From 61d0abe95ab3c7461ca948fdc8824d08ad48cc6d Mon Sep 17 00:00:00 2001 From: octo Date: Sat, 4 Feb 2006 00:45:20 +0000 Subject: [PATCH] Added the first version of an own ping library.. --- src/liboping/Makefile | 14 + src/liboping/liboping.c | 836 +++++++++++++++++++++++++++++++++++++++++++ src/liboping/liboping.h | 89 +++++ src/liboping/test_liboping.c | 59 +++ 4 files changed, 998 insertions(+) create mode 100644 src/liboping/Makefile create mode 100644 src/liboping/liboping.c create mode 100644 src/liboping/liboping.h create mode 100644 src/liboping/test_liboping.c diff --git a/src/liboping/Makefile b/src/liboping/Makefile new file mode 100644 index 00000000..1233cce0 --- /dev/null +++ b/src/liboping/Makefile @@ -0,0 +1,14 @@ +CFLAGS=-Wall -Werror -O0 -g -DDEBUG=1 +#CFLAGS=-Wall -Werror -O3 + +all: test_liboping + +clean: + rm -f *.o + rm -f test_liboping + +liboping.o: liboping.c liboping.h + +test_liboping.o: test_liboping.c liboping.h + +test_liboping: test_liboping.o liboping.o diff --git a/src/liboping/liboping.c b/src/liboping/liboping.c new file mode 100644 index 00000000..a6d2c5db --- /dev/null +++ b/src/liboping/liboping.c @@ -0,0 +1,836 @@ +/** + * Object oriented C module to send ICMP and ICMPv6 `echo's. + * Copyright (C) 2006 Florian octo Forster + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include +#include +#include + +#include + +#include +#include +#include + +#include +#include +#include +#include + +#include +#include + +#include "liboping.h" + +#if DEBUG +# define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__) +#else +# define dprintf(format, ...) /**/ +#endif + +#define PING_DATA "Florian Forster http://verplant.org/" + +static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2, + struct timeval *res) +{ + + if ((tv1->tv_sec < tv2->tv_sec) + || ((tv1->tv_sec == tv2->tv_sec) + && (tv1->tv_usec < tv2->tv_usec))) + return (-1); + + res->tv_sec = tv1->tv_sec - tv2->tv_sec; + res->tv_usec = tv1->tv_usec - tv2->tv_usec; + + assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec > 0))); + + while (res->tv_usec < 0) + { + res->tv_usec += 1000000; + res->tv_sec--; + } + + return (0); +} + +static uint16_t ping_icmp4_checksum (char *buf, size_t len) +{ + uint32_t sum = 0; + uint16_t ret = 0; + + uint16_t *ptr; + + for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2) + sum += *ptr; + + if (len == 1) + { + *(char *) &ret = *(char *) ptr; + sum += ret; + } + + /* Do this twice to get all possible carries.. */ + sum = (sum >> 16) + (sum & 0xFFFF); + sum = (sum >> 16) + (sum & 0xFFFF); + + ret = ~sum; + + return (ret); +} + +static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffer_len) +{ + struct ip *ip_hdr; + struct icmphdr *icmp_hdr; + + size_t ip_hdr_len; + + uint16_t recv_checksum; + uint16_t calc_checksum; + + uint16_t ident; + uint16_t seq; + + pinghost_t *ptr; + + if (buffer_len < sizeof (struct ip)) + return (NULL); + + ip_hdr = (struct ip *) buffer; + ip_hdr_len = ip_hdr->ip_hl << 2; + + if (buffer_len < ip_hdr_len) + return (NULL); + + buffer += ip_hdr_len; + buffer_len -= ip_hdr_len; + + if (buffer_len < sizeof (struct icmphdr)) + return (NULL); + + icmp_hdr = (struct icmphdr *) buffer; + buffer += sizeof (struct icmphdr); + buffer_len -= sizeof (struct icmphdr); + + if (icmp_hdr->type != ICMP_ECHOREPLY) + { + dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->type); + return (NULL); + } + + recv_checksum = icmp_hdr->checksum; + icmp_hdr->checksum = 0; + calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr, + sizeof (struct icmphdr) + buffer_len); + + if (recv_checksum != calc_checksum) + { + dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n", + recv_checksum, calc_checksum); + return (NULL); + } + + ident = ntohs (icmp_hdr->un.echo.id); + seq = ntohs (icmp_hdr->un.echo.sequence); + + for (ptr = ph; ptr != NULL; ptr = ptr->next) + { + dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n", + ptr->hostname, ptr->ident, ptr->sequence - 1); + + if (ptr->addrfamily != AF_INET) + continue; + + if (!timerisset (ptr->timer)) + continue; + + if (ptr->ident != ident) + continue; + + if ((ptr->sequence - 1) != seq) + continue; + + dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n", + ptr->hostname, ident, seq); + + break; + } + + if (ptr == NULL) + { + dprintf ("No match found for ident = 0x%04x, seq = %i\n", + ident, seq); + } + + return (ptr); +} + +static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len) +{ + struct icmp6_hdr *icmp_hdr; + + uint16_t ident; + uint16_t seq; + + pinghost_t *ptr; + + if (buffer_len < sizeof (struct icmp6_hdr)) + return (NULL); + + icmp_hdr = (struct icmp6_hdr *) buffer; + buffer += sizeof (struct icmphdr); + buffer_len -= sizeof (struct icmphdr); + + if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY) + { + dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type); + return (NULL); + } + + if (icmp_hdr->icmp6_code != 0) + { + dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code); + return (NULL); + } + + ident = ntohs (icmp_hdr->icmp6_id); + seq = ntohs (icmp_hdr->icmp6_seq); + + for (ptr = ph; ptr != NULL; ptr = ptr->next) + { + dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n", + ptr->hostname, ptr->ident, ptr->sequence - 1); + + if (ptr->addrfamily != AF_INET6) + continue; + + if (!timerisset (ptr->timer)) + continue; + + if (ptr->ident != ident) + continue; + + if ((ptr->sequence - 1) != seq) + continue; + + dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n", + ptr->hostname, ident, seq); + + break; + } + + if (ptr == NULL) + { + dprintf ("No match found for ident = 0x%04x, seq = %i\n", + ident, seq); + } + + return (ptr); +} + +static void ping_receive_one (int fd, pinghost_t *ph) +{ + char buffer[4096]; + size_t buffer_len; + + struct timeval now; + struct timeval diff; + + pinghost_t *host = NULL; + + struct sockaddr_storage sa; + socklen_t sa_len; + + sa_len = sizeof (sa); + + buffer_len = recvfrom (fd, buffer, sizeof (buffer), 0, + (struct sockaddr *) &sa, &sa_len); + if (buffer_len == -1) + { + dprintf ("recvfrom: %s\n", strerror (errno)); + return; + } + + dprintf ("Read %i bytes from fd = %i\n", buffer_len, fd); + + if (sa.ss_family == AF_INET) + { + if ((host = ping_receive_ipv4 (ph, buffer, buffer_len)) == NULL) + return; + } + else if (sa.ss_family == AF_INET6) + { + if ((host = ping_receive_ipv6 (ph, buffer, buffer_len)) == NULL) + return; + } + + if (gettimeofday (&now, NULL) == -1) + { + dprintf ("gettimeofday: %s\n", strerror (errno)); + timerclear (host->timer); + return; + } + + dprintf ("sent: %12i.%06i\n", + (int) host->timer->tv_sec, + (int) host->timer->tv_usec); + dprintf ("rcvd: %12i.%06i\n", + (int) now.tv_sec, + (int) now.tv_usec); + + if (ping_timeval_sub (&now, host->timer, &diff) < 0) + { + timerclear (host->timer); + return; + } + + dprintf ("diff: %12i.%06i\n", + (int) diff.tv_sec, + (int) diff.tv_usec); + + host->latency = ((double) diff.tv_usec) / 1000.0; + host->latency += ((double) diff.tv_sec) * 1000.0; + + timerclear (host->timer); +} + +static int ping_receive_all (pinghost_t *ph) +{ + fd_set readfds; + int num_readfds; + int max_readfds; + + pinghost_t *ptr; + + struct timeval endtime; + struct timeval nowtime; + struct timeval timeout; + int status; + + if (gettimeofday (&endtime, NULL) == -1) + return (-1); + endtime.tv_sec += 1; + + for (ptr = ph; ptr != NULL; ptr = ptr->next) + ptr->latency = -1.0; + + while (1) + { + FD_ZERO (&readfds); + num_readfds = 0; + max_readfds = -1; + + if (gettimeofday (&nowtime, NULL) == -1) + return (-1); + + if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1) + return (0); + + for (ptr = ph; ptr != NULL; ptr = ptr->next) + { + if (!timerisset (ptr->timer)) + continue; + + FD_SET (ptr->fd, &readfds); + num_readfds++; + + if (max_readfds < ptr->fd) + max_readfds = ptr->fd; + } + + if (num_readfds == 0) + break; + + dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds, + (int) timeout.tv_sec, + (int) timeout.tv_usec); + + status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout); + + if (status == EINTR) + { + dprintf ("select was interrupted by signal..