diff options
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/traceroute.c | 725 |
1 files changed, 166 insertions, 559 deletions
diff --git a/networking/traceroute.c b/networking/traceroute.c index 958299aaa..244a74d6d 100644 --- a/networking/traceroute.c +++ b/networking/traceroute.c @@ -215,13 +215,6 @@ #include "libbb.h" #include "inet_common.h" - -/* - * Definitions for internet protocol version 4. - * Per RFC 791, September 1981. - */ -#define IPVERSION 4 - #ifndef IPPROTO_ICMP # define IPPROTO_ICMP 1 #endif @@ -229,122 +222,57 @@ # 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 */ +/* Keep in sync with getopt32 call! */ +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 */ }; +#define verbose (option_mask32 & OPT_VERBOSE) -/* - * UDP kernel structures and variables. - */ -struct udpiphdr { - struct ipovly ui_i; /* overlaid ip structure */ - struct udphdr ui_u; /* udp header */ -}; -#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; +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) -#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; 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))) @@ -355,206 +283,39 @@ struct globals { #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_IFNAMSIZ(ifr.ifr_name, ifrp->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) -{ - 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); -} static int -wait_for_reply(int sock, struct sockaddr_in *fromp) +wait_for_reply(struct sockaddr_in *fromp) { struct pollfd pfd[1]; int cc = 0; socklen_t fromlen = sizeof(*fromp); - 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, + cc = recvfrom(rcvsock, recv_pkt, sizeof(recv_pkt), 0, (struct sockaddr *)fromp, &fromlen); return cc; } @@ -595,22 +356,8 @@ in_cksum(uint16_t *addr, int len) 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; @@ -618,39 +365,15 @@ send_probe(int seq, int 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) + if (option_mask32 & OPT_USE_ICMP) { 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; - } 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(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; } //BUG! verbose is (x & OPT_VERBOSE), not a counter! @@ -679,17 +402,25 @@ send_probe(int seq, int ttl) } #endif -#if !defined(IP_HDRINCL) && defined(IP_TTL) +#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 - cc = xsendto(sndsock, outip, packlen, - (struct sockaddr *)&whereto, sizeof(whereto)); - if (cc != packlen) { - bb_info_msg("sent %s %d octets, ret=%d", hostname, packlen, cc); + 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, + (struct sockaddr *)&dest_lsa->u.sa, dest_lsa->len); + if (res != len) { + bb_info_msg("sent %d octets, ret=%d", len, res); } } @@ -716,18 +447,18 @@ pr_type(unsigned char t) #endif #if !ENABLE_FEATURE_TRACEROUTE_VERBOSE -#define packet_ok(buf, cc, from, seq) \ - packet_ok(buf, cc, seq) +#define packet_ok(cc, from, seq) \ + packet_ok(cc, seq) #endif static int -packet_ok(const unsigned char *buf, int cc, const struct sockaddr_in *from, int seq) +packet_ok(int cc, const struct sockaddr_in *from, int seq) { const struct icmp *icp; unsigned char type, code; int hlen; const struct ip *ip; - ip = (struct ip *) buf; + ip = (struct ip *) recv_pkt; hlen = ip->ip_hl << 2; if (cc < hlen + ICMP_MINLEN) { #if ENABLE_FEATURE_TRACEROUTE_VERBOSE @@ -738,7 +469,7 @@ packet_ok(const unsigned char *buf, int cc, const struct sockaddr_in *from, int return 0; } cc -= hlen; - icp = (struct icmp *)(buf + hlen); + icp = (struct icmp *)(recv_pkt + hlen); type = icp->icmp_type; code = icp->icmp_code; /* Path MTU Discovery (RFC1191) */ @@ -755,33 +486,37 @@ packet_ok(const unsigned char *buf, int cc, const struct sockaddr_in *from, int 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)) + if (type == ICMP_ECHOREPLY + && icp->icmp_id == htons(ident) + && icp->icmp_seq == htons(seq) + ) { return -2; + } 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 <= cc + && 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 <= cc + && 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 @@ -812,85 +547,31 @@ print_inetname(const struct sockaddr_in *from) const char *ina; ina = inet_ntoa(from->sin_addr); - if (nflag) - printf(" %s", ina); + if (option_mask32 & OPT_ADDR_NUM) + printf(" %s", ina); else { char *n = NULL; if (from->sin_addr.s_addr != INADDR_ANY) n = xmalloc_sockaddr2host_noport((struct sockaddr*)from); - printf(" %s (%s)", (n ? n : ina), ina); + printf(" %s (%s)", (n ? n : ina), ina); free(n); } } static void -print(const unsigned char *buf, int cc, const struct sockaddr_in *from) +print(int cc, const struct sockaddr_in *from) { - const 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 -} + if (verbose) { + const struct ip *ip; + int hlen; -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; + ip = (struct ip *) recv_pkt; + hlen = ip->ip_hl << 2; + cc -= hlen; + printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst)); } - - 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); } -#endif static