ref: 3bb180463108545274592b53940274c52b1d9186
dir: /sys/src/cmd/ip/ping.c/
/* ping for ip v4 and v6 */ #include <u.h> #include <libc.h> #include <ctype.h> #include <ip.h> #include <bio.h> #include <ndb.h> #include "icmp.h" enum { MAXMSG = 32, SLEEPMS = 1000, SECOND = 1000000000LL, MINUTE = 60*SECOND, }; typedef struct Req Req; struct Req { ushort seq; /* sequence number */ vlong time; /* time sent */ vlong rtt; int ttl; int replied; Req *next; }; typedef struct { int version; char *net; int echocmd; int echoreply; unsigned iphdrsz; void (*prreply)(Req *r, void *v); void (*prlost)(ushort seq, void *v); } Proto; Req *first; /* request list */ Req *last; /* ... */ Lock listlock; char *argv0; int addresses; int debug; int done; int flood; int lostmsgs; int lostonly; int quiet; int rcvdmsgs; int rint; ushort firstseq; vlong sum; int waittime = 5000; void lost(Req*, void*); void reply(Req*, void*); static void usage(void) { fprint(2, "usage: %s [-6alq] [-s msgsize] [-i millisecs] [-n #pings] dest\n", argv0); exits("usage"); } static void catch(void *a, char *msg) { USED(a); if(strstr(msg, "alarm")) noted(NCONT); else if(strstr(msg, "die")) exits("errors"); else noted(NDFLT); } static void prlost4(ushort seq, void *v) { Ip4hdr *ip4 = v; print("lost %ud: %V -> %V\n", seq, ip4->src, ip4->dst); } static void prlost6(ushort seq, void *v) { Ip6hdr *ip6 = v; print("lost %ud: %I -> %I\n", seq, ip6->src, ip6->dst); } static void prreply4(Req *r, void *v) { Ip4hdr *ip4 = v; print("%ud: %V -> %V rtt %lld µs, avg rtt %lld µs, ttl = %d\n", r->seq - firstseq, ip4->src, ip4->dst, r->rtt, sum/rcvdmsgs, r->ttl); } static void prreply6(Req *r, void *v) { Ip6hdr *ip6 = v; print("%ud: %I -> %I rtt %lld µs, avg rtt %lld µs, ttl = %d\n", r->seq - firstseq, ip6->src, ip6->dst, r->rtt, sum/rcvdmsgs, r->ttl); } static Proto v4pr = { 4, "icmp", EchoRequest, EchoReply, IPV4HDR_LEN, prreply4, prlost4, }; static Proto v6pr = { 6, "icmpv6", EchoRequestV6, EchoReplyV6, IPV6HDR_LEN, prreply6, prlost6, }; static Proto *proto = &v4pr; Icmphdr * geticmp(void *v) { char *p = v; return (Icmphdr *)(p + proto->iphdrsz); } void clean(ushort seq, vlong now, void *v) { int ttl; Req **l, *r; ttl = 0; if (v) { if (proto->version == 4) ttl = ((Ip4hdr *)v)->ttl; else ttl = ((Ip6hdr *)v)->ttl; } lock(&listlock); last = nil; for(l = &first; *l; ){ r = *l; if(v && r->seq == seq){ r->rtt = now-r->time; r->ttl = ttl; reply(r, v); } if(now-r->time > MINUTE){ *l = r->next; r->rtt = now-r->time; if(v) r->ttl = ttl; if(r->replied == 0) lost(r, v); free(r); }else{ last = r; l = &r->next; } } unlock(&listlock); } void sender(int fd, int msglen, int interval, int n) { int i, extra; ushort seq; char buf[64*1024+512]; Icmphdr *icmp; Req *r; srand(time(0)); firstseq = seq = rand(); icmp = geticmp(buf); memset(buf, 0, proto->iphdrsz + ICMP_HDRSIZE); for(i = proto->iphdrsz + ICMP_HDRSIZE; i < msglen; i++) buf[i] = i; icmp->type = proto->echocmd; icmp->code = 0; if(rint != 0 && interval <= 0) rint = 0; extra = 0; for(i = 0; i < n; i++){ if(i != 0){ if(rint != 0) extra = nrand(interval); sleep(interval + extra); } r = malloc(sizeof *r); if (r == nil) continue; hnputs(icmp->seq, seq); r->seq = seq; r->next = nil; r->replied = 0; r->time = nsec(); /* avoid early free in reply! */ lock(&listlock); if(first == nil) first = r; else last->next = r; last = r; unlock(&listlock); r->time = nsec(); if(write(fd, buf, msglen) < msglen){ fprint(2, "%s: write failed: %r\n", argv0); return; } seq++; } done = 1; } void rcvr(int fd, int msglen, int interval, int nmsg) { int i, n, munged; ushort x; vlong now; char err[ERRMAX]; uchar buf[64*1024+512]; Icmphdr *icmp; Req *r; sum = 0; while(lostmsgs+rcvdmsgs < nmsg){ alarm((nmsg-lostmsgs-rcvdmsgs)*interval+waittime); n = read(fd, buf, sizeof buf); alarm(0); if(n == 0) strcpy(err, "got eof"); else if(n < 0) rerrstr(err, sizeof(err)); now = nsec(); if(n <= 0){ print("%s\n", err); clean(0, now+MINUTE, nil); if(strstr(err, "interrupted") == nil) sleep(waittime); continue; } if(n < msglen){ print("bad len %d/%d\n", n, msglen); continue; } icmp = geticmp(buf); munged = 0; for(i = proto->iphdrsz + ICMP_HDRSIZE; i < msglen; i++) if(buf[i] != (uchar)i) munged++; if(munged) print("corrupted reply\n"); x = nhgets(icmp->seq); if(icmp->type != proto->echoreply || icmp->code != 0) { print("bad type/code/sequence %d/%d/%d (want %d/%d/%d)\n", icmp->type, icmp->code, x, proto->echoreply, 0, x); continue; } clean(x, now, buf); } lock(&listlock); for(r = first; r; r = r->next) if(r->replied == 0) lostmsgs++; unlock(&listlock); if(!quiet && lostmsgs) print("%d out of %d messages lost\n", lostmsgs, lostmsgs+rcvdmsgs); } enum { Maxstring = 128, Maxpath = 256, }; void main(int argc, char **argv) { int fd, msglen, interval, nmsg; nsec(); /* make sure time file is already open */ fmtinstall('V', eipfmt); fmtinstall('I', eipfmt); msglen = interval = 0; nmsg = MAXMSG; ARGBEGIN { case '6': proto = &v6pr; break; case 'a': addresses = 1; break; case 'd': debug++; break; case 'f': flood = 1; break; case 'i': interval = atoi(EARGF(usage())); if(interval < 0) usage(); break; case 'l': lostonly++; break; case 'n': nmsg = atoi(EARGF(usage())); if(nmsg < 0) usage(); break; case 'q': quiet = 1; break; case 'r': rint = 1; break; case 's': msglen = atoi(EARGF(usage())); break; case 'w': waittime = atoi(EARGF(usage())); if(waittime < 0) usage(); break; default: usage(); break; } ARGEND; if(msglen < proto->iphdrsz + ICMP_HDRSIZE) msglen = proto->iphdrsz + ICMP_HDRSIZE; if(msglen < 64) msglen = 64; if(msglen >= 64*1024) msglen = 64*1024-1; if(interval <= 0 && !flood) interval = SLEEPMS; if(argc < 1) usage(); notify(catch); if(strstr(argv[0], "icmpv6!") != nil) proto = &v6pr; again: fd = dial(netmkaddr(argv[0], proto->net, "1"), nil, nil, nil); if(fd < 0){ if(proto == &v4pr){ proto = &v6pr; goto again; } fprint(2, "%s: couldn't dial: %r\n", argv0); exits("dialing"); } if (!quiet){ NetConnInfo *nci = getnetconninfo(nil, fd); print("sending %d %d byte messages %d ms apart to %s\n", nmsg, msglen, interval, nci != nil? nci->raddr: argv[0]); } switch(rfork(RFPROC|RFMEM|RFFDG)){ case -1: fprint(2, "%s: can't fork: %r\n", argv0); exits("forking"); case 0: rcvr(fd, msglen, interval, nmsg); exits(0); default: sender(fd, msglen, interval, nmsg); wait(); exits(lostmsgs ? "lost messages" : ""); } } void reply(Req *r, void *v) { r->rtt /= 1000LL; sum += r->rtt; if(!r->replied) rcvdmsgs++; if(!quiet && !lostonly) if(addresses) (*proto->prreply)(r, v); else print("%ud: rtt %lld µs, avg rtt %lld µs, ttl = %d\n", r->seq - firstseq, r->rtt, sum/rcvdmsgs, r->ttl); r->replied = 1; } void lost(Req *r, void *v) { if(!quiet) if(addresses && v != nil) (*proto->prlost)(r->seq - firstseq, v); else print("lost %ud\n", r->seq - firstseq); lostmsgs++; }