\n"); + break; /* XXX */ + continue; + } + else if (status < 0) + { + dprintf ("select: %s\n", strerror (errno)); + break; + } + else if (status == 0) + { + dprintf ("select timed out\n"); + break; + } + + for (ptr = ph; ptr != NULL; ptr = ptr->next) + { + if (FD_ISSET (ptr->fd, &readfds)) + ping_receive_one (ptr->fd, ph); + } + } + + /* FIXME - return correct status */ + return (0); +} + +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * Sending functions: * + * * + * ping_send_all * + * +-> ping_send_one_ipv4 * + * `-> ping_send_one_ipv6 * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ +static int ping_send_one_ipv4 (pinghost_t *ph) +{ + struct icmphdr *icmp4; + int status; + + char buf[4096]; + int buflen; + + char *data; + int datalen; + + dprintf ("ph->hostname = %s\n", ph->hostname); + + memset (buf, '\0', sizeof (buf)); + icmp4 = (struct icmphdr *) buf; + data = (char *) (icmp4 + 1); + + icmp4->type = ICMP_ECHO; + icmp4->code = 0; + /* The checksum will be calculated by the TCP/IP stack. */ + icmp4->checksum = 0; + icmp4->un.echo.id = htons (ph->ident); + icmp4->un.echo.sequence = htons (ph->sequence); + + strcpy (data, PING_DATA); + datalen = strlen (data); + + buflen = datalen + sizeof (struct icmphdr); + + icmp4->checksum = ping_icmp4_checksum (buf, buflen); + + dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident); + + status = sendto (ph->fd, buf, buflen, 0, + (struct sockaddr *) ph->addr, ph->addrlen); + if (status < 0) + { + perror ("sendto"); + return (-1); + } + + dprintf ("sendto: status = %i\n", status); + + return (0); +} + +static int ping_send_one_ipv6 (pinghost_t *ph) +{ + struct icmp6_hdr *icmp6; + int status; + + char buf[4096]; + int buflen; + + char *data; + int datalen; + + dprintf ("ph->hostname = %s\n", ph->hostname); + + memset (buf, '\0', sizeof (buf)); + icmp6 = (struct icmp6_hdr *) buf; + data = (char *) (icmp6 + 1); + + icmp6->icmp6_type = ICMP6_ECHO_REQUEST; + icmp6->icmp6_code = 0; + /* The checksum will be calculated by the TCP/IP stack. */ + icmp6->icmp6_cksum = 0; + icmp6->icmp6_id = htons (ph->ident); + icmp6->icmp6_seq = htons (ph->sequence); + + strcpy (data, PING_DATA); + datalen = strlen (data); + + buflen = datalen + sizeof (struct icmp6_hdr); + + dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident); + + status = sendto (ph->fd, buf, buflen, 0, + (struct sockaddr *) ph->addr, ph->addrlen); + if (status < 0) + { + perror ("sendto"); + return (-1); + } + + dprintf ("sendto: status = %i\n", status); + + return (0); +} + +static int ping_send_all (pinghost_t *ph) +{ + pinghost_t *ptr; + + for (ptr = ph; ptr != NULL; ptr = ptr->next) + { + /* start timer.. The GNU `ping6' starts the timer before + * sending the packet, so I will do that too */ + if (gettimeofday (ptr->timer, NULL) == -1) + { + dprintf ("gettimeofday: %s\n", strerror (errno)); + timerclear (ptr->timer); + continue; + } + else + { + dprintf ("timer set for hostname = %s\n", ptr->hostname); + } + + if (ptr->addrfamily == AF_INET6) + { + dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname); + if (ping_send_one_ipv6 (ptr) != 0) + { + timerclear (ptr->timer); + continue; + } + } + else if (ptr->addrfamily == AF_INET) + { + dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname); + if (ping_send_one_ipv4 (ptr) != 0) + { + timerclear (ptr->timer); + continue; + } + } + else /* this should not happen */ + { + dprintf ("Unknown address family: %i\n", ptr->addrfamily); + timerclear (ptr->timer); + continue; + } + + ptr->sequence++; + } + + /* FIXME */ + return (0); +} + +static int ping_get_ident (void) +{ + int fd; + static int