--- /dev/null
+/**
+ * Object oriented C module to send ICMP and ICMPv6 `echo's.
+ * Copyright (C) 2006 Florian octo Forster <octo at verplant.org>
+ *
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include <assert.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <sys/socket.h>
+#include <netdb.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/icmp6.h>
+
+#include <sys/time.h>
+#include <time.h>
+
+#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 <octo@verplant.org> 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);
+}
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