/**
* Object oriented C module to send ICMP and ICMPv6 `echo's.
- * Copyright (C) 2006-2016 Florian octo Forster <ff at octo.it>
+ * Copyright (C) 2006-2017 Florian octo Forster <ff at octo.it>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
static void ping_free (pinghost_t *ph)
{
- if (ph->username != NULL)
- free (ph->username);
-
- if (ph->hostname != NULL)
- free (ph->hostname);
+ if (ph == NULL)
+ return;
- if (ph->data != NULL)
- free (ph->data);
+ free (ph->username);
+ free (ph->hostname);
+ free (ph->data);
free (ph);
}
+/* ping_open_socket opens, initializes and returns a new raw socket to use for
+ * ICMPv4 or ICMPv6 packets. addrfam must be either AF_INET or AF_INET6. On
+ * error, -1 is returned and obj->errmsg is set appropriately. */
static int ping_open_socket(pingobj_t *obj, int addrfam)
{
int fd;
}
else /* this should not happen */
{
+ ping_set_error (obj, "ping_open_socket", "Unknown address family");
dprintf ("Unknown address family: %i\n", addrfam);
- return (-1);
+ return -1;
}
if (fd == -1)
{
+ ping_set_errno (obj, errno);
#if WITH_DEBUG
char errbuf[PING_ERRMSG_LEN];
dprintf ("socket: %s\n",
sstrerror (errno, errbuf, sizeof (errbuf)));
#endif
- ping_set_errno (obj, errno);
return -1;
}
else if (fd >= FD_SETSIZE)
{
+ ping_set_errno (obj, EMFILE);
dprintf ("socket(2) returned file descriptor %d, which is above the file "
"descriptor limit for select(2) (FD_SETSIZE = %d)\n",
fd, FD_SETSIZE);
close (fd);
- ping_set_errno (obj, EMFILE);
return -1;
}
if (bind (fd, obj->srcaddr, obj->srcaddrlen) == -1)
{
+ ping_set_errno (obj, errno);
#if WITH_DEBUG
char errbuf[PING_ERRMSG_LEN];
dprintf ("bind: %s\n",
sstrerror (errno, errbuf, sizeof (errbuf)));
#endif
- ping_set_errno (obj, errno);
close (fd);
return -1;
}
if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
obj->device, strlen (obj->device) + 1) != 0)
{
+ ping_set_errno (obj, errno);
#if WITH_DEBUG
char errbuf[PING_ERRMSG_LEN];
dprintf ("setsockopt (SO_BINDTODEVICE): %s\n",
sstrerror (errno, errbuf, sizeof (errbuf)));
#endif
- ping_set_errno (obj, errno);
close (fd);
return -1;
}
#ifdef SO_TIMESTAMP
if (1) /* {{{ */
{
- int status;
- int opt = 1;
-
- status = setsockopt (fd,
- SOL_SOCKET, SO_TIMESTAMP,
- &opt, sizeof (opt));
+ int status = setsockopt (fd, SOL_SOCKET, SO_TIMESTAMP,
+ &(int){1}, sizeof(int));
if (status != 0)
{
+ ping_set_errno (obj, errno);
#if WITH_DEBUG
char errbuf[PING_ERRMSG_LEN];
dprintf ("setsockopt (SO_TIMESTAMP): %s\n",
sstrerror (errno, errbuf, sizeof (errbuf)));
#endif
- ping_set_errno (obj, errno);
close (fd);
return -1;
}
if (addrfam == AF_INET)
{
- int opt;
-
#ifdef IP_RECVTOS
/* Enable receiving the TOS field */
- opt = 1;
- setsockopt (fd, IPPROTO_IP, IP_RECVTOS,
- &opt, sizeof (opt));
+ setsockopt (fd, IPPROTO_IP, IP_RECVTOS, &(int){1}, sizeof(int));
#endif /* IP_RECVTOS */
/* Enable receiving the TTL field */
- opt = 1;
- setsockopt (fd, IPPROTO_IP, IP_RECVTTL,
- &opt, sizeof (opt));
+ setsockopt (fd, IPPROTO_IP, IP_RECVTTL, &(int){1}, sizeof(int));
}
#if defined(IPV6_RECVHOPLIMIT) || defined(IPV6_RECVTCLASS)
else if (addrfam == AF_INET6)
{
- int opt;
-