did_seed = 0; + + int retval; + + if (did_seed == 0) + { + if ((fd = open ("/dev/urandom", O_RDONLY)) != -1) + { + unsigned int seed; + + if (read (fd, &seed, sizeof (seed)) != -1) + { + did_seed = 1; + dprintf ("Random seed: %i\n", seed); + srandom (seed); + } + + close (fd); + } + else + { + dprintf ("open (/dev/urandom): %s\n", strerror (errno)); + } + } + + retval = (int) random (); + + dprintf ("Random number: %i\n", retval); + + return (retval); +} + +static pinghost_t *ping_alloc (void) +{ + pinghost_t *ph; + size_t ph_size; + + ph_size = sizeof (pinghost_t) + + sizeof (struct sockaddr_storage) + + sizeof (struct timeval); + + ph = (pinghost_t *) malloc (ph_size); + if (ph == NULL) + return (NULL); + + memset (ph, '\0', ph_size); + + ph->timer = (struct timeval *) (ph + 1); + ph->addr = (struct sockaddr_storage *) (ph->timer + 1); + + ph->addrlen = sizeof (struct sockaddr_storage); + ph->latency = -1.0; + ph->ident = ping_get_ident () & 0xFFFF; + + return (ph); +} + +static void ping_free (pinghost_t *ph) +{ + if (ph->hostname != NULL) + free (ph->hostname); + + free (ph); +} + +/* + * public methods + */ +pingobj_t *ping_construct (int flags) +{ + pingobj_t *obj; + + if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL) + return (NULL); + + obj->flags = flags; + obj->head = NULL; + + return (obj); +} + +void ping_destroy (pingobj_t *obj) +{ + pinghost_t *current; + pinghost_t *next; + + current = obj->head; + next = NULL; + + while (current != NULL) + { + next = current->next; + ping_free (current); + current = next; + } + + free (obj); + + return; +} + +int ping_send (pingobj_t *obj) +{ + if (ping_send_all (obj->head) < 0) + return (-1); + + if (ping_receive_all (obj->head) < 0) + return (-2); + + return (0); +} + +static pinghost_t *ping_host_search (pinghost_t *ph, const char *host) +{ + while (ph != NULL) + { + if (strcasecmp (ph->hostname, host) == 0) + break; + + ph = ph->next; + } + + return (ph); +} + +int ping_host_add (pingobj_t *obj, const char *host) +{ + pinghost_t *ph; + + struct sockaddr_storage sockaddr; + socklen_t sockaddr_len; + + struct addrinfo ai_hints; + struct addrinfo *ai_list, *ai_ptr; + int ai_return; + + dprintf ("host = %s\n", host); + + if (ping_host_search (obj->head, host) != NULL) + return (0); + + memset (&ai_hints, '\0', sizeof (ai_hints)); + ai_hints.ai_flags = AI_ADDRCONFIG; + ai_hints.ai_family = PF_UNSPEC; + ai_hints.ai_socktype = SOCK_RAW; + + if ((ph = ping_alloc ()) == NULL) + { + dprintf ("Out of memory!\n"); + return (-1); + } + + if ((ph->hostname = strdup (host)) == NULL) + { + dprintf ("Out of memory!\n"); + ping_free (ph); + return (-1); + } + + if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0) + { + dprintf ("getaddrinfo failed\n"); + ping_free (ph); + return (-1); + } + + for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) + { + ph->fd = -1; + + sockaddr_len = sizeof (sockaddr); + memset (&sockaddr, '\0', sockaddr_len); + + if (ai_ptr->ai_family == AF_INET) + { + struct sockaddr_in *si; + + si = (struct sockaddr_in *) &sockaddr; + si->sin_family = AF_INET; + si->sin_port = htons (ph->ident); + si->sin_addr.s_addr = htonl (INADDR_ANY); + + ai_ptr->ai_protocol = IPPROTO_ICMP; + } + else if (ai_ptr->ai_family == AF_INET6) + { + struct sockaddr_in6 *si; + + si = (struct sockaddr_in6 *) &sockaddr; + si->sin6_family = AF_INET6; + si->sin6_port = htons (ph->ident); + si->sin6_addr = in6addr_any; + + ai_ptr->ai_protocol = IPPROTO_ICMPV6; + } + else + { + dprintf ("Unknown `ai_family': %i\n", ai_ptr->ai_family); + continue; + } + + ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol); + if (ph->fd == -1) + { + dprintf ("socket: %s\n", strerror (errno)); + continue; + } + + if (bind (ph->fd, (struct sockaddr *) &sockaddr, sockaddr_len) == -1) + { + dprintf ("bind: %s\n", strerror (errno)); + close (ph->fd); + ph->fd = -1; + continue; + } + + assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen); + memset (ph->addr, '\0', sizeof (struct sockaddr_storage)); + memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen); + ph->addrlen = ai_ptr->ai_addrlen; + ph->addrfamily = ai_ptr->ai_family; + + break; + } + + freeaddrinfo (ai_list); + + if (ph->fd < 0) + { + free (ph->hostname); + free (ph); + return (-1); + } + + ph->next = obj->head; + obj->head = ph; + + return (0); +} + +int ping_host_remove (pingobj_t *obj, const char *host) +{ + pinghost_t *pre, *cur; + + pre = NULL; + cur = obj->head; + + while (cur != NULL) + { + if (strcasecmp (host, cur->hostname)) + break; + + pre = cur; + cur = cur->next; + } + + if (cur == NULL) + return (-1); + + if (pre == NULL) + obj->head = cur->next; + else + pre->next = cur->next; + + if (cur->fd >= 0) + close (cur->fd); + + ping_free (cur); + + return (0); +} + +pingobj_iter_t *ping_iterator_get (pingobj_t *obj) +{ + return ((pingobj_iter_t *) obj->head); +} + +pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter) +{ + return ((pingobj_iter_t *) iter->next); +} + +const char *ping_iterator_get_host (pingobj_iter_t *iter) +{ + return (iter->hostname); +} + +double ping_iterator_get_latency (pingobj_iter_t *iter) +{ + return (iter->latency); +} diff --git a/src/liboping/liboping.h b/src/liboping/liboping.h new file mode 100644 index 00000000..f650abb0 --- /dev/null +++ b/src/liboping/liboping.h @@ -0,0 +1,89 @@ +/** + * Object oriented C module to send ICMP and ICMPv6 `echo's. + * Copyright (C) 2006 Florian octo Forster + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef OCTO_PING_H +#define OCTO_PING_H 1 + +#ifndef AI_ADDRCONFIG +#define AI_ADDRCONFIG 0 +#endif + +#include +#include + +/* FIXME BEGIN */ +#include +#include +#include + +#include + +#include +#include +#include +#include +#include + +#include +#include +/* FIXME END */ + +/* + * Type definitions + */ +typedef struct pinghost +{ + char *hostname; + struct sockaddr_storage *addr; + socklen_t addrlen; + int addrfamily; + int fd; + int ident; + int sequence; + struct timeval *timer; + double latency; + struct pinghost *next; +} pinghost_t; + +typedef struct +{ + int flags; + pinghost_t *head; +} pingobj_t; + +typedef pinghost_t pingobj_iter_t; + +/* + * Method definitions + */ +pingobj_t *ping_construct (int flags); +void ping_destroy (pingobj_t *obj); + +int ping_send (pingobj_t *obj); + +int ping_host_add (pingobj_t *obj, const char *host); +int ping_host_remove (pingobj_t *obj, const char *host); + +pingobj_iter_t *ping_iterator_get (pingobj_t *obj); +pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter); + +const char *ping_iterator_get_host (pingobj_iter_t *iter); +double ping_iterator_get_latency (pingobj_iter_t *iter); + +#endif /* OCTO_PING_H */ diff --git a/src/liboping/test_liboping.c b/src/liboping/test_liboping.c new file mode 100644 index 00000000..81698200 --- /dev/null +++ b/src/liboping/test_liboping.c @@ -0,0 +1,59 @@ +#include +#include + +#include "liboping.h" + +int main (int argc, char **argv) +{ + pingobj_t *ping; + pingobj_iter_t *iter; + + int i; + + if (argc < 2) + { + printf ("Usage: %s [host [host [...]]]\n", argv[0]); + return (1); + } + + if ((ping = ping_construct (0)) == NULL) + { + fprintf (stderr, "ping_construct failed\n"); + return (-1); + } + + for (i = 1; i < argc; i++) + { + printf ("Adding host `%s'..\n", argv[i]); + + if (ping_host_add (ping, argv[i]) > 0) + { + fprintf (stderr, "ping_host_add (verplant.org) failed\n"); + return (-1); + } + } + + while (1) + { + if (ping_send (ping) < 0) + { + fprintf (stderr, "ping_send failed\n"); + return (-1); + } + + for (iter = ping_iterator_get (ping); iter != NULL; iter = ping_iterator_next (iter)) + { + const char *host; + double latency; + + host = ping_iterator_get_host (iter); + latency = ping_iterator_get_latency (iter); + + printf ("host = %s, latency = %f\n", host, latency); + } + + sleep (5); + } + + return (0); +} -- 2.11.0