traceroute: code shrink
Move init code to a separate function. function old new delta traceroute_init - 1203 +1203 common_traceroute_main 3391 2141 -1250 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/1 up/down: 1203/-1250) Total: -47 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
70726640b3
commit
cc55bbef75
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@ -394,8 +394,12 @@ struct globals {
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int packlen; /* total length of packet */
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int pmtu; /* Path MTU Discovery (RFC1191) */
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uint32_t ident;
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uint16_t port; // 33434; /* start udp dest port # for probe packets */
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int waittime; // 5; /* time to wait for response (in seconds) */
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uint16_t port; /* start udp dest port # for probe packets */
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int waittime; /* time to wait for response (in seconds) */
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int first_ttl;
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int nprobes;
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unsigned pausemsecs;
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int max_ttl;
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unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
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};
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@ -412,8 +416,6 @@ struct globals {
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#define gwlist (G.gwlist )
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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port = 33434; \
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waittime = 5; \
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} while (0)
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#define outudp ((struct udphdr *)(outip + 1))
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@ -862,22 +864,16 @@ print_delta_ms(unsigned t1p, unsigned t2p)
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printf(" %u.%03u ms", tt / 1000, tt % 1000);
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}
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/*
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* Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]
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* [-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]
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* [-w waittime] [-z pausemsecs] host [packetlen]"
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/* Keeping init code in a separate (not inlined!) function
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* for stack use reduction and better register allocation in main loop.
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*/
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static int
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common_traceroute_main(int op, char **argv)
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static NOINLINE void
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traceroute_init(int op, char **argv)
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{
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int minpacket;
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#ifdef IP_TOS
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int tos = 0;
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#endif
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int max_ttl = 30;
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int nprobes = 3;
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int first_ttl = 1;
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unsigned pausemsecs = 0;
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char *source;
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char *device;
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char *tos_str;
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@ -893,14 +889,16 @@ common_traceroute_main(int op, char **argv)
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#else
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enum { af = AF_INET };
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#endif
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int ttl;
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int seq;
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struct sockaddr *lastaddr;
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/* Ensure the socket fds won't be 0, 1 or 2 */
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bb_sanitize_stdio();
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INIT_G();
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port = 33434;
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waittime = 5;
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G.first_ttl = 1;
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G.nprobes = 3;
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G.max_ttl = 30;
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op |= getopt32(argv, "^"
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OPT_STRING
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@ -919,17 +917,17 @@ common_traceroute_main(int op, char **argv)
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tos = xatou_range(tos_str, 0, 255);
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#endif
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if (op & OPT_MAX_TTL)
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max_ttl = xatou_range(max_ttl_str, 1, 255);
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G.max_ttl = xatou_range(max_ttl_str, 1, 255);
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if (op & OPT_PORT)
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port = xatou16(port_str);
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if (op & OPT_NPROBES)
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nprobes = xatou_range(nprobes_str, 1, INT_MAX);
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G.nprobes = xatou_range(nprobes_str, 1, INT_MAX);
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if (op & OPT_WAITTIME)
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waittime = xatou_range(waittime_str, 1, 24 * 60 * 60);
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if (op & OPT_PAUSE_MS)
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pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
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G.pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
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if (op & OPT_FIRST_TTL)
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first_ttl = xatou_range(first_ttl_str, 1, max_ttl);
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G.first_ttl = xatou_range(first_ttl_str, 1, G.max_ttl);
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/* Process destination and optional packet size */
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minpacket = sizeof(struct ip)
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@ -961,6 +959,9 @@ common_traceroute_main(int op, char **argv)
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#else
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dest_lsa = xhost2sockaddr(argv[0], port);
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#endif
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G.from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len);
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G.to = xzalloc(dest_lsa->len);
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packlen = minpacket;
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if (argv[1])
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packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
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@ -1102,20 +1103,28 @@ common_traceroute_main(int op, char **argv)
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if (op & OPT_SOURCE)
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printf(" from %s", source);
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printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
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printf(", %d hops max, %d byte packets\n", G.max_ttl, packlen);
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}
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static int
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common_traceroute_main(int op, char **argv)
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{
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int ttl;
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int seq;
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struct sockaddr *lastaddr;
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traceroute_init(op, argv);
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lastaddr = xzalloc(dest_lsa->len);
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G.from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len);
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G.to = xzalloc(dest_lsa->len);
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seq = 0;
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for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
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for (ttl = G.first_ttl; ttl <= G.max_ttl; ++ttl) {
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int probe;
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int unreachable = 0; /* counter */
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int gotlastaddr = 0; /* flags */
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int got_there = 0;
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printf("%2d", ttl);
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for (probe = 0; probe < nprobes; ++probe) {
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for (probe = 0; probe < G.nprobes; ++probe) {
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int read_len;
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unsigned t1;
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unsigned t2;
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@ -1123,14 +1132,15 @@ common_traceroute_main(int op, char **argv)
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fflush_all();
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if (probe != 0)
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msleep(pausemsecs);
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msleep(G.pausemsecs);
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send_probe(++seq, ttl);
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t2 = t1 = monotonic_us();
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left_ms = waittime * 1000;
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/* NB: wait_for_reply() fills "G.from_lsa" and "G.to"
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* with "where it came from" and "to which local address it arrived".
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/* NB: wait_for_reply() fills "G.from_lsa" and "G.to" with
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* "where it came from" and "what local address it arrived to"
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* addresses.
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*/
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while ((read_len = wait_for_reply(&t2, &left_ms)) != 0) {
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int icmp_code;
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@ -1255,7 +1265,7 @@ common_traceroute_main(int op, char **argv)
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bb_putchar('\n');
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if (got_there
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|| (unreachable > 0 && unreachable >= nprobes - 1)
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|| (unreachable > 0 && unreachable >= G.nprobes - 1)
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) {
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break;
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}
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