/* vi: set sw=4 ts=4: */ /* * $Id: ping.c,v 1.56 2004/03/15 08:28:48 andersen Exp $ * Mini ping implementation for busybox * * Copyright (C) 1999 by Randolph Chung <tausq@debian.org> * * Adapted from the ping in netkit-base 0.10: * Copyright (c) 1989 The Regents of the University of California. * Derived from software contributed to Berkeley by Mike Muuss. * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include <sys/param.h> #include <sys/socket.h> #include <sys/file.h> #include <sys/times.h> #include <signal.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip_icmp.h> #include <arpa/inet.h> #include <netdb.h> #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <unistd.h> #include <string.h> #include <stdlib.h> #include "busybox.h" enum { DEFDATALEN = 56, MAXIPLEN = 60, MAXICMPLEN = 76, MAXPACKET = 65468, MAX_DUP_CHK = (8 * 128), MAXWAIT = 10, PINGINTERVAL = 1 /* second */ }; #define O_QUIET (1 << 0) #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */ #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */ #define SET(bit) (A(bit) |= B(bit)) #define CLR(bit) (A(bit) &= (~B(bit))) #define TST(bit) (A(bit) & B(bit)) static void ping(const char *host); /* common routines */ static int in_cksum(unsigned short *buf, int sz) { int nleft = sz; int sum = 0; unsigned short *w = buf; unsigned short ans = 0; while (nleft > 1) { sum += *w++; nleft -= 2; } if (nleft == 1) { *(unsigned char *) (&ans) = *(unsigned char *) w; sum += ans; } sum = (sum >> 16) + (sum & 0xFFFF); sum += (sum >> 16); ans = ~sum; return (ans); } /* simple version */ #ifndef CONFIG_FEATURE_FANCY_PING static char *hostname; static void noresp(int ign) { printf("No response from %s\n", hostname); exit(EXIT_FAILURE); } static void ping(const char *host) { struct hostent *h; struct sockaddr_in pingaddr; struct icmp *pkt; int pingsock, c; char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN]; pingsock = create_icmp_socket(); memset(&pingaddr, 0, sizeof(struct sockaddr_in)); pingaddr.sin_family = AF_INET; h = xgethostbyname(host); memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr)); hostname = h->h_name; pkt = (struct icmp *) packet; memset(pkt, 0, sizeof(packet)); pkt->icmp_type = ICMP_ECHO; pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet)); c = sendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN, 0, (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in)); if (c < 0) { if (ENABLE_FEATURE_CLEAN_UP) close(pingsock); bb_perror_msg_and_die("sendto"); } signal(SIGALRM, noresp); alarm(5); /* give the host 5000ms to respond */ /* listen for replies */ while (1) { struct sockaddr_in from; socklen_t fromlen = sizeof(from); if ((c = recvfrom(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &from, &fromlen)) < 0) { if (errno == EINTR) continue; bb_perror_msg("recvfrom"); continue; } if (c >= 76) { /* ip + icmp */ struct iphdr *iphdr = (struct iphdr *) packet; pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */ if (pkt->icmp_type == ICMP_ECHOREPLY) break; } } if (ENABLE_FEATURE_CLEAN_UP) close(pingsock); printf("%s is alive!