| /* |
| * Copyright (c) 1989 The Regents of the University of California. |
| * All rights reserved. |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Mike Muuss. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by the University of |
| * California, Berkeley and its contributors. |
| * 4. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #ifndef lint |
| char copyright[] = |
| "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ |
| All rights reserved.\n"; |
| #endif /* not lint */ |
| |
| /* |
| * P I N G . C |
| * |
| * Using the InterNet Control Message Protocol (ICMP) "ECHO" facility, |
| * measure round-trip-delays and packet loss across network paths. |
| * |
| * Author - |
| * Mike Muuss |
| * U. S. Army Ballistic Research Laboratory |
| * December, 1983 |
| * |
| * Status - |
| * Public Domain. Distribution Unlimited. |
| * Bugs - |
| * More statistics could always be gathered. |
| * This program has to run SUID to ROOT to access the ICMP socket. |
| */ |
| |
| #include "ping_common.h" |
| |
| #include <netinet/ip.h> |
| #include <netinet/ip_icmp.h> |
| #ifndef WITHOUT_IFADDRS |
| #include <ifaddrs.h> |
| #endif |
| |
| #ifndef ICMP_FILTER |
| #define ICMP_FILTER 1 |
| struct icmp_filter { |
| __u32 data; |
| }; |
| #endif |
| |
| #define MAXIPLEN 60 |
| #define MAXICMPLEN 76 |
| #define NROUTES 9 /* number of record route slots */ |
| #define TOS_MAX 255 /* 8-bit TOS field */ |
| #define MAX_HOSTNAMELEN NI_MAXHOST |
| |
| |
| static int ts_type; |
| static int nroute = 0; |
| static __u32 route[10]; |
| |
| |
| |
| struct sockaddr_in whereto; /* who to ping */ |
| int optlen = 0; |
| int settos = 0; /* Set TOS, Precendence or other QOS options */ |
| int icmp_sock; /* socket file descriptor */ |
| u_char outpack[0x10000]; |
| int maxpacket = sizeof(outpack); |
| |
| static int broadcast_pings = 0; |
| |
| static char *pr_addr(__u32); |
| static void pr_options(unsigned char * cp, int hlen); |
| static void pr_iph(struct iphdr *ip); |
| static void usage(void) __attribute__((noreturn)); |
| static u_short in_cksum(const u_short *addr, int len, u_short salt); |
| static void pr_icmph(__u8 type, __u8 code, __u32 info, struct icmphdr *icp); |
| static int parsetos(char *str); |
| |
| static struct { |
| struct cmsghdr cm; |
| struct in_pktinfo ipi; |
| } cmsg = { {sizeof(struct cmsghdr) + sizeof(struct in_pktinfo), SOL_IP, IP_PKTINFO}, |
| {0, }}; |
| int cmsg_len; |
| |
| struct sockaddr_in source; |
| char *device; |
| int pmtudisc = -1; |
| |
| |
| int |
| main(int argc, char **argv) |
| { |
| struct hostent *hp; |
| int ch, hold, packlen; |
| int socket_errno = 0; |
| u_char *packet; |
| char *target; |
| #ifdef USE_IDN |
| char *hnamebuf = NULL; |
| #else |
| char hnamebuf[MAX_HOSTNAMELEN]; |
| #endif |
| char rspace[3 + 4 * NROUTES + 1]; /* record route space */ |
| |
| #ifdef ANDROID |
| android_check_security(); |
| #endif |
| |
| limit_capabilities(); |
| |
| #ifdef USE_IDN |
| setlocale(LC_ALL, ""); |
| #endif |
| |
| icmp_sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP); |
| if (icmp_sock < 0) { |
| enable_capability_raw(); |
| icmp_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| socket_errno = errno; |
| disable_capability_raw(); |
| using_ping_socket = 0; |
| } |
| |
| source.sin_family = AF_INET; |
| |
| preload = 1; |
| while ((ch = getopt(argc, argv, COMMON_OPTSTR "bRT:")) != EOF) { |
| switch(ch) { |
| case 'b': |
| broadcast_pings = 1; |
| break; |
| case 'Q': |
| settos = parsetos(optarg); |
| if (settos && |
| (setsockopt(icmp_sock, IPPROTO_IP, IP_TOS, |
| (char *)&settos, sizeof(int)) < 0)) { |
| perror("ping: error setting QOS sockopts"); |
| exit(2); |
| } |
| break; |
| case 'R': |
| if (options & F_TIMESTAMP) { |
| fprintf(stderr, "Only one of -T or -R may be used\n"); |
| exit(2); |
| } |
| options |= F_RROUTE; |
| break; |
| case 'T': |
| if (options & F_RROUTE) { |
| fprintf(stderr, "Only one of -T or -R may be used\n"); |
| exit(2); |
| } |
| options |= F_TIMESTAMP; |
| if (strcmp(optarg, "tsonly") == 0) |
| ts_type = IPOPT_TS_TSONLY; |
| else if (strcmp(optarg, "tsandaddr") == 0) |
| ts_type = IPOPT_TS_TSANDADDR; |
| else if (strcmp(optarg, "tsprespec") == 0) |
| ts_type = IPOPT_TS_PRESPEC; |
| else { |
| fprintf(stderr, "Invalid timestamp type\n"); |
| exit(2); |
| } |
| break; |
| case 'I': |
| { |
| #if 0 |
| char dummy; |
| int i1, i2, i3, i4; |
| |
| if (sscanf(optarg, "%u.%u.%u.%u%c", |
| &i1, &i2, &i3, &i4, &dummy) == 4) { |
| __u8 *ptr; |
| ptr = (__u8*)&source.sin_addr; |
| ptr[0] = i1; |
| ptr[1] = i2; |
