) == dest - && (tmask > mask || mask == 0) - ) { - mask = tmask; - strcpy(device, tdevice); - } - } - fclose(f); - - if (device[0] == '\0') - bb_error_msg_and_die("can't find interface"); - - /* Get the interface address list */ - n = ifaddrlist(&al); - - /* Find our appropriate source address */ - for (i = n; i > 0; --i, ++al) - if (strcmp(device, al->device) == 0) - break; - if (i <= 0) - bb_error_msg_and_die("can't find interface %s", device); - - setsin(from, al->addr); + len_and_sockaddr *new_lsa = xzalloc(LSA_LEN_SIZE + lsa->len); + memcpy(new_lsa, lsa, LSA_LEN_SIZE + lsa->len); + return new_lsa; } -/* -"Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n" -"\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n" -"\t[-w waittime] [-z pausemsecs] host [packetlen]" - -*/ static int -wait_for_reply(int sock, struct sockaddr_in *fromp) +wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to) { struct pollfd pfd[1]; - int cc = 0; - socklen_t fromlen = sizeof(*fromp); + int read_len = 0; - pfd[0].fd = sock; + pfd[0].fd = rcvsock; pfd[0].events = POLLIN; - if (safe_poll(pfd, 1, waittime * 1000) > 0) - cc = recvfrom(sock, packet, sizeof(packet), 0, - (struct sockaddr *)fromp, &fromlen); - return cc; + 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; } /* @@ -581,12 +382,12 @@ 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. + * 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) { + while (nleft > 1) { sum += *w++; nleft -= 2; } @@ -595,80 +396,48 @@ if (nleft == 1) sum += *(unsigned char *)w; - /* - * add back carry outs from top 16 bits to low 16 bits - */ + /* 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; } - static void send_probe(int seq, int ttl) { - int cc; - struct udpiphdr *ui, *oui; - struct ip tip; - - outip->ip_ttl = ttl; - outip->ip_id = htons(ident + seq); - - /* - * In most cases, the kernel will recalculate the ip checksum. - * But we must do it anyway so that the udp checksum comes out - * right. - */ - if (doipcksum) { - outip->ip_sum = - in_cksum((uint16_t *)outip, sizeof(*outip) + optlen); - if (outip->ip_sum == 0) - outip->ip_sum = 0xffff; - } + int len, res; + void *out; /* Payload */ - 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 ENABLE_FEATURE_TRACEROUTE_USE_ICMP - if (useicmp) - outicmp->icmp_seq = htons(seq); - else -#endif - outudp->dest = htons(port + seq); - -#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP - if (useicmp) { - /* 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 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 - if (doipcksum) { - /* Checksum (we must save and restore ip header) */ - tip = *outip; - ui = (struct udpiphdr *)outip; - oui = (struct udpiphdr *)&tip; - /* Easier to zero and put back things that are ok */ - memset((char *)ui, 0, sizeof(ui->ui_i)); - ui->ui_src = oui->ui_src; - ui->ui_dst = oui->ui_dst; - ui->ui_pr = oui->ui_pr; - ui->ui_len = outudp->len; - outudp->check = 0; - outudp->check = in_cksum((uint16_t *)ui, packlen); - if (outudp->check == 0) - outudp->check = 0xffff; - *outip = tip; + { + 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); + + /* 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 ENABLE_FEATURE_TRACEROUTE_VERBOSE +//BUG! verbose is (x & OPT_VERBOSE), not a counter! +#if 0 //ENABLE_FEATURE_TRACEROUTE_VERBOSE /* XXX undocumented debugging hack */ if (verbose > 1) { const uint16_t *sp; @@ -693,25 +462,40 @@ } #endif -#if !defined(IP_HDRINCL) && 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 - - cc = xsendto(sndsock, (char *)outip, - packlen, (struct sockaddr *)&whereto, sizeof(whereto)); - if (cc != packlen) { - bb_info_msg("wrote %s %d chars, ret=%d", hostname, packlen, cc); + { +#if defined IP_TTL + res = setsockopt(sndsock, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); + if (res < 0) + bb_perror_msg_and_die("setsockopt ttl %d", ttl); +#endif + out = outicmp; + len = packlen - sizeof(*outip); + if (!