\n", hostname); return; } int ping_main(int argc, char **argv) { argc--; argv++; if (argc < 1) bb_show_usage(); ping(*argv); return EXIT_SUCCESS; } #else /* ! CONFIG_FEATURE_FANCY_PING */ /* full(er) version */ static struct sockaddr_in pingaddr; static struct sockaddr_in sourceaddr; static int pingsock = -1; static unsigned datalen; /* intentionally uninitialized to work around gcc bug */ static unsigned long ntransmitted, nreceived, nrepeats, pingcount; static int myid, options; static unsigned long tmin = ULONG_MAX, tmax, tsum; static char rcvd_tbl[MAX_DUP_CHK / 8]; static struct hostent *hostent; static void sendping(int); static void pingstats(int); static void unpack(char *, int, struct sockaddr_in *); /**************************************************************************/ static void pingstats(int junk) { int status; signal(SIGINT, SIG_IGN); printf("\n--- %s ping statistics ---\n", hostent->h_name); printf("%lu packets transmitted, ", ntransmitted); printf("%lu packets received, ", nreceived); if (nrepeats) printf("%lu duplicates, ", nrepeats); if (ntransmitted) printf("%lu%% packet loss\n", (ntransmitted - nreceived) * 100 / ntransmitted); if (nreceived) printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n", tmin / 10, tmin % 10, (tsum / (nreceived + nrepeats)) / 10, (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10); if (nreceived != 0) status = EXIT_SUCCESS; else status = EXIT_FAILURE; exit(status); } static void sendping(int junk) { struct icmp *pkt; int i; char packet[datalen + ICMP_MINLEN]; pkt = (struct icmp *) packet; pkt->icmp_type = ICMP_ECHO; pkt->icmp_code = 0; pkt->icmp_cksum = 0; pkt->icmp_seq = htons(ntransmitted++); pkt->icmp_id = myid; CLR(ntohs(pkt->icmp_seq) % MAX_DUP_CHK); gettimeofday((struct timeval *) &pkt->icmp_dun, NULL); pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet)); i = sendto(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in)); if (i < 0) bb_perror_msg_and_die("sendto"); else if ((size_t)i != sizeof(packet)) bb_error_msg_and_die("ping wrote %d chars; %d expected", i, (int)sizeof(packet)); signal(SIGALRM, sendping); if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */ alarm(PINGINTERVAL); } else { /* done, wait for the last ping to come back */ /* todo, don't necessarily need to wait so long... */ signal(SIGALRM, pingstats); alarm(MAXWAIT); } } static char *icmp_type_name(int id) { switch (id) { case ICMP_ECHOREPLY: return "Echo Reply"; case ICMP_DEST_UNREACH: return "Destination Unreachable"; case ICMP_SOURCE_QUENCH: return "Source Quench"; case ICMP_REDIRECT: return "Redirect (change route)"; case ICMP_ECHO: return "Echo Request"; case ICMP_TIME_EXCEEDED: return "Time Exceeded"; case ICMP_PARAMETERPROB: return "Parameter Problem"; case ICMP_TIMESTAMP: return "Timestamp Request"; case ICMP_TIMESTAMPREPLY: return "Timestamp Reply"; case ICMP_INFO_REQUEST: return "Information Request"; case ICMP_INFO_REPLY: return "Information Reply"; case ICMP_ADDRESS: return "Address Mask Request"; case ICMP_ADDRESSREPLY: return "Address Mask Reply"; default: return "unknown ICMP type"; } } static void unpack(char *buf, int sz, struct sockaddr_in *from) { struct icmp *icmppkt; struct iphdr *iphdr; struct timeval tv, *tp; int hlen, dupflag; unsigned long triptime; gettimeofday(&tv, NULL); /* discard if too short */ if (sz < (datalen + ICMP_MINLEN)) return; /* check IP header */ iphdr = (struct iphdr *) buf; hlen = iphdr->ihl << 2; sz -= hlen; icmppkt = (struct icmp *) (buf + hlen); if (icmppkt->icmp_id != myid) return; /* not our ping */ if (icmppkt->icmp_type == ICMP_ECHOREPLY) { u_int16_t recv_seq = ntohs(icmppkt->icmp_seq); ++nreceived; tp = (struct timeval *) icmppkt->icmp_data; if ((tv.tv_usec -= tp->tv_usec) < 0) { --tv.tv_sec; tv.tv_usec += 1000000; } tv.tv_sec -= tp->tv_sec; triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100); tsum += triptime; if (triptime < tmin) tmin = triptime; if (triptime > tmax) tmax = triptime; if (TST(recv_seq % MAX_DUP_CHK)) { ++nrepeats; --nreceived; dupflag = 1; } else { SET(recv_seq % MAX_DUP_CHK); dupflag = 0; } if (options & O_QUIET) return; printf("%d bytes from %s: icmp_seq=%u", sz, inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr), recv_seq); printf(" ttl=%d", iphdr->ttl); printf(" time=%lu.