| ptr[2] = i3; |
| ptr[3] = i4; |
| options |= F_STRICTSOURCE; |
| } else { |
| device = optarg; |
| } |
| #else |
| if (inet_pton(AF_INET, optarg, &source.sin_addr) > 0) |
| options |= F_STRICTSOURCE; |
| else |
| device = optarg; |
| #endif |
| break; |
| } |
| case 'M': |
| if (strcmp(optarg, "do") == 0) |
| pmtudisc = IP_PMTUDISC_DO; |
| else if (strcmp(optarg, "dont") == 0) |
| pmtudisc = IP_PMTUDISC_DONT; |
| else if (strcmp(optarg, "want") == 0) |
| pmtudisc = IP_PMTUDISC_WANT; |
| else { |
| fprintf(stderr, "ping: wrong value for -M: do, dont, want are valid ones.\n"); |
| exit(2); |
| } |
| break; |
| case 'V': |
| printf("ping utility, iputils-%s\n", SNAPSHOT); |
| exit(0); |
| COMMON_OPTIONS |
| common_options(ch); |
| break; |
| default: |
| usage(); |
| } |
| } |
| argc -= optind; |
| argv += optind; |
| |
| if (argc == 0) |
| usage(); |
| if (argc > 1) { |
| if (options & F_RROUTE) |
| usage(); |
| else if (options & F_TIMESTAMP) { |
| if (ts_type != IPOPT_TS_PRESPEC) |
| usage(); |
| if (argc > 5) |
| usage(); |
| } else { |
| if (argc > 10) |
| usage(); |
| options |= F_SOURCEROUTE; |
| } |
| } |
| while (argc > 0) { |
| target = *argv; |
| |
| memset((char *)&whereto, 0, sizeof(whereto)); |
| whereto.sin_family = AF_INET; |
| if (inet_aton(target, &whereto.sin_addr) == 1) { |
| hostname = target; |
| if (argc == 1) |
| options |= F_NUMERIC; |
| } else { |
| char *idn; |
| #ifdef USE_IDN |
| int rc; |
| |
| if (hnamebuf) { |
| free(hnamebuf); |
| hnamebuf = NULL; |
| } |
| |
| rc = idna_to_ascii_lz(target, &idn, 0); |
| if (rc != IDNA_SUCCESS) { |
| fprintf(stderr, "ping: IDN encoding failed: %s\n", idna_strerror(rc)); |
| exit(2); |
| } |
| #else |
| idn = target; |
| #endif |
| hp = gethostbyname(idn); |
| if (!hp) { |
| fprintf(stderr, "ping: unknown host %s\n", target); |
| exit(2); |
| } |
| #ifdef USE_IDN |
| free(idn); |
| #endif |
| memcpy(&whereto.sin_addr, hp->h_addr, 4); |
| #ifdef USE_IDN |
| if (idna_to_unicode_lzlz(hp->h_name, &hnamebuf, 0) != IDNA_SUCCESS) { |
| hnamebuf = strdup(hp->h_name); |
| if (!hnamebuf) { |
| perror("ping: strdup"); |
| exit(-1); |
| } |
| } |
| #else |
| strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1); |
| hnamebuf[sizeof(hnamebuf) - 1] = 0; |
| #endif |
| hostname = hnamebuf; |
| } |
| if (argc > 1) |
| route[nroute++] = whereto.sin_addr.s_addr; |
| argc--; |
| argv++; |
| } |
| |
| if (source.sin_addr.s_addr == 0) { |
| socklen_t alen; |
| struct sockaddr_in dst = whereto; |
| int probe_fd = socket(AF_INET, SOCK_DGRAM, 0); |
| |
| if (probe_fd < 0) { |
| perror("socket"); |
| exit(2); |
| } |
| if (device) { |
| struct ifreq ifr; |
| int rc; |
| |
| memset(&ifr, 0, sizeof(ifr)); |
| strncpy(ifr.ifr_name, device, IFNAMSIZ-1); |
| |
| enable_capability_raw(); |
| rc = setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1); |
| disable_capability_raw(); |
| |
| if (rc == -1) { |
| if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { |
| struct ip_mreqn imr; |
| if (ioctl(probe_fd, SIOCGIFINDEX, &ifr) < 0) { |
| fprintf(stderr, "ping: unknown iface %s\n", device); |
| exit(2); |
| } |
| memset(&imr, 0, sizeof(imr)); |
| imr.imr_ifindex = ifr.ifr_ifindex; |
| if (setsockopt(probe_fd, SOL_IP, IP_MULTICAST_IF, &imr, sizeof(imr)) == -1) { |
| perror("ping: IP_MULTICAST_IF"); |
| exit(2); |
| } |
| } else { |
| perror("ping: SO_BINDTODEVICE"); |
| exit(2); |
| } |
| } |
| } |
| |
| if (settos && |
| setsockopt(probe_fd, IPPROTO_IP, IP_TOS, (char *)&settos, sizeof(int)) < 0) |
| perror("Warning: error setting QOS sockopts"); |
| |
| dst.sin_port = htons(1025); |
| if (nroute) |
| dst.sin_addr.s_addr = route[0]; |
| if (connect(probe_fd, (struct sockaddr*)&dst, sizeof(dst)) == -1) { |
| if (errno == EACCES) { |
| if (broadcast_pings == 0) { |
| fprintf(stderr, "Do you want to ping broadcast? Then -b\n"); |
| exit(2); |
| } |
| fprintf(stderr, "WARNING: pinging broadcast address\n"); |
| if (setsockopt(probe_fd, SOL_SOCKET, SO_BROADCAST, |
| &broadcast_pings, sizeof(broadcast_pings)) < 0) { |
| perror ("can't set broadcasting"); |
| exit(2); |
| } |
| if (connect(probe_fd, (struct sockaddr*)&dst, sizeof(dst)) == -1) { |
| perror("connect"); |
| exit(2); |
| } |
| } else { |
| perror("connect"); |
| exit(2); |
| } |
| } |
| alen = sizeof(source); |
| if (getsockname(probe_fd, (struct sockaddr*)&source, &alen) == -1) { |
| perror("getsockname"); |
| exit(2); |
| } |
| source.sin_port = 0; |
| |
| #ifndef WITHOUT_IFADDRS |
| if (device) { |
| struct ifaddrs *ifa0, *ifa; |
| int ret; |
| |
| ret = getifaddrs(&ifa0); |
