diff options
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/traceroute.c | 61 |
1 files changed, 37 insertions, 24 deletions
diff --git a/networking/traceroute.c b/networking/traceroute.c index 96f9d34..85181ab 100644 --- a/networking/traceroute.c +++ b/networking/traceroute.c @@ -398,18 +398,23 @@ static len_and_sockaddr* dup_sockaddr(const len_and_sockaddr *lsa) static int -wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to) +wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to, unsigned *timestamp_us, int *left_ms) { struct pollfd pfd[1]; int read_len = 0; pfd[0].fd = rcvsock; pfd[0].events = POLLIN; - if (safe_poll(pfd, 1, waittime * 1000) > 0) { + 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:*/ 0, + /*flags:*/ MSG_DONTWAIT, &from_lsa->u.sa, to, from_lsa->len); + t = monotonic_us(); + *left_ms -= (t - *timestamp_us) / 1000; + *timestamp_us = t; } return read_len; @@ -730,7 +735,7 @@ packet_ok(int read_len, len_and_sockaddr *from_lsa, type, pr_type(type), icp->icmp6_code); read_len -= sizeof(struct icmp6_hdr); - for (i = 0; i < read_len ; i++) { + for (i = 0; i < read_len; i++) { if (i % 16 == 0) printf("%04x:", i); if (i % 4 == 0) @@ -819,7 +824,6 @@ print_delta_ms(unsigned t1p, unsigned t2p) static int common_traceroute_main(int op, char **argv) { - int i; int minpacket; int tos = 0; int max_ttl = 30; @@ -973,6 +977,7 @@ common_traceroute_main(int op, char **argv) #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE && defined IP_OPTIONS if (lsrr > 0) { unsigned char optlist[MAX_IPOPTLEN]; + unsigned size; /* final hop */ gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr; @@ -982,14 +987,14 @@ common_traceroute_main(int op, char **argv) optlist[0] = IPOPT_NOP; /* loose source route option */ optlist[1] = IPOPT_LSRR; - i = lsrr * sizeof(gwlist[0]); - optlist[2] = i + 3; + size = lsrr * sizeof(gwlist[0]); + optlist[2] = size + 3; /* pointer to LSRR addresses */ optlist[3] = IPOPT_MINOFF; - memcpy(optlist + 4, gwlist, i); + memcpy(optlist + 4, gwlist, size); if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS, - (char *)optlist, i + sizeof(gwlist[0])) < 0) { + (char *)optlist, size + sizeof(gwlist[0])) < 0) { bb_perror_msg_and_die("IP_OPTIONS"); } } @@ -1103,28 +1108,34 @@ common_traceroute_main(int op, char **argv) 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 read_len; unsigned t1; unsigned t2; + int left_ms; struct ip *ip; - if (!first && pausemsecs > 0) - usleep(pausemsecs * 1000); fflush_all(); + if (probe != 0 && pausemsecs > 0) + usleep(pausemsecs * 1000); - t1 = monotonic_us(); send_probe(++seq, ttl); + t2 = t1 = monotonic_us(); + + 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 */ - first = 0; - while ((read_len = wait_for_reply(from_lsa, to)) != 0) { - t2 = monotonic_us(); - i = packet_ok(read_len, from_lsa, to, seq); + 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 @@ -1143,10 +1154,10 @@ common_traceroute_main(int op, char **argv) 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; @@ -1219,16 +1230,18 @@ common_traceroute_main(int op, char **argv) ++unreachable; break; default: - printf(" !<%d>", i); + printf(" !<%d>", icmp_code); ++unreachable; break; } break; - } + } /* 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) |