(option_mask32 & OPT_USE_ICMP)) { + 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); } #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[] = { @@ -721,8 +505,24 @@ "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 (t > 18) + 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"; return ttab[t]; @@ -730,71 +530,76 @@ #endif #if !ENABLE_FEATURE_TRACEROUTE_VERBOSE -#define packet_ok(buf, cc, from, seq) \ - packet_ok(buf, cc, seq) +#define packet4_ok(read_len, from, seq) \ + packet4_ok(read_len, seq) #endif static int -packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq) +packet4_ok(int read_len, const struct sockaddr_in *from, int seq) { - struct icmp *icp; + const struct icmp *icp; unsigned char type, code; int hlen; - struct ip *ip; + const struct ip *ip; - ip = (struct ip *) buf; + 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; - icp = (struct icmp *)(buf + hlen); + read_len -= hlen; + icp = (struct icmp *)(recv_pkt + hlen); type = icp->icmp_type; code = icp->icmp_code; /* Path MTU Discovery (RFC1191) */ - if (code != ICMP_UNREACH_NEEDFRAG) - pmtu = 0; - else { + pmtu = 0; + if (code == ICMP_UNREACH_NEEDFRAG) pmtu = ntohs(icp->icmp_nextmtu); - } - if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) || - type == ICMP_UNREACH || type == ICMP_ECHOREPLY) { - struct ip *hip; - struct udphdr *up; + + if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) + || type == ICMP_UNREACH + || type == ICMP_ECHOREPLY + ) { + const struct ip *hip; + const struct udphdr *up; hip = &icp->icmp_ip; hlen = hip->ip_hl << 2; -#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP - if (useicmp) { + if (option_mask32 & OPT_USE_ICMP) { struct icmp *hicmp; /* XXX */ - if (type == ICMP_ECHOREPLY && - icp->icmp_id == htons(ident) && - icp->icmp_seq == htons(seq)) - return -2; + if (type == ICMP_ECHOREPLY + && icp->icmp_id == htons(ident) + && icp->icmp_seq == htons(seq) + ) { + return ICMP_UNREACH_PORT+1; + } hicmp = (struct icmp *)((unsigned char *)hip + hlen); - /* XXX 8 is a magic number */ - if (hlen + 8 <= cc && - hip->ip_p == IPPROTO_ICMP && - hicmp->icmp_id == htons(ident) && - hicmp->icmp_seq == htons(seq)) + if (hlen + SIZEOF_ICMP_HDR <= read_len + && hip->ip_p == IPPROTO_ICMP + && hicmp->icmp_id == htons(ident) + && hicmp->icmp_seq == htons(seq) + ) { return (type == ICMP_TIMXCEED ? -1 : code + 1); - } else -#endif - { - up = (struct udphdr *)((unsigned char *)hip + hlen); - /* XXX 8 is a magic number */ - if (hlen + 12 <= cc && - hip->ip_p == IPPROTO_UDP && - up->source == htons(ident) && - up->dest == htons(port + seq)) + } + } else { + up = (struct udphdr *)((char *)hip + hlen); + 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, +// and thus can't check it here in the reply + /* && up->source == htons(ident) */ + && up->dest == htons(port + seq) + ) { return (type == ICMP_TIMXCEED ? -1 : code + 1); + } } } #if ENABLE_FEATURE_TRACEROUTE_VERBOSE @@ -804,178 +609,219 @@ printf("\n%d bytes from %s to " "%s: icmp type %d (%s) code %d\n", - cc, 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)) + read_len, inet_ntoa(from->sin_addr), + inet_ntoa(ip->ip_dst), + type, pr_type(type), icp->icmp_code); + 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 nflag has been supplied, give + * If the -n flag has been supplied, give * numeric value, otherwise try for symbolic name. */ static void -print_inetname(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 (nflag) - printf(" %s", ina); - else { + if (option_mask32 & OPT_ADDR_NUM) { + printf(" %s", ina); + } 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); + } + printf(" %s (%s)", (n ? n : ina), ina); free(n); } + free(ina); } static void -print(unsigned char *buf, int cc, struct sockaddr_in *from) +print(int read_len, const struct sockaddr *from, const struct sockaddr *to) { - struct ip *ip; - int hlen; - - ip = (struct ip *) buf; - hlen = ip->ip_hl << 2; - cc -= hlen; - print_inetname(from); -#if ENABLE_FEATURE_TRACEROUTE_VERBOSE - if (verbose) - printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst)); -#endif -} - - -static struct hostinfo * -gethostinfo(const char *host) -{ - int n; - struct hostent *hp; - struct hostinfo *hi; - char **p; - uint32_t addr, *ap; - - hi = xzalloc(sizeof(*hi)); - addr = inet_addr(host); - if (addr != 0xffffffff) { - hi->name = xstrdup(host); - hi->n = 1; - hi->addrs = xzalloc(sizeof(hi->addrs[0])); - hi->addrs[0] = addr; - return hi; - } - - hp = xgethostbyname(host); - if (hp->h_addrtype != AF_INET || hp->h_length != 4) - bb_perror_msg_and_die("bad host %s", host); - hi->name = xstrdup(hp->h_name); - for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p) - continue; - hi->n = n; - hi->addrs = xzalloc(n * sizeof(hi->addrs[0])); - for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p) - memcpy(ap, *p, sizeof(*ap)); - return hi; -} -static void -freehostinfo(struct hostinfo *hi) -{ - free(hi->name); - free(hi->addrs); - free(hi); -} - -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE -static void -getaddr(uint32_t *ap, const char *host) -{ - struct hostinfo *hi; - - hi = gethostinfo(host); - *ap = hi->addrs[0]; - freehostinfo(hi); -} + 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); + } +} static void print_delta_ms(unsigned t1p, unsigned t2p) { unsigned tt = t2p - t1p; - printf(" %u.%03u ms", tt/1000, tt%1000); + printf(" %u.%03u ms", tt / 1000, tt % 1000); } -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 code, n; - unsigned char *outp; - uint32_t *ap; - struct sockaddr_in *from; - struct sockaddr_in *to; - struct hostinfo *hi; - int ttl, probe, i; - int seq = 0; + int i; + int minpacket; int tos = 0; - char *tos_str; + int max_ttl = 30; + int nprobes = 3; + int first_ttl = 1; + unsigned pausemsecs = 0; char *source; - unsigned op; -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - int lsrr = 0; -#endif - uint16_t off = 0; - struct IFADDRLIST *al; char *device; - int max_ttl = 30; + char *tos_str; char *max_ttl_str; char *port_str; - int nprobes = 3; char *nprobes_str; char *waittime_str; - unsigned pausemsecs = 0; char *pausemsecs_str; - int first_ttl = 1; char *first_ttl_str; #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE llist_t *source_route_list = NULL; + int lsrr = 0; #endif - - INIT_G(); - from = (struct sockaddr_in *)&wherefrom; - to = (struct sockaddr_in *)&whereto; - - //opterr = 0; -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - opt_complementary = "x-x:g::"; +#if ENABLE_TRACEROUTE6 + sa_family_t af; #else - opt_complementary = "x-x"; + enum { af = AF_INET }; #endif + int ttl; + int seq; + len_and_sockaddr *from_lsa; + struct sockaddr *lastaddr; + struct sockaddr *to; - op = getopt32(argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:" -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - "g:" -#endif + INIT_G(); + + /* minimum 1 arg */ + opt_complementary = "-1:x-x" IF_FEATURE_TRACEROUTE_SOURCE_ROUTE(":g::"); + 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 (op & OPT_DONT_FRAGMNT) - off = IP_DF; - if (op & OPT_IP_CHKSUM) { - doipcksum = 0; +#if 0 /* IGNORED */ + if (op & OPT_IP_CHKSUM) bb_error_msg("warning: ip checksums disabled"); - } +#endif if (op & OPT_TOS) tos = xatou_range(tos_str, 0, 255); if (op & OPT_MAX_TTL) @@ -989,71 +835,73 @@ * set the ip source address of the outbound * probe (e.g., on a multi-homed host). */ - if (getuid()) - bb_error_msg_and_die("-s %s: permission denied", source); + if (getuid() != 0) + 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, 255); + 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); - getaddr(gwlist + lsrr, llist_pop(&source_route_list)); + 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 - if (first_ttl > max_ttl) { - bb_error_msg_and_die( - "first ttl (%d) may not be greater than max ttl (%d)", - first_ttl, max_ttl); - } - - minpacket = sizeof(*outip) + sizeof(*outdata) + optlen; - -#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP - if (useicmp) - minpacket += 8; /* XXX magic number */ - else -#endif - minpacket += sizeof(*outudp); - packlen = minpacket; /* minimum sized packet */ - /* Process destination and optional packet size */ - switch (argc - optind) { - - case 2: - packlen = xatoul_range(argv[optind + 1], minpacket, maxpacket); - /* Fall through */ - - case 1: - hostname = argv[optind]; - hi = gethostinfo(hostname); - setsin(to, hi->addrs[0]); - if (hi->n > 1) - bb_error_msg("warning: %s has multiple addresses; using %s", - hostname, inet_ntoa(to->sin_addr)); - hostname = hi->name; - hi->name = NULL; - freehostinfo(hi); - break; - - default: - bb_show_usage(); - } + minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen; + if (!