| if (ret) { |
| fprintf(stderr, "gatifaddrs() failed.\n"); |
| exit(2); |
| } |
| for (ifa = ifa0; ifa; ifa = ifa->ifa_next) { |
| if (!ifa->ifa_addr || ifa->ifa_addr->sa_family != AF_INET) |
| continue; |
| if (!strncmp(ifa->ifa_name, device, sizeof(device) - 1) && |
| !memcmp(&((struct sockaddr_in *)ifa->ifa_addr)->sin_addr, |
| &source.sin_addr, sizeof(source.sin_addr))) |
| break; |
| } |
| freeifaddrs(ifa0); |
| if (!ifa) |
| fprintf(stderr, "ping: Warning: source address might be selected on device other than %s.\n", device); |
| } |
| #endif |
| close(probe_fd); |
| } while (0); |
| |
| if (whereto.sin_addr.s_addr == 0) |
| whereto.sin_addr.s_addr = source.sin_addr.s_addr; |
| |
| if (icmp_sock < 0) { |
| errno = socket_errno; |
| perror("ping: icmp open socket"); |
| exit(2); |
| } |
| |
| if (device) { |
| struct ifreq ifr; |
| |
| memset(&ifr, 0, sizeof(ifr)); |
| strncpy(ifr.ifr_name, device, IFNAMSIZ-1); |
| if (ioctl(icmp_sock, SIOCGIFINDEX, &ifr) < 0) { |
| fprintf(stderr, "ping: unknown iface %s\n", device); |
| exit(2); |
| } |
| cmsg.ipi.ipi_ifindex = ifr.ifr_ifindex; |
| cmsg_len = sizeof(cmsg); |
| } |
| |
| if (broadcast_pings || IN_MULTICAST(ntohl(whereto.sin_addr.s_addr))) { |
| if (uid) { |
| if (interval < 1000) { |
| fprintf(stderr, "ping: broadcast ping with too short interval.\n"); |
| exit(2); |
| } |
| if (pmtudisc >= 0 && pmtudisc != IP_PMTUDISC_DO) { |
| fprintf(stderr, "ping: broadcast ping does not fragment.\n"); |
| exit(2); |
| } |
| } |
| if (pmtudisc < 0) |
| pmtudisc = IP_PMTUDISC_DO; |
| } |
| |
| if (pmtudisc >= 0) { |
| if (setsockopt(icmp_sock, SOL_IP, IP_MTU_DISCOVER, &pmtudisc, sizeof(pmtudisc)) == -1) { |
| perror("ping: IP_MTU_DISCOVER"); |
| exit(2); |
| } |
| } |
| |
| if ((options&F_STRICTSOURCE) && |
| bind(icmp_sock, (struct sockaddr*)&source, sizeof(source)) == -1) { |
| perror("bind"); |
| exit(2); |
| } |
| |
| if (!using_ping_socket) { |
| struct icmp_filter filt; |
| filt.data = ~((1<<ICMP_SOURCE_QUENCH)| |
| (1<<ICMP_DEST_UNREACH)| |
| (1<<ICMP_TIME_EXCEEDED)| |
| (1<<ICMP_PARAMETERPROB)| |
| (1<<ICMP_REDIRECT)| |
| (1<<ICMP_ECHOREPLY)); |
| if (setsockopt(icmp_sock, SOL_RAW, ICMP_FILTER, (char*)&filt, sizeof(filt)) == -1) |
| perror("WARNING: setsockopt(ICMP_FILTER)"); |
| } |
| |
| hold = 1; |
| if (setsockopt(icmp_sock, SOL_IP, IP_RECVERR, (char *)&hold, sizeof(hold))) |
| fprintf(stderr, "WARNING: your kernel is veeery old. No problems.\n"); |
| if (using_ping_socket) { |
| if (setsockopt(icmp_sock, SOL_IP, IP_RECVTTL, (char *)&hold, sizeof(hold))) |
| perror("WARNING: setsockopt(IP_RECVTTL)"); |
| if (setsockopt(icmp_sock, SOL_IP, IP_RETOPTS, (char *)&hold, sizeof(hold))) |
| perror("WARNING: setsockopt(IP_RETOPTS)"); |
| } |
| |
| /* record route option */ |
| if (options & F_RROUTE) { |
| memset(rspace, 0, sizeof(rspace)); |
| rspace[0] = IPOPT_NOP; |
| rspace[1+IPOPT_OPTVAL] = IPOPT_RR; |
| rspace[1+IPOPT_OLEN] = sizeof(rspace)-1; |
| rspace[1+IPOPT_OFFSET] = IPOPT_MINOFF; |
| optlen = 40; |
| if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, sizeof(rspace)) < 0) { |
| perror("ping: record route"); |
| exit(2); |
| } |
| } |
| if (options & F_TIMESTAMP) { |
| memset(rspace, 0, sizeof(rspace)); |
| rspace[0] = IPOPT_TIMESTAMP; |
| rspace[1] = (ts_type==IPOPT_TS_TSONLY ? 40 : 36); |
| rspace[2] = 5; |
| rspace[3] = ts_type; |
| if (ts_type == IPOPT_TS_PRESPEC) { |
| int i; |
| rspace[1] = 4+nroute*8; |
| for (i=0; i<nroute; i++) |
| *(__u32*)&rspace[4+i*8] = route[i]; |
| } |
| if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, rspace[1]) < 0) { |
| rspace[3] = 2; |
| if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, rspace[1]) < 0) { |
| perror("ping: ts option"); |
| exit(2); |
| } |
| } |
| optlen = 40; |
| } |
| if (options & F_SOURCEROUTE) { |
| int i; |
| memset(rspace, 0, sizeof(rspace)); |
| rspace[0] = IPOPT_NOOP; |
| rspace[1+IPOPT_OPTVAL] = (options & F_SO_DONTROUTE) ? IPOPT_SSRR |
| : IPOPT_LSRR; |
| rspace[1+IPOPT_OLEN] = 3 + nroute*4; |
| rspace[1+IPOPT_OFFSET] = IPOPT_MINOFF; |
| for (i=0; i<nroute; i++) |
| *(__u32*)&rspace[4+i*4] = route[i]; |
| |
| if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, 4 + nroute*4) < 0) { |
| perror("ping: record route"); |
| exit(2); |
| } |
| optlen = 40; |
| } |
| |
| /* Estimate memory eaten by single packet. It is rough estimate. |
| * Actually, for small datalen's it depends on kernel side a lot. */ |
| hold = datalen + 8; |
| hold += ((hold+511)/512)*(optlen + 20 + 16 + 64 + 160); |
| sock_setbufs(icmp_sock, hold); |
| |
