| /* 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 = NULL; |
| 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 int pingsock = -1; |
| static int datalen; /* intentionally uninitialized to work around gcc bug */ |
| |
| static 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]; |
| |
| #ifndef CONFIG_FEATURE_FANCY_PING6 |
| static |
| #endif |
| 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("%ld packets transmitted, ", ntransmitted); |
| printf("%ld packets received, ", nreceived); |
| if (nrepeats) |
| printf("%ld duplicates, ", nrepeats); |
| if (ntransmitted) |
| printf("%ld%% 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); |
| |
| /* check IP header */ |
| iphdr = (struct iphdr *) buf; |
| hlen = iphdr->ihl << 2; |
| /* discard if too short */ |
| if (sz < (datalen + ICMP_MINLEN)) |
| return; |
| |
| 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(); |
| |
| 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): %d data bytes\n", |
| hostent->h_name, |
| inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr), |
| 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); |
| } |
| |
| 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++; |
| options = 0; |
| /* 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 = atoi(*argv); |
| break; |
| case 's': |
| if (--argc <= 0) |
| bb_show_usage(); |
| argv++; |
| datalen = atoi(*argv); |
| break; |
| default: |
| bb_show_usage(); |
| } |
| argc--; |
| argv++; |
| } |
| if (argc < 1) |
| bb_show_usage(); |
| |
| myid = getpid() & 0xFFFF; |
| ping(*argv); |
| return EXIT_SUCCESS; |
| } |
| #endif /* ! CONFIG_FEATURE_FANCY_PING */ |