void print_delta_ms(unsigned t1p, unsigned t2p) @@ -900,46 +581,38 @@ print_delta_ms(unsigned t1p, unsigned t2p) } /* -"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]" +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) { - unsigned char *outp; - struct sockaddr_in *from; - struct sockaddr_in *to; - struct hostinfo *hi; - int ttl, probe, i; + int minpacket; + int ttl, i; int seq = 0; int tos = 0; - char *tos_str; - char *source; + int max_ttl = 30; + int nprobes = 3; + int first_ttl = 1; + unsigned pausemsecs = 0; unsigned op; -#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE - int lsrr = 0; -#endif - struct IFADDRLIST *al; + char *source; 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; #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE opt_complementary = "x-x:g::"; @@ -958,10 +631,10 @@ int traceroute_main(int argc, char **argv) #endif ); - 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) @@ -988,42 +661,33 @@ int traceroute_main(int argc, char **argv) #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 - 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 */ + 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; argc -= optind; switch (argc) { case 2: - packlen = xatoul_range(argv[1], minpacket, maxpacket); + packlen = xatoul_range(argv[1], minpacket, 32 * 1024); /* Fall through */ case 1: - hostname = argv[0]; - 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); + dest_lsa = xhost2sockaddr(argv[0], port); break; default: bb_show_usage(); @@ -1032,8 +696,7 @@ int traceroute_main(int argc, char **argv) /* Ensure the socket fds won't be 0, 1 or 2 */ bb_sanitize_stdio(); - rcvsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP); - + xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock); #if TRACEROUTE_SO_DEBUG if (op & OPT_DEBUG) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, @@ -1043,15 +706,17 @@ int traceroute_main(int argc, char **argv) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)); - sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW); - + 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] = to->sin_addr.s_addr; + gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr; ++lsrr; /* force 4 byte alignment */ @@ -1071,24 +736,20 @@ int traceroute_main(int argc, char **argv) } #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 ((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) @@ -1099,136 +760,82 @@ int traceroute_main(int argc, char **argv) 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 (op & OPT_TOS) - outip->ip_tos = tos; - outip->ip_len = htons(packlen); - if (op & OPT_DONT_FRAGMNT) - outip->ip_off = htons(IP_DF); - 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; + if (op & OPT_USE_ICMP) { + ident = getpid() | 0x8000; 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); + outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR); + } else { + outdata = (struct outdata_t *)(outudp + 1); } - /* Look for a specific device */ - if (op & OPT_DEVICE) { - /* Get the interface address list */ - int n = ifaddrlist(&al); - for (; n > 0; --n, ++al) - if (strcmp(device, al->device) == 0) - goto found_dev; - bb_error_msg_and_die("can't find interface %s", device); - } - found_dev: + if (op & OPT_DEVICE) /* hmm, do we need error check? */ + setsockopt_bindtodevice(sndsock, device); - /* 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) { - uint32_t *ap; - 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); - } 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)); - } - freehostinfo(hi); + if (op & OPT_SOURCE) { + 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"); +//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); } - outip->ip_src = from->sin_addr; -#ifndef IP_HDRINCL - xbind(sndsock, (struct sockaddr *)from, sizeof(*from)); -#endif + /* Revert to non-privileged user after opening sockets */ + xsetgid(getgid()); + xsetuid(getuid()); - printf("traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr)); + 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); 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 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; unsigned t1; unsigned t2; struct ip *ip; - if (sentfirst && pausemsecs > 0) + if (!first && pausemsecs > 0) usleep(pausemsecs * 1000); fflush(stdout); t1 = monotonic_us(); send_probe(++seq, ttl); - ++sentfirst; + first = 0; - while ((cc = wait_for_reply(rcvsock, from)) != 0) { + while ((cc = wait_for_reply(&from)) != 0) { t2 = monotonic_us(); - i = packet_ok(packet, cc, from, seq); + i = packet_ok(cc, &from, seq); /* Skip short packet */ if (i == 0) continue; if (!gotlastaddr - || from->sin_addr.s_addr != lastaddr + || from.sin_addr.s_addr != lastaddr ) { - print(packet, cc, from); - lastaddr = from->sin_addr.s_addr; - ++gotlastaddr; + print(cc, &from); + lastaddr = from.sin_addr.s_addr; + gotlastaddr = 1; } print_delta_ms(t1, t2); - ip = (struct ip *)packet; + ip = (struct ip *)recv_pkt; if (op & OPT_TTL_FLAG) printf(" (%d)", ip->ip_ttl); if (i == -2) { |