| if (broadcast_pings) { |
| if (setsockopt(icmp_sock, SOL_SOCKET, SO_BROADCAST, |
| &broadcast_pings, sizeof(broadcast_pings)) < 0) { |
| perror ("ping: can't set broadcasting"); |
| exit(2); |
| } |
| } |
| |
| if (options & F_NOLOOP) { |
| int loop = 0; |
| if (setsockopt(icmp_sock, IPPROTO_IP, IP_MULTICAST_LOOP, |
| &loop, 1) == -1) { |
| perror ("ping: can't disable multicast loopback"); |
| exit(2); |
| } |
| } |
| if (options & F_TTL) { |
| int ittl = ttl; |
| if (setsockopt(icmp_sock, IPPROTO_IP, IP_MULTICAST_TTL, |
| &ttl, 1) == -1) { |
| perror ("ping: can't set multicast time-to-live"); |
| exit(2); |
| } |
| if (setsockopt(icmp_sock, IPPROTO_IP, IP_TTL, |
| &ittl, sizeof(ittl)) == -1) { |
| perror ("ping: can't set unicast time-to-live"); |
| exit(2); |
| } |
| } |
| |
| if (datalen > 0xFFFF - 8 - optlen - 20) { |
| if (uid || datalen > sizeof(outpack)-8) { |
| fprintf(stderr, "Error: packet size %d is too large. Maximum is %d\n", datalen, 0xFFFF-8-20-optlen); |
| exit(2); |
| } |
| /* Allow small oversize to root yet. It will cause EMSGSIZE. */ |
| fprintf(stderr, "WARNING: packet size %d is too large. Maximum is %d\n", datalen, 0xFFFF-8-20-optlen); |
| } |
| |
| if (datalen >= sizeof(struct timeval)) /* can we time transfer */ |
| timing = 1; |
| packlen = datalen + MAXIPLEN + MAXICMPLEN; |
| if (!(packet = (u_char *)malloc((u_int)packlen))) { |
| fprintf(stderr, "ping: out of memory.\n"); |
| exit(2); |
| } |
| |
| printf("PING %s (%s) ", hostname, inet_ntoa(whereto.sin_addr)); |
| if (device || (options&F_STRICTSOURCE)) |
| printf("from %s %s: ", inet_ntoa(source.sin_addr), device ?: ""); |
| printf("%d(%d) bytes of data.\n", datalen, datalen+8+optlen+20); |
| |
| setup(icmp_sock); |
| |
| main_loop(icmp_sock, packet, packlen); |
| } |
| |
| |
| int receive_error_msg() |
| { |
| int res; |
| char cbuf[512]; |
| struct iovec iov; |
| struct msghdr msg; |
| struct cmsghdr *cmsg; |
| struct sock_extended_err *e; |
| struct icmphdr icmph; |
| struct sockaddr_in target; |
| int net_errors = 0; |
| int local_errors = 0; |
| int saved_errno = errno; |
| |
| iov.iov_base = &icmph; |
| iov.iov_len = sizeof(icmph); |
| msg.msg_name = (void*)⌖ |
| msg.msg_namelen = sizeof(target); |
| msg.msg_iov = &iov; |
| msg.msg_iovlen = 1; |
| msg.msg_flags = 0; |
| msg.msg_control = cbuf; |
| msg.msg_controllen = sizeof(cbuf); |
| |
| res = recvmsg(icmp_sock, &msg, MSG_ERRQUEUE|MSG_DONTWAIT); |
| if (res < 0) |
| goto out; |
| |
| e = NULL; |
| for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { |
| if (cmsg->cmsg_level == SOL_IP) { |
| if (cmsg->cmsg_type == IP_RECVERR) |
| e = (struct sock_extended_err *)CMSG_DATA(cmsg); |
| } |
| } |
| if (e == NULL) |
| abort(); |
| |
| if (e->ee_origin == SO_EE_ORIGIN_LOCAL) { |
| local_errors++; |
| if (options & F_QUIET) |
| goto out; |
| if (options & F_FLOOD) |
| write_stdout("E", 1); |
| else if (e->ee_errno != EMSGSIZE) |
| fprintf(stderr, "ping: local error: %s\n", strerror(e->ee_errno)); |
| else |
| fprintf(stderr, "ping: local error: Message too long, mtu=%u\n", e->ee_info); |
| nerrors++; |
| } else if (e->ee_origin == SO_EE_ORIGIN_ICMP) { |
| struct sockaddr_in *sin = (struct sockaddr_in*)(e+1); |
| int error_pkt; |
| |
| if (res < sizeof(icmph) || |
| target.sin_addr.s_addr != whereto.sin_addr.s_addr || |
| icmph.type != ICMP_ECHO || |
| !is_ours(icmph.un.echo.id)) { |
| /* Not our error, not an error at all. Clear. */ |
| saved_errno = 0; |
| goto out; |
| } |
| |
| error_pkt = (e->ee_type != ICMP_REDIRECT && |
| e->ee_type != ICMP_SOURCE_QUENCH); |
| if (error_pkt) { |
| acknowledge(ntohs(icmph.un.echo.sequence)); |
| net_errors++; |
| nerrors++; |
| } |
| else { |
| saved_errno = 0; |
| } |
| |
| if (!using_ping_socket && !working_recverr) { |
| struct icmp_filter filt; |
| working_recverr = 1; |
| /* OK, it works. Add stronger filter. */ |
| filt.data = ~((1<<ICMP_SOURCE_QUENCH)| |
| (1<<ICMP_REDIRECT)| |
| (1<<ICMP_ECHOREPLY)); |
| if (setsockopt(icmp_sock, SOL_RAW, ICMP_FILTER, (char*)&filt, sizeof(filt)) == -1) |
| perror("\rWARNING: setsockopt(ICMP_FILTER)"); |
| } |
| |
| if (options & F_QUIET) |
| goto out; |
| if (options & F_FLOOD) { |
| if (error_pkt) |
| write_stdout("\bE", 2); |
| } else { |
| print_timestamp(); |
| printf("From %s: icmp_seq=%u ", pr_addr(sin->sin_addr.s_addr), ntohs(icmph.un.echo.sequence)); |
| pr_icmph(e->ee_type, e->ee_code, e->ee_info, NULL); |
| fflush(stdout); |
| } |
| } |
| |
| out: |
| errno = saved_errno; |
| return net_errors ? : -local_errors; |
| } |
| |
| /* |
| * pinger -- |
| * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet |
| * will be added on by the kernel. The ID field is our UNIX process ID, |
| * and the sequence number is an ascending integer. The first 8 bytes |
| * of the data portion are used to hold a UNIX "timeval" struct in VAX |
| * byte-order, to compute the round-trip time. |
| */ |
| int send_probe() |
| { |
| struct icmphdr *icp; |
| int cc; |
| int i; |
| |
| icp = (struct icmphdr *)outpack; |
| icp->type = ICMP_ECHO; |
| icp->code = 0; |
| icp->checksum = 0; |
| icp->un.echo.sequence = htons(ntransmitted+1); |
| icp->un.echo.id = ident; /* ID */ |
| |
| rcvd_clear(ntransmitted+1); |
| |
| if (timing) { |
| if (options&F_LATENCY) { |
| struct timeval tmp_tv; |
| gettimeofday(&tmp_tv, NULL); |
| memcpy(icp+1, &tmp_tv, sizeof(tmp_tv)); |
| } else { |
| memset(icp+1, 0, sizeof(struct timeval)); |
| } |
| } |
| |
| cc = datalen + 8; /* skips ICMP portion */ |
| |
| /* compute ICMP checksum here */ |
| icp->checksum = in_cksum((u_short *)icp, cc, 0); |
| |
| if (timing && !(options&F_LATENCY)) { |
| struct timeval tmp_tv; |
| gettimeofday(&tmp_tv, NULL); |
| memcpy(icp+1, &tmp_tv, sizeof(tmp_tv)); |
| icp->checksum = in_cksum((u_short *)&tmp_tv, sizeof(tmp_tv), ~icp->checksum); |
| } |
| |
| do { |
| static struct iovec iov = {outpack, 0}; |
| static struct msghdr m = { &whereto, sizeof(whereto), |
| &iov, 1, &cmsg, 0, 0 }; |
| m.msg_controllen = cmsg_len; |
| iov.iov_len = cc; |
| |
| i = sendmsg(icmp_sock, &m, confirm); |
| confirm = 0; |
| } while (0); |
| |
| return (cc == i ? 0 : i); |
| } |
| |
| /* |
| * parse_reply -- |
| * Print out the packet, if it came from us. This logic is necessary |
| * because ALL readers of the ICMP socket get a copy of ALL ICMP packets |
| * which arrive ('tis only fair). This permits multiple copies of this |
| * program to be run without having intermingled output (or statistics!). |
| */ |
| void pr_echo_reply(__u8 *_icp, int len) |
| { |
| struct icmphdr *icp = (struct icmphdr *)_icp; |
| printf(" icmp_seq=%u", ntohs(icp->un.echo.sequence)); |
| } |
| |
| int |
| parse_reply(struct msghdr *msg, int cc, void *addr, struct timeval *tv) |
| { |
| struct sockaddr_in *from = addr; |
| __u8 *buf = msg->msg_iov->iov_base; |
| struct icmphdr *icp; |
| struct iphdr *ip; |
| int hlen; |
| int csfailed; |
| struct cmsghdr *cmsg; |
| int ttl; |
| __u8 *opts; |
| int optlen; |
| |
| /* Check the IP header */ |
| ip = (struct iphdr *)buf; |
| if (!using_ping_socket) { |
| hlen = ip->ihl*4; |
| if (cc < hlen + 8 || ip->ihl < 5) { |
| if (options & F_VERBOSE) |
| fprintf(stderr, "ping: packet too short (%d bytes) from %s\n", cc, |
| pr_addr(from->sin_addr.s_addr)); |
| return 1; |
| } |
| ttl = ip->ttl; |
| opts = buf + sizeof(struct iphdr); |
| optlen = hlen - sizeof(struct iphdr); |
| } else { |
| hlen = 0; |
| ttl = 0; |
| opts = buf; |
| optlen = 0; |
| for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
| if (cmsg->cmsg_level != SOL_IP) |
| continue; |
| if (cmsg->cmsg_type == IP_TTL) { |
| if (cmsg->cmsg_len < sizeof(int)) |
| continue; |
| ttl = *(int *) CMSG_DATA(cmsg); |
| } else if (cmsg->cmsg_type == IP_RETOPTS) { |
| opts = (__u8 *) CMSG_DATA(cmsg); |
| optlen = cmsg->cmsg_len; |
| } |
| } |
| } |
| |
| /* Now the ICMP part */ |
| cc -= hlen; |
| icp = (struct icmphdr *)(buf + hlen); |
| csfailed = in_cksum((u_short *)icp, cc, 0); |
| |
| if (icp->type == ICMP_ECHOREPLY) { |
| if (!is_ours(icp->un.echo.id)) |
| return 1; /* 'Twas not our ECHO */ |
| if (gather_statistics((__u8*)icp, sizeof(*icp), cc, |
| ntohs(icp->un.echo.sequence), |
| ttl, 0, tv, pr_addr(from->sin_addr.s_addr), |
| pr_echo_reply)) |
| return 0; |
| } else { |
| /* We fall here when a redirect or source quench arrived. |
| * Also this branch processes icmp errors, when IP_RECVERR |
| * is broken. */ |
| |
| switch (icp->type) { |
| case ICMP_ECHO: |
| /* MUST NOT */ |
| return 1; |
| case ICMP_SOURCE_QUENCH: |
| case ICMP_REDIRECT: |
| case ICMP_DEST_UNREACH: |
| case ICMP_TIME_EXCEEDED: |
| case ICMP_PARAMETERPROB: |
| { |
| struct iphdr * iph = (struct iphdr *)(&icp[1]); |
| struct icmphdr *icp1 = (struct icmphdr*)((unsigned char *)iph + iph->ihl*4); |
| int error_pkt; |
| if (cc < 8+sizeof(struct iphdr)+8 || |
| cc < 8+iph->ihl*4+8) |
| return 1; |
| if (icp1->type != ICMP_ECHO || |
| iph->daddr != whereto.sin_addr.s_addr || |
| !is_ours(icp1->un.echo.id)) |
| return 1; |
| error_pkt = (icp->type != ICMP_REDIRECT && |
| icp->type != ICMP_SOURCE_QUENCH); |
| if (error_pkt) { |
| acknowledge(ntohs(icp1->un.echo.sequence)); |
