diff options
author | Denis Vlasenko <vda.linux@googlemail.com> | 2009-01-24 23:11:36 +0300 |
---|---|---|
committer | Denis Vlasenko <vda.linux@googlemail.com> | 2009-01-24 23:11:36 +0300 |
commit | fa65a3d78f32a305239494b8dc0f8ef14f83465d (patch) | |
tree | c9a569eb94741eda1324055150032bb40a2ae449 /networking/traceroute.c | |
parent | 39b681343bee81fb7c31fd06e4dc5343bcef1292 (diff) |
traceroute: preparatory trivial cleanups
function old new delta
traceroute_main 3932 3713 -219
Diffstat (limited to 'networking/traceroute.c')
-rw-r--r-- | networking/traceroute.c | 218 |
1 files changed, 94 insertions, 124 deletions
diff --git a/networking/traceroute.c b/networking/traceroute.c index 5d1baacf5..958299aaa 100644 --- a/networking/traceroute.c +++ b/networking/traceroute.c @@ -223,11 +223,10 @@ #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 /* @@ -482,7 +481,6 @@ ifaddrlist(struct IFADDRLIST **ipaddrp) return nipaddr; } - static void setsin(struct sockaddr_in *addr_sin, uint32_t addr) { @@ -494,7 +492,6 @@ setsin(struct sockaddr_in *addr_sin, uint32_t addr) addr_sin->sin_addr.s_addr = addr; } - /* * Return the source address for the given destination address */ @@ -547,13 +544,6 @@ findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from) setsin(from, al->addr); } -/* -"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) { @@ -581,12 +571,12 @@ in_cksum(uint16_t *addr, int len) 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; } @@ -595,16 +585,13 @@ in_cksum(uint16_t *addr, int len) 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) { @@ -617,12 +604,10 @@ send_probe(int seq, int ttl) /* * In most cases, the kernel will recalculate the ip checksum. - * But we must do it anyway so that the udp checksum comes out - * right. + * 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); + outip->ip_sum = in_cksum((uint16_t *)outip, sizeof(*outip) + optlen); if (outip->ip_sum == 0) outip->ip_sum = 0xffff; } @@ -645,7 +630,7 @@ send_probe(int seq, int ttl) /* Always calculate checksum for icmp packets */ outicmp->icmp_cksum = 0; outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp, - packlen - (sizeof(*outip) + optlen)); + packlen - (sizeof(*outip) + optlen)); if (outicmp->icmp_cksum == 0) outicmp->icmp_cksum = 0xffff; } else @@ -656,7 +641,7 @@ send_probe(int seq, int ttl) 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)); + 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; @@ -668,7 +653,8 @@ send_probe(int seq, int ttl) *outip = tip; } -#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; @@ -695,15 +681,15 @@ send_probe(int seq, int ttl) #if !defined(IP_HDRINCL) && defined(IP_TTL) if (setsockopt(sndsock, IPPROTO_IP, IP_TTL, - (char *)&ttl, sizeof(ttl)) < 0) { + (char *)&ttl, sizeof(ttl)) < 0) { bb_perror_msg_and_die("setsockopt ttl %d", ttl); } #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); + 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); } } @@ -722,7 +708,7 @@ pr_type(unsigned char t) "Info Reply", "Mask Request", "Mask Reply" }; - if (t > 18) + if (t >= ARRAY_SIZE(ttab)) return "OUT-OF-RANGE"; return ttab[t]; @@ -734,12 +720,12 @@ pr_type(unsigned char t) packet_ok(buf, cc, seq) #endif static int -packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq) +packet_ok(const unsigned char *buf, int cc, 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; hlen = ip->ip_hl << 2; @@ -756,15 +742,16 @@ packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq) 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; @@ -804,8 +791,9 @@ packet_ok(unsigned char *buf, int cc, 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), - inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code); + 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)) printf("%2d: x%8.8x\n", i, *lp++); } @@ -813,14 +801,13 @@ packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq) return 0; } - /* * 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_in *from) { const char *ina; @@ -837,9 +824,9 @@ print_inetname(struct sockaddr_in *from) } static void -print(unsigned char *buf, int cc, struct sockaddr_in *from) +print(const unsigned char *buf, int cc, const struct sockaddr_in *from) { - struct ip *ip; + const struct ip *ip; int hlen; ip = (struct ip *) buf; @@ -853,7 +840,6 @@ print(unsigned char *buf, int cc, struct sockaddr_in *from) #endif } - static struct hostinfo * gethostinfo(const char *host) { @@ -910,15 +896,19 @@ 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); } +/* +"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]" +*/ + int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int traceroute_main(int argc, char **argv) { - int code, n; unsigned char *outp; - uint32_t *ap; struct sockaddr_in *from; struct sockaddr_in *to; struct hostinfo *hi; @@ -931,7 +921,6 @@ int traceroute_main(int argc, char **argv) #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE int lsrr = 0; #endif - uint16_t off = 0; struct IFADDRLIST *al; char *device; int max_ttl = 30; @@ -952,7 +941,6 @@ int traceroute_main(int argc, char **argv) from = (struct sockaddr_in *)&wherefrom; to = (struct sockaddr_in *)&whereto; - //opterr = 0; #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE opt_complementary = "x-x:g::"; #else @@ -970,8 +958,6 @@ int traceroute_main(int argc, char **argv) #endif ); - if (op & OPT_DONT_FRAGMNT) - off = IP_DF; if (op & OPT_IP_CHKSUM) { doipcksum = 0; bb_error_msg("warning: ip checksums disabled"); @@ -989,15 +975,15 @@ int traceroute_main(int argc, char **argv) * 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("you must be root to use -s"); } if (op & OPT_WAITTIME) waittime = xatou_range(waittime_str, 2, 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) { @@ -1011,12 +997,6 @@ int traceroute_main(int argc, char **argv) } #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 @@ -1028,14 +1008,14 @@ int traceroute_main(int argc, char **argv) packlen = minpacket; /* minimum sized packet */ /* Process destination and optional packet size */ - switch (argc - optind) { - + argv += optind; + argc -= optind; + switch (argc) { case 2: - packlen = xatoul_range(argv[optind + 1], minpacket, maxpacket); + packlen = xatoul_range(argv[1], minpacket, maxpacket); /* Fall through */ - case 1: - hostname = argv[optind]; + hostname = argv[0]; hi = gethostinfo(hostname); setsin(to, hi->addrs[0]); if (hi->n > 1) @@ -1045,7 +1025,6 @@ int traceroute_main(int argc, char **argv) hi->name = NULL; freehostinfo(hi); break; - default: bb_show_usage(); } @@ -1081,12 +1060,12 @@ int traceroute_main(int argc, char **argv) optlist[1] = IPOPT_LSRR; i = lsrr * sizeof(gwlist[0]); optlist[2] = i + 3; - /* Pointer to LSRR addresses */ + /* 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) { + if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS, + (char *)optlist, i + sizeof(gwlist[0])) < 0) { bb_perror_msg_and_die("IP_OPTIONS"); } } @@ -1106,7 +1085,7 @@ int traceroute_main(int argc, char **argv) } #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 @@ -1127,10 +1106,11 @@ int traceroute_main(int argc, char **argv) outip = xzalloc(packlen); outip->ip_v = IPVERSION; - if (tos_str) + if (op & OPT_TOS) outip->ip_tos = tos; outip->ip_len = htons(packlen); - outip->ip_off = htons(off); + if (op & OPT_DONT_FRAGMNT) + outip->ip_off = htons(IP_DF); outp = (unsigned char *)(outip + 1); outip->ip_dst = to->sin_addr; @@ -1153,12 +1133,11 @@ int traceroute_main(int argc, char **argv) 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) + /* 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); @@ -1185,6 +1164,7 @@ int traceroute_main(int argc, char **argv) * 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; @@ -1197,7 +1177,7 @@ int traceroute_main(int argc, char **argv) if (hi->n > 1) bb_error_msg( "warning: %s has multiple addresses; using %s", - source, inet_ntoa(from->sin_addr)); + source, inet_ntoa(from->sin_addr)); } freehostinfo(hi); } @@ -1211,7 +1191,6 @@ int traceroute_main(int argc, char **argv) if (op & OPT_SOURCE) printf(" from %s", source); printf(", %d hops max, %d byte packets\n", max_ttl, packlen); - fflush(stdout); for (ttl = first_ttl; ttl <= max_ttl; ++ttl) { uint32_t lastaddr = 0; @@ -1229,17 +1208,21 @@ int traceroute_main(int argc, char **argv) if (sentfirst && pausemsecs > 0) usleep(pausemsecs * 1000); + fflush(stdout); + t1 = monotonic_us(); send_probe(++seq, ttl); ++sentfirst; + while ((cc = wait_for_reply(rcvsock, from)) != 0) { t2 = monotonic_us(); i = packet_ok(packet, cc, from, seq); /* Skip short packet */ if (i == 0) continue; - if (!gotlastaddr || - from->sin_addr.s_addr != lastaddr) { + if (!gotlastaddr + || from->sin_addr.s_addr != lastaddr + ) { print(packet, cc, from); lastaddr = from->sin_addr.s_addr; ++gotlastaddr; @@ -1251,99 +1234,86 @@ int traceroute_main(int argc, char **argv) if (i == -2) { if (ip->ip_ttl <= 1) printf(" !"); - ++got_there; + got_there = 1; break; } /* time exceeded in transit */ if (i == -1) break; - code = i - 1; - switch (code) { - + i--; + switch (i) { case ICMP_UNREACH_PORT: if (ip->ip_ttl <= 1) printf(" !"); - ++got_there; + got_there = 1; break; - case ICMP_UNREACH_NET: - ++unreachable; printf(" !N"); + ++unreachable; break; - case ICMP_UNREACH_HOST: - ++unreachable; 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; 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); + printf(" *"); } bb_putchar('\n'); - if (got_there || - (unreachable > 0 && unreachable >= nprobes - 1)) + if (got_there + || (unreachable > 0 && unreachable >= nprobes - 1) + ) { break; + } } return 0; } |