diff options
| -rw-r--r-- | networking/traceroute.c | 105 |
1 files changed, 41 insertions, 64 deletions
diff --git a/networking/traceroute.c b/networking/traceroute.c index e6afdd8..cf2b3cc 100644 --- a/networking/traceroute.c +++ b/networking/traceroute.c @@ -413,7 +413,6 @@ struct globals { #define port (G.port ) #define waittime (G.waittime ) #define recv_pkt (G.recv_pkt ) -#define gwlist (G.gwlist ) #define INIT_G() do { \ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ } while (0) @@ -683,12 +682,15 @@ packet4_ok(int read_len, int seq) int i; uint32_t *lp = (uint32_t *)&icp->icmp_ip; - printf("\n%d bytes from %s", - read_len, inet_ntoa(G.from_lsa->u.sin.sin_addr)); - /* Two separate printf() because inet_ntoa() returns static string */ - printf(" to %s: icmp type %d (%s) code %d\n", + printf("\n%d bytes from %s to %s: icmp type %d (%s) code %d\n", + read_len, + /* inet_ntoa(G.from_lsa->u.sin.sin_addr) - two calls of inet_ntoa() + * are unsafe (use the same buffer), using this instead: + */ + auto_string(xmalloc_sockaddr2dotted_noport(&G.from_lsa->u.sa)), inet_ntoa(ip->ip_dst), - type, pr_type(type), icp->icmp_code); + type, pr_type(type), icp->icmp_code + ); for (i = 4; i < read_len; i += sizeof(*lp)) printf("%2d: x%8.8x\n", i, *lp++); } @@ -756,19 +758,16 @@ packet6_ok(int read_len, int seq) # if ENABLE_FEATURE_TRACEROUTE_VERBOSE if (verbose) { unsigned char *p; - char pa[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff") + 4]; int i; p = (unsigned char *) (icp + 1); - printf("\n%d bytes from %s", + printf("\n%d bytes from %s to %s: icmp type %d (%s) code %d\n", read_len, - inet_ntop(AF_INET6, &G.from_lsa->u.sin6.sin6_addr, pa, sizeof(pa))); - /* Two printf() instead of one - reuse string constants */ - printf(" to %s: icmp type %d (%s) code %d\n", - inet_ntop(AF_INET6, &((struct sockaddr_in6*)G.to)->sin6_addr, pa, sizeof(pa)), - type, pr_type(type), icp->icmp6_code); - + auto_string(xmalloc_sockaddr2dotted_noport(&G.from_lsa->u.sa)), + auto_string(xmalloc_sockaddr2dotted_noport(G.to)), + type, pr_type(type), icp->icmp6_code + ); read_len -= sizeof(struct icmp6_hdr); for (i = 0; i < read_len; i++) { if (i % 16 == 0) @@ -796,55 +795,36 @@ packet_ok(int read_len, int seq) #else /* !ENABLE_TRACEROUTE6 */ -static ALWAYS_INLINE int -packet_ok(int read_len, int seq) -{ - return packet4_ok(read_len, seq); -} +# define packet_ok(read_len, seq) packet4_ok(read_len, 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 *from) +print(int read_len) { - char *ina = xmalloc_sockaddr2dotted_noport(from); + char *ina = auto_string(xmalloc_sockaddr2dotted_noport(&G.from_lsa->u.sa)); if (option_mask32 & OPT_ADDR_NUM) { printf(" %s", ina); } else { char *n = NULL; - - if (from->sa_family != AF_INET - || ((struct sockaddr_in*)from)->sin_addr.s_addr != INADDR_ANY + if (G.from_lsa->u.sa.sa_family != AF_INET + || G.from_lsa->u.sin.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); + n = auto_string(xmalloc_sockaddr2host_noport(&G.from_lsa->u.sa)); } printf(" %s (%s)", (n ? n : ina), ina); - free(n); } - free(ina); -} - -static void -print(int read_len) -{ - print_inetname(&G.from_lsa->u.sa); if (verbose) { - char *ina = xmalloc_sockaddr2dotted_noport(G.to); #if ENABLE_TRACEROUTE6 /* NB: reads from (AF_INET, SOCK_RAW, IPPROTO_ICMP) socket * return the entire IP packet (IOW: they do not strip IP header). * Reads from (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6) do strip IPv6 * header and return only ICMP6 packet. Weird. */ - if (G.to->sa_family == AF_INET6) { + if (G.from_lsa->u.sa.sa_family == AF_INET6) { /* read_len -= sizeof(struct