| if (working_recverr) { |
| return 0; |
| } else { |
| static int once; |
| /* Sigh, IP_RECVERR for raw socket |
| * was broken until 2.4.9. So, we ignore |
| * the first error and warn on the second. |
| */ |
| if (once++ == 1) |
| fprintf(stderr, "\rWARNING: kernel is not very fresh, upgrade is recommended.\n"); |
| if (once == 1) |
| return 0; |
| } |
| } |
| nerrors+=error_pkt; |
| if (options&F_QUIET) |
| return !error_pkt; |
| if (options & F_FLOOD) { |
| if (error_pkt) |
| write_stdout("\bE", 2); |
| return !error_pkt; |
| } |
| print_timestamp(); |
| printf("From %s: icmp_seq=%u ", |
| pr_addr(from->sin_addr.s_addr), |
| ntohs(icp1->un.echo.sequence)); |
| if (csfailed) |
| printf("(BAD CHECKSUM)"); |
| pr_icmph(icp->type, icp->code, ntohl(icp->un.gateway), icp); |
| return !error_pkt; |
| } |
| default: |
| /* MUST NOT */ |
| break; |
| } |
| if ((options & F_FLOOD) && !(options & (F_VERBOSE|F_QUIET))) { |
| if (!csfailed) |
| write_stdout("!E", 2); |
| else |
| write_stdout("!EC", 3); |
| return 0; |
| } |
| if (!(options & F_VERBOSE) || uid) |
| return 0; |
| if (options & F_PTIMEOFDAY) { |
| struct timeval recv_time; |
| gettimeofday(&recv_time, NULL); |
| printf("%lu.%06lu ", (unsigned long)recv_time.tv_sec, (unsigned long)recv_time.tv_usec); |
| } |
| printf("From %s: ", pr_addr(from->sin_addr.s_addr)); |
| if (csfailed) { |
| printf("(BAD CHECKSUM)\n"); |
| return 0; |
| } |
| pr_icmph(icp->type, icp->code, ntohl(icp->un.gateway), icp); |
| return 0; |
| } |
| |
| if (!(options & F_FLOOD)) { |
| pr_options(opts, optlen + sizeof(struct iphdr)); |
| |
| if (options & F_AUDIBLE) |
| putchar('\a'); |
| putchar('\n'); |
| fflush(stdout); |
| } else { |
| putchar('\a'); |
| fflush(stdout); |
| } |
| return 0; |
| } |
| |
| |
| #if BYTE_ORDER == LITTLE_ENDIAN |
| # define ODDBYTE(v) (v) |
| #elif BYTE_ORDER == BIG_ENDIAN |
| # define ODDBYTE(v) ((u_short)(v) << 8) |
| #else |
| # define ODDBYTE(v) htons((u_short)(v) << 8) |
| #endif |
| |
| u_short |
| in_cksum(const u_short *addr, register int len, u_short csum) |
| { |
| register int nleft = len; |
| const u_short *w = addr; |
| register u_short answer; |
| register int sum = csum; |
| |
| /* |
| * Our algorithm is simple, using a 32 bit accumulator (sum), |
| * we add sequential 16 bit words to it, and at the end, fold |
| * back all the carry bits from the top 16 bits into the lower |
| * 16 bits. |
| */ |
| while (nleft > 1) { |
| sum += *w++; |
| nleft -= 2; |
| } |
| |
| /* mop up an odd byte, if necessary */ |
| if (nleft == 1) |
| sum += ODDBYTE(*(u_char *)w); /* le16toh() may be unavailable on old systems */ |
| |
| /* |
| * add back carry outs from top 16 bits to low 16 bits |
| */ |
| sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ |
| sum += (sum >> 16); /* add carry */ |
| answer = ~sum; /* truncate to 16 bits */ |
| return (answer); |
| } |
| |
| /* |
| * pr_icmph -- |
| * Print a descriptive string about an ICMP header. |
| */ |
| void pr_icmph(__u8 type, __u8 code, __u32 info, struct icmphdr *icp) |
| { |
| switch(type) { |
| case ICMP_ECHOREPLY: |
| printf("Echo Reply\n"); |
| /* XXX ID + Seq + Data */ |
| break; |
| case ICMP_DEST_UNREACH: |
| switch(code) { |
| case ICMP_NET_UNREACH: |
| printf("Destination Net Unreachable\n"); |
| break; |
| case ICMP_HOST_UNREACH: |
| printf("Destination Host Unreachable\n"); |
| break; |
| case ICMP_PROT_UNREACH: |
| printf("Destination Protocol Unreachable\n"); |
| break; |
| case ICMP_PORT_UNREACH: |
| printf("Destination Port Unreachable\n"); |
| break; |
| case ICMP_FRAG_NEEDED: |
| printf("Frag needed and DF set (mtu = %u)\n", info); |
| break; |
| case ICMP_SR_FAILED: |
| printf("Source Route Failed\n"); |
| break; |
| case ICMP_NET_UNKNOWN: |
| printf("Destination Net Unknown\n"); |
| break; |
| case ICMP_HOST_UNKNOWN: |
| printf("Destination Host Unknown\n"); |
| break; |
| case ICMP_HOST_ISOLATED: |
| printf("Source Host Isolated\n"); |
| break; |
| case ICMP_NET_ANO: |
| printf("Destination Net Prohibited\n"); |
| break; |
| case ICMP_HOST_ANO: |
| printf("Destination Host Prohibited\n"); |
| break; |
| case ICMP_NET_UNR_TOS: |
| printf("Destination Net Unreachable for Type of Service\n"); |
| break; |
| case ICMP_HOST_UNR_TOS: |
| printf("Destination Host Unreachable for Type of Service\n"); |
| break; |
| case ICMP_PKT_FILTERED: |
| printf("Packet filtered\n"); |
| break; |
| case ICMP_PREC_VIOLATION: |
| printf("Precedence Violation\n"); |
| break; |
| case ICMP_PREC_CUTOFF: |
| printf("Precedence Cutoff\n"); |
| break; |
| default: |