(op & OPT_USE_ICMP)) + minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR; +#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 outdata6_t); +#else + dest_lsa = xhost2sockaddr(argv[0], port); +#endif + packlen = minpacket; + if (argv[1]) + packlen = xatoul_range(argv[1], minpacket, 32 * 1024); /* Ensure the socket fds won't be 0, 1 or 2 */ bb_sanitize_stdio(); - rcvsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP); +#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) @@ -1064,52 +912,59 @@ setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)); - sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW); +#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; -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE -#if defined(IP_OPTIONS) - if (lsrr > 0) { - unsigned char optlist[MAX_IPOPTLEN]; - - /* final hop */ - gwlist[lsrr] = to->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"); + /* 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 } -#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"); } #endif -#ifdef IP_HDRINCL - if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, &const_int_1, sizeof(const_int_1)) < 0 - && errno != ENOPROTOOPT - ) { - bb_perror_msg_and_die("IP_HDRINCL"); - } -#else #ifdef IP_TOS - if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) { + if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) { bb_perror_msg_and_die("setsockopt tos %d", tos); } #endif +#ifdef IP_DONTFRAG + if (op & OPT_DONT_FRAGMNT) + setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG, + &const_int_1, sizeof(const_int_1)); #endif #if TRACEROUTE_SO_DEBUG if (op & OPT_DEBUG) @@ -1120,230 +975,236 @@ setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)); - /* Revert to non-privileged user after opening sockets */ - xsetgid(getgid()); - xsetuid(getuid()); - outip = xzalloc(packlen); - outip->ip_v = IPVERSION; - if (tos_str) - outip->ip_tos = tos; - outip->ip_len = htons(packlen); - outip->ip_off = htons(off); - outp = (unsigned char *)(outip + 1); - outip->ip_dst = to->sin_addr; - - outip->ip_hl = (outp - (unsigned char *)outip) >> 2; - ident = (getpid() & 0xffff) | 0x8000; -#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP - if (useicmp) { - outip->ip_p = IPPROTO_ICMP; - outicmp = (struct icmp *)outp; - outicmp->icmp_type = ICMP_ECHO; - outicmp->icmp_id = htons(ident); - outdata = (outdata_t *)(outp + 8); /* XXX magic number */ - } else -#endif - { - outip->ip_p = IPPROTO_UDP; - outudp = (struct udphdr *)outp; - outudp->source = htons(ident); - outudp->len = htons((uint16_t)(packlen - (sizeof(*outip) + optlen))); - outdata = (outdata_t *)(outudp + 1); - } - - /* Get the interface address list */ - n = ifaddrlist(&al); - - /* Look for a specific device */ - if (op & OPT_DEVICE) { - for (i = n; i > 0; --i, ++al) - if (strcmp(device, al->device) == 0) - goto found_dev; - bb_error_msg_and_die("can't find interface %s", device); - } - found_dev: + ident = getpid(); - /* Determine our source address */ - if (!(op & OPT_SOURCE)) { - /* - * If a device was specified, use the interface address. - * Otherwise, try to determine our source address. - */ - if (op & OPT_DEVICE) - setsin(from, al->addr); - findsaddr(to, from); - } else { - hi = gethostinfo(source); - source = hi->name; - hi->name = NULL; - /* - * If the device was specified make sure it - * corresponds to the source address specified. - * Otherwise, use the first address (and warn if - * there are more than one). - */ - if (op & OPT_DEVICE) { - for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap) - if (*ap == al->addr) - goto found_dev2; - bb_error_msg_and_die("%s is not on interface %s", - source, device); - found_dev2: - setsin(from, *ap); + 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 { - setsin(from, hi->addrs[0]); - if (hi->n > 1) - bb_error_msg( - "warning: %s has multiple addresses; using %s", - source, inet_ntoa(from->sin_addr)); + outdata = (struct outdata_t *)(outudp + 1); } - freehostinfo(hi); } - outip->ip_src = from->sin_addr; -#ifndef IP_HDRINCL - xbind(sndsock, (struct sockaddr *)from, sizeof(*from)); + 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); +#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); + set_nport(dest_lsa, 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, 0); + xbind(sndsock, &source_lsa->u.sa, source_lsa->len); + xbind(rcvsock, &source_lsa->u.sa, source_lsa->len); + + free(source_lsa); + } #endif - printf("traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr)); + /* 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)); if (op & OPT_SOURCE) printf(" from %s", source); printf(", %d hops max, %d byte packets\n", max_ttl, packlen); - fflush(stdout); + 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) { - uint32_t lastaddr = 0; - int gotlastaddr = 0; + int probe; + int unreachable = 0; /* counter */ + int gotlastaddr = 0; /* flags */ int got_there = 0; - int unreachable = 0; - int sentfirst = 0; + int first = 1; - printf("%2d ", ttl); + printf("%2d", ttl); for (probe = 0; probe < nprobes; ++probe) { - int cc; + int read_len; unsigned t1; unsigned t2; struct ip *ip; - if (sentfirst && pausemsecs > 0) + if (!first && pausemsecs > 0) usleep(pausemsecs * 1000); + fflush_all(); + t1 = monotonic_us(); send_probe(++seq, ttl); - ++sentfirst; - while ((cc = wait_for_reply(rcvsock, from)) != 0) { + + first = 0; + while ((read_len = wait_for_reply(from_lsa, to)) != 0) { t2 = monotonic_us(); - i = packet_ok(packet, cc, 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) { - print(packet, cc, from); - lastaddr = from->sin_addr.s_addr; - ++gotlastaddr; + + if (!gotlastaddr + || (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0) + ) { + 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 *)packet; - if (op & OPT_TTL_FLAG) - printf(" (%d)", ip->ip_ttl); - if (i == -2) { - if (ip->ip_ttl <= 1) - printf(" !"); - ++got_there; - break; - } + ip = (struct ip *)recv_pkt; + + 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; - code = i - 1; - switch (code) { - + 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; + got_there = 1; break; case ICMP_UNREACH_NET: - ++unreachable; +#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: - ++unreachable; +#if ENABLE_TRACEROUTE6 + case ICMP6_DST_UNREACH_ADDR << 8: +#endif printf(" !H"); + ++unreachable; break; - case ICMP_UNREACH_PROTOCOL: - ++got_there; printf(" !P"); + got_there = 1; break; - case ICMP_UNREACH_NEEDFRAG: - ++unreachable; printf(" !F-%d", pmtu); + ++unreachable; break; - case ICMP_UNREACH_SRCFAIL: - ++unreachable; +#if ENABLE_TRACEROUTE6 + case ICMP6_DST_UNREACH_ADMIN << 8: +#endif printf(" !S"); + ++unreachable; break; - case ICMP_UNREACH_FILTER_PROHIB: case ICMP_UNREACH_NET_PROHIB: /* misuse */ - ++unreachable; printf(" !A"); + ++unreachable; break; - case ICMP_UNREACH_HOST_PROHIB: - ++unreachable; printf(" !C"); + ++unreachable; break; - case ICMP_UNREACH_HOST_PRECEDENCE: - ++unreachable; printf(" !V"); + ++unreachable; break; - case ICMP_UNREACH_PRECEDENCE_CUTOFF: - ++unreachable; printf(" !C"); + ++unreachable; break; - case ICMP_UNREACH_NET_UNKNOWN: case ICMP_UNREACH_HOST_UNKNOWN: - ++unreachable; printf(" !U"); + ++unreachable; break; - case ICMP_UNREACH_ISOLATED: - ++unreachable; printf(" !I"); + ++unreachable; break; - case ICMP_UNREACH_TOSNET: case ICMP_UNREACH_TOSHOST: - ++unreachable; printf(" !T"); + ++unreachable; break; - default: + printf(" !<%d>", i); ++unreachable; - printf(" !<%d>", code); break; } break; } - if (cc == 0) - printf(" *"); - (void)fflush(stdout); + /* there was no packet at all? */ + if (read_len == 0) + printf(" *"); } bb_putchar('\n'); - if (got_there || - (unreachable > 0 && unreachable >= nprobes - 1)) + if (got_there + || (unreachable > 0 && unreachable >= nprobes - 1) + ) { break; + } } + 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