%lu ms", triptime / 10, triptime % 10); if (dupflag) printf(" (DUP!)"); printf("\n"); } else if (icmppkt->icmp_type != ICMP_ECHO) bb_error_msg("Warning: Got ICMP %d (%s)", icmppkt->icmp_type, icmp_type_name(icmppkt->icmp_type)); fflush(stdout); } static void ping(const char *host) { char packet[datalen + MAXIPLEN + MAXICMPLEN]; int sockopt; pingsock = create_icmp_socket(); if (sourceaddr.sin_addr.s_addr) { xbind(pingsock, (struct sockaddr*)&sourceaddr, sizeof(sourceaddr)); } memset(&pingaddr, 0, sizeof(struct sockaddr_in)); pingaddr.sin_family = AF_INET; hostent = xgethostbyname(host); if (hostent->h_addrtype != AF_INET) bb_error_msg_and_die("unknown address type; only AF_INET is currently supported"); memcpy(&pingaddr.sin_addr, hostent->h_addr, sizeof(pingaddr.sin_addr)); /* enable broadcast pings */ sockopt = 1; setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt, sizeof(sockopt)); /* set recv buf for broadcast pings */ sockopt = 48 * 1024; setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt, sizeof(sockopt)); printf("PING %s (%s)", hostent->h_name, inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr)); if (sourceaddr.sin_addr.s_addr) { printf(" from %s", inet_ntoa(*(struct in_addr *) &sourceaddr.sin_addr.s_addr)); } printf(": %d data bytes\n", datalen); signal(SIGINT, pingstats); /* start the ping's going ... */ sendping(0); /* listen for replies */ while (1) { struct sockaddr_in from; socklen_t fromlen = (socklen_t) sizeof(from); int c; if ((c = recvfrom(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &from, &fromlen)) < 0) { if (errno == EINTR) continue; bb_perror_msg("recvfrom"); continue; } unpack(packet, c, &from); if (pingcount > 0 && nreceived >= pingcount) break; } pingstats(0); } /* TODO: consolidate ether-wake.c, dnsd.c, ifupdown.c, nslookup.c * versions of below thing. BTW we have far too many "%u.%u.%u.%u" too... */ static int parse_nipquad(const char *str, struct sockaddr_in* addr) { char dummy; unsigned i1, i2, i3, i4; if (sscanf(str, "%u.%u.%u.%u%c", &i1, &i2, &i3, &i4, &dummy) == 4 && ( (i1|i2|i3|i4) <= 0xff ) ) { uint8_t* ptr = (uint8_t*)&addr->sin_addr; ptr[0] = i1; ptr[1] = i2; ptr[2] = i3; ptr[3] = i4; return 0; } return 1; /* error */ } int ping_main(int argc, char **argv) { char *thisarg; datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */ argc--; argv++; /* Parse any options */ while (argc >= 1 && **argv == '-') { thisarg = *argv; thisarg++; switch (*thisarg) { case 'q': options |= O_QUIET; break; case 'c': if (--argc <= 0) bb_show_usage(); argv++; pingcount = xatoul(*argv); break; case 's': if (--argc <= 0) bb_show_usage(); argv++; datalen = xatou16(*argv); break; case 'I': if (--argc <= 0) bb_show_usage(); argv++; /* ping6 accepts iface too: if_index = if_nametoindex(*argv); if (!if_index) ... make it true for ping too. TODO. */ if (parse_nipquad(*argv, &sourceaddr)) bb_show_usage(); break; default: bb_show_usage(); } argc--; argv++; } if (argc < 1) bb_show_usage(); myid = (int16_t) getpid(); ping(*argv); return EXIT_SUCCESS; } #endif /* ! CONFIG_FEATURE_FANCY_PING */