| printf("Dest Unreachable, Bad Code: %d\n", code); |
| break; |
| } |
| if (icp && (options & F_VERBOSE)) |
| pr_iph((struct iphdr*)(icp + 1)); |
| break; |
| case ICMP_SOURCE_QUENCH: |
| printf("Source Quench\n"); |
| if (icp && (options & F_VERBOSE)) |
| pr_iph((struct iphdr*)(icp + 1)); |
| break; |
| case ICMP_REDIRECT: |
| switch(code) { |
| case ICMP_REDIR_NET: |
| printf("Redirect Network"); |
| break; |
| case ICMP_REDIR_HOST: |
| printf("Redirect Host"); |
| break; |
| case ICMP_REDIR_NETTOS: |
| printf("Redirect Type of Service and Network"); |
| break; |
| case ICMP_REDIR_HOSTTOS: |
| printf("Redirect Type of Service and Host"); |
| break; |
| default: |
| printf("Redirect, Bad Code: %d", code); |
| break; |
| } |
| printf("(New nexthop: %s)\n", pr_addr(icp ? icp->un.gateway : info)); |
| if (icp && (options & F_VERBOSE)) |
| pr_iph((struct iphdr*)(icp + 1)); |
| break; |
| case ICMP_ECHO: |
| printf("Echo Request\n"); |
| /* XXX ID + Seq + Data */ |
| break; |
| case ICMP_TIME_EXCEEDED: |
| switch(code) { |
| case ICMP_EXC_TTL: |
| printf("Time to live exceeded\n"); |
| break; |
| case ICMP_EXC_FRAGTIME: |
| printf("Frag reassembly time exceeded\n"); |
| break; |
| default: |
| printf("Time exceeded, Bad Code: %d\n", code); |
| break; |
| } |
| if (icp && (options & F_VERBOSE)) |
| pr_iph((struct iphdr*)(icp + 1)); |
| break; |
| case ICMP_PARAMETERPROB: |
| printf("Parameter problem: pointer = %u\n", icp ? (ntohl(icp->un.gateway)>>24) : info); |
| if (icp && (options & F_VERBOSE)) |
| pr_iph((struct iphdr*)(icp + 1)); |
| break; |
| case ICMP_TIMESTAMP: |
| printf("Timestamp\n"); |
| /* XXX ID + Seq + 3 timestamps */ |
| break; |
| case ICMP_TIMESTAMPREPLY: |
| printf("Timestamp Reply\n"); |
| /* XXX ID + Seq + 3 timestamps */ |
| break; |
| case ICMP_INFO_REQUEST: |
| printf("Information Request\n"); |
| /* XXX ID + Seq */ |
| break; |
| case ICMP_INFO_REPLY: |
| printf("Information Reply\n"); |
| /* XXX ID + Seq */ |
| break; |
| #ifdef ICMP_MASKREQ |
| case ICMP_MASKREQ: |
| printf("Address Mask Request\n"); |
| break; |
| #endif |
| #ifdef ICMP_MASKREPLY |
| case ICMP_MASKREPLY: |
| printf("Address Mask Reply\n"); |
| break; |
| #endif |
| default: |
| printf("Bad ICMP type: %d\n", type); |
| } |
| } |
| |
| void pr_options(unsigned char * cp, int hlen) |
| { |
| int i, j; |
| int optlen, totlen; |
| unsigned char * optptr; |
| static int old_rrlen; |
| static char old_rr[MAX_IPOPTLEN]; |
| |
| totlen = hlen-sizeof(struct iphdr); |
| optptr = cp; |
| |
| while (totlen > 0) { |
| if (*optptr == IPOPT_EOL) |
| break; |
| if (*optptr == IPOPT_NOP) { |
| totlen--; |
| optptr++; |
| printf("\nNOP"); |
| continue; |
| } |
| cp = optptr; |
| optlen = optptr[1]; |
| if (optlen < 2 || optlen > totlen) |
| break; |
| |
| switch (*cp) { |
| case IPOPT_SSRR: |
| case IPOPT_LSRR: |
| printf("\n%cSRR: ", *cp==IPOPT_SSRR ? 'S' : 'L'); |
| j = *++cp; |
| i = *++cp; |
| i -= 4; |
| cp++; |
| if (j > IPOPT_MINOFF) { |
| for (;;) { |
| __u32 address; |
| memcpy(&address, cp, 4); |
| cp += 4; |
| if (address == 0) |
| printf("\t0.0.0.0"); |
| else |
| printf("\t%s", pr_addr(address)); |
| j -= 4; |
| putchar('\n'); |
| if (j <= IPOPT_MINOFF) |
| break; |
| } |
| } |
| break; |
| case IPOPT_RR: |
| j = *++cp; /* get length */ |
| i = *++cp; /* and pointer */ |
| if (i > j) |
| i = j; |
| i -= IPOPT_MINOFF; |
| if (i <= 0) |
| break; |
| if (i == old_rrlen |
| && !memcmp(cp, old_rr, i) |
| && !(options & F_FLOOD)) { |
| printf("\t(same route)"); |
| i = ((i + 3) / 4) * 4; |
| cp += i; |
| break; |
| } |
| old_rrlen = i; |
| memcpy(old_rr, (char *)cp, i); |
| printf("\nRR: "); |
| cp++; |
| for (;;) { |
| __u32 address; |
| memcpy(&address, cp, 4); |
| cp += 4; |
| if (address == 0) |
| printf("\t0.0.0.0"); |
| else |
| printf("\t%s", pr_addr(address)); |
| i -= 4; |
| putchar('\n'); |
| if (i <= 0) |
| break; |
| } |
| break; |
| case IPOPT_TS: |
| { |
| int stdtime = 0, nonstdtime = 0; |
| __u8 flags; |
| j = *++cp; /* get length */ |
| i = *++cp; /* and pointer */ |
| if (i > j) |
| i = j; |
| i -= 5; |
| if (i <= 0) |
| break; |
| flags = *++cp; |
| printf("\nTS: "); |
| cp++; |
| for (;;) { |
| long l; |
| |
| if ((flags&0xF) != IPOPT_TS_TSONLY) { |
| __u32 address; |
| memcpy(&address, cp, 4); |
| cp += 4; |
| if (address == 0) |
| printf("\t0.0.0.0"); |
| else |
| printf("\t%s", pr_addr(address)); |
| i -= 4; |
| if (i <= 0) |
| break; |
| } |
| l = *cp++; |
| l = (l<<8) + *cp++; |
| l = (l<<8) + *cp++; |
| l = (l<<8) + *cp++; |
| |
| if (l & 0x80000000) { |