ip6_hdr); - WRONG! */ } else #endif @@ -852,8 +832,9 @@ print(int read_len) struct ip *ip4packet = (struct ip*)recv_pkt; read_len -= ip4packet->ip_hl << 2; } - printf(" %d bytes to %s", read_len, ina); - free(ina); + printf(" %d bytes to %s", read_len, + auto_string(xmalloc_sockaddr2dotted_noport(G.to)) + ); } } @@ -870,10 +851,6 @@ print_delta_ms(unsigned t1p, unsigned t2p) static NOINLINE void traceroute_init(int op, char **argv) { - int minpacket; -#ifdef IP_TOS - int tos = 0; -#endif char *source; char *device; char *tos_str; @@ -912,10 +889,6 @@ traceroute_init(int op, char **argv) 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) G.max_ttl = xatou_range(max_ttl_str, 1, 255); if (op & OPT_PORT) @@ -930,11 +903,11 @@ traceroute_init(int op, char **argv) G.first_ttl = xatou_range(first_ttl_str, 1, G.max_ttl); /* Process destination and optional packet size */ - minpacket = sizeof(struct ip) + packlen = sizeof(struct ip) + sizeof(struct udphdr) + sizeof(struct outdata_t); if (op & OPT_USE_ICMP) { - minpacket = sizeof(struct ip) + packlen = sizeof(struct ip) + SIZEOF_ICMP_HDR + sizeof(struct outdata_t); port = 0; /* on ICMP6 sockets, sendto(ipv6.nonzero_port) throws EINVAL */ @@ -948,11 +921,11 @@ traceroute_init(int op, char **argv) 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) + packlen = sizeof(struct ip6_hdr) + sizeof(struct udphdr) + sizeof(struct outdata6_t); if (op & OPT_USE_ICMP) - minpacket = sizeof(struct ip6_hdr) + packlen = sizeof(struct ip6_hdr) + SIZEOF_ICMP_HDR + sizeof(struct outdata6_t); } @@ -961,19 +934,20 @@ traceroute_init(int op, char **argv) #endif G.from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len); G.to = xzalloc(dest_lsa->len); - - packlen = minpacket; if (argv[1]) - packlen = xatoul_range(argv[1], minpacket, 32 * 1024); + packlen = xatoul_range(argv[1], packlen, 32 * 1024); #if ENABLE_TRACEROUTE6 if (af == AF_INET6) { xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock); - setsockopt_1(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO); //why? + /* want recvmsg to report target local address (for -v) */ + setsockopt_1(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO); } else #endif { xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock); + /* want recvmsg to report target local address (for -v) */ + setsockopt_1(rcvsock, IPPROTO_IP, IP_PKTINFO); } #if TRACEROUTE_SO_DEBUG @@ -1010,8 +984,10 @@ traceroute_init(int op, char **argv) } #endif #ifdef IP_TOS - if ((op & OPT_TOS) && setsockopt_int(sndsock, IPPROTO_IP, IP_TOS, tos) != 0) { - bb_perror_msg_and_die("setsockopt(%s) %d", "TOS", tos); + if (op & OPT_TOS) { + int tos = xatou_range(tos_str, 0, 255); + if (setsockopt_int(sndsock, IPPROTO_IP, IP_TOS, tos) != 0) + bb_perror_msg_and_die("setsockopt(%s,%d)", "TOS", tos); } #endif #ifdef IP_DONTFRAG @@ -1070,7 +1046,8 @@ traceroute_init(int op, char **argv) //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_FEATURE_CLEAN_UP) + free(source_lsa); } #if ENABLE_TRACEROUTE6 else if (af == AF_INET6) { @@ -1087,7 +1064,8 @@ traceroute_init(int op, char **argv) /* bind our recv socket to this IP (but not port) */ set_nport(&source_lsa->u.sa, 0); xbind(rcvsock, &source_lsa->u.sa, source_lsa->len); - free(source_lsa); + if (ENABLE_FEATURE_CLEAN_UP) + free(source_lsa); } #endif @@ -1097,9 +1075,8 @@ traceroute_init(int op, char **argv) dest_str = xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa); printf("traceroute to %s (%s)", argv[0], dest_str); - if (ENABLE_FEATURE_CLEAN_UP) { + if (ENABLE_FEATURE_CLEAN_UP) free(dest_str); - } if (op & OPT_SOURCE) printf(" from %s", source); |