| if (nonstdtime==0) |
| printf("\t%ld absolute not-standard", l&0x7fffffff); |
| else |
| printf("\t%ld not-standard", (l&0x7fffffff) - nonstdtime); |
| nonstdtime = l&0x7fffffff; |
| } else { |
| if (stdtime==0) |
| printf("\t%ld absolute", l); |
| else |
| printf("\t%ld", l - stdtime); |
| stdtime = l; |
| } |
| i -= 4; |
| putchar('\n'); |
| if (i <= 0) |
| break; |
| } |
| if (flags>>4) |
| printf("Unrecorded hops: %d\n", flags>>4); |
| break; |
| } |
| default: |
| printf("\nunknown option %x", *cp); |
| break; |
| } |
| totlen -= optlen; |
| optptr += optlen; |
| } |
| } |
| |
| |
| /* |
| * pr_iph -- |
| * Print an IP header with options. |
| */ |
| void pr_iph(struct iphdr *ip) |
| { |
| int hlen; |
| u_char *cp; |
| |
| hlen = ip->ihl << 2; |
| cp = (u_char *)ip + 20; /* point to options */ |
| |
| printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst Data\n"); |
| printf(" %1x %1x %02x %04x %04x", |
| ip->version, ip->ihl, ip->tos, ip->tot_len, ip->id); |
| printf(" %1x %04x", ((ip->frag_off) & 0xe000) >> 13, |
| (ip->frag_off) & 0x1fff); |
| printf(" %02x %02x %04x", ip->ttl, ip->protocol, ip->check); |
| printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->saddr)); |
| printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->daddr)); |
| printf("\n"); |
| pr_options(cp, hlen); |
| } |
| |
| /* |
| * pr_addr -- |
| * Return an ascii host address as a dotted quad and optionally with |
| * a hostname. |
| */ |
| char * |
| pr_addr(__u32 addr) |
| { |
| struct hostent *hp; |
| static char buf[4096]; |
| |
| in_pr_addr = !setjmp(pr_addr_jmp); |
| |
| if (exiting || (options & F_NUMERIC) || |
| !(hp = gethostbyaddr((char *)&addr, 4, AF_INET))) |
| sprintf(buf, "%s", inet_ntoa(*(struct in_addr *)&addr)); |
| else { |
| char *s; |
| #if USE_IDN |
| if (idna_to_unicode_lzlz(hp->h_name, &s, 0) != IDNA_SUCCESS) |
| s = NULL; |
| #else |
| s = NULL; |
| #endif |
| snprintf(buf, sizeof(buf), "%s (%s)", s ? s : hp->h_name, |
| inet_ntoa(*(struct in_addr *)&addr)); |
| #if USE_IDN |
| free(s); |
| #endif |
| } |
| |
| in_pr_addr = 0; |
| |
| return(buf); |
| } |
| |
| |
| /* Set Type of Service (TOS) and other Quality of Service relating bits */ |
| int parsetos(char *str) |
| { |
| const char *cp; |
| int tos; |
| char *ep; |
| |
| /* handle both hex and decimal values */ |
| if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) { |
| cp = str + 2; |
| tos = (int)strtol(cp, &ep, 16); |
| } else |
| tos = (int)strtol(str, &ep, 10); |
| |
| /* doesn't look like decimal or hex, eh? */ |
| if (*ep != '\0') { |
| fprintf(stderr, "ping: \"%s\" bad value for TOS\n", str); |
| exit(2); |
| } |
| |
| if (tos > TOS_MAX) { |
| fprintf(stderr, "ping: the decimal value of TOS bits must be 0-254 (or zero)\n"); |
| exit(2); |
| } |
| return(tos); |
| } |
| |
| #include <linux/filter.h> |
| |
| void install_filter(void) |
| { |
| static int once; |
| static struct sock_filter insns[] = { |
| BPF_STMT(BPF_LDX|BPF_B|BPF_MSH, 0), /* Skip IP header. F..g BSD... Look into ping6. */ |
| BPF_STMT(BPF_LD|BPF_H|BPF_IND, 4), /* Load icmp echo ident */ |
| BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0xAAAA, 0, 1), /* Ours? */ |
| BPF_STMT(BPF_RET|BPF_K, ~0U), /* Yes, it passes. */ |
| BPF_STMT(BPF_LD|BPF_B|BPF_IND, 0), /* Load icmp type */ |
| BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, ICMP_ECHOREPLY, 1, 0), /* Echo? */ |
| BPF_STMT(BPF_RET|BPF_K, 0xFFFFFFF), /* No. It passes. */ |
| BPF_STMT(BPF_RET|BPF_K, 0) /* Echo with wrong ident. Reject. */ |
| }; |
| static struct sock_fprog filter = { |
| sizeof insns / sizeof(insns[0]), |
| insns |
| }; |
| |
| if (once || using_ping_socket) |
| return; |
| once = 1; |
| |
| /* Patch bpflet for current identifier. */ |
| insns[2] = (struct sock_filter)BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, htons(ident), 0, 1); |
| |
| if (setsockopt(icmp_sock, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter))) |
| perror("WARNING: failed to install socket filter\n"); |
| } |
| |
| #define USAGE_NEWLINE "\n " |
| |
| void usage(void) |
| { |
| fprintf(stderr, |
| "Usage: ping" |
| " [-" |
| "aAbBdDfhLnOqrRUvV" |
| "]" |
| " [-c count]" |
| " [-i interval]" |
| " [-I interface]" |
| USAGE_NEWLINE |
| " [-m mark]" |
| " [-M pmtudisc_option]" |
| " [-l preload]" |
| " [-p pattern]" |
| " [-Q tos]" |
| USAGE_NEWLINE |
| " [-s packetsize]" |
| " [-S sndbuf]" |
| " [-t ttl]" |
| " [-T timestamp_option]" |
| USAGE_NEWLINE |
| " [-w deadline]" |
| " [-W timeout]" |
| " [hop1 ...] destination" |
| "\n" |
| ); |
| exit(2); |
| } |