# if defined(IPV6_RECVHOPLIMIT)
/* For details see RFC 3542, section 6.3. */
- opt = 1;
setsockopt (fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
- &opt, sizeof (opt));
+ &(int){1}, sizeof(int));
# endif /* IPV6_RECVHOPLIMIT */
# if defined(IPV6_RECVTCLASS)
/* For details see RFC 3542, section 6.5. */
- opt = 1;
setsockopt (fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
- &opt, sizeof (opt));
+ &(int){1}, sizeof(int));
# endif /* IPV6_RECVTCLASS */
}
#endif /* IPV6_RECVHOPLIMIT || IPV6_RECVTCLASS */
{
pingobj_t *obj;
- if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
+ if ((obj = malloc (sizeof (*obj))) == NULL)
return (NULL);
- memset (obj, 0, sizeof (pingobj_t));
+ memset (obj, 0, sizeof (*obj));
obj->timeout = PING_DEF_TIMEOUT;
obj->ttl = PING_DEF_TTL;
void ping_destroy (pingobj_t *obj)
{
pinghost_t *current;
- pinghost_t *next;
if (obj == NULL)
return;
current = obj->head;
- next = NULL;
while (current != NULL)
{
- next = current->next;
+ pinghost_t *next = current->next;
ping_free (current);
current = next;
}
- if (obj->data != NULL)
- free (obj->data);
-
- if (obj->srcaddr != NULL)
- free (obj->srcaddr);
-
- if (obj->device != NULL)
- free (obj->device);
+ free (obj->data);
+ free (obj->srcaddr);
+ free (obj->device);
if (obj->fd4 != -1)
close(obj->fd4);
int ping_send (pingobj_t *obj)
{
- fd_set read_fds;
- fd_set write_fds;
- fd_set err_fds;
-
- int num_fds;
- int max_fd;
-
- pinghost_t *ph;
pinghost_t *ptr;
struct timeval endtime;
struct timeval nowtime;
struct timeval timeout;
- int status;
-
- int pings = 0;
- int ret = 0;
-
- ph = obj->head;
- int fd4 = obj->fd4;
- int fd6 = obj->fd6;
+ _Bool need_ipv4_socket = 0;
+ _Bool need_ipv6_socket = 0;
- for (ptr = ph; ptr != NULL; ptr = ptr->next)
+ for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
{
- if (fd6 == -1 && ptr->addrfamily == AF_INET6)
- {
- obj->fd6 = fd6 = ping_open_socket(obj, AF_INET6);
- ping_set_ttl (obj, obj->ttl);
- ping_set_qos (obj, obj->qos);
- }
- else if (fd4 == -1 && ptr->addrfamily == AF_INET)
- {
- obj->fd4 = fd4 = ping_open_socket(obj, AF_INET);
- ping_set_ttl (obj, obj->ttl);
- ping_set_qos (obj, obj->qos);
- }
-
- if ((fd6 == -1 && ptr->addrfamily == AF_INET6)
- || (fd4 == -1 && ptr->addrfamily == AF_INET))
- {
-#if WITH_DEBUG
- char errbuf[PING_ERRMSG_LEN];
- dprintf ("socket: %s\n",
- sstrerror (errno, errbuf, sizeof (errbuf)));
-#endif
- ping_set_errno (obj, errno);
- return (-1);
- }
-
ptr->latency = -1.0;
ptr->recv_ttl = -1;
+
+ if (ptr->addrfamily == AF_INET)
+ need_ipv4_socket = 1;
+ else if (ptr->addrfamily == AF_INET6)
+ need_ipv6_socket = 1;
}
- if (fd4 == -1 && fd6 == -1)
+ if (!need_ipv4_socket && !need_ipv6_socket)
{
- dprintf("No sockets to use\n");
+ ping_set_error (obj, "ping_send", "No hosts to ping");
return (-1);
}
+ if (need_ipv4_socket && obj->fd4 == -1)
+ {
+ obj->fd4 = ping_open_socket(obj, AF_INET);
+ if (obj->fd4 == -1)
+ return (-1);
+ ping_set_ttl (obj, obj->ttl);
+ ping_set_qos (obj, obj->qos);
+ }
+ if (need_ipv6_socket && obj->fd6 == -1)
+ {
+ obj->fd6 = ping_open_socket(obj, AF_INET6);
+ if (obj->fd6 == -1)
+ return (-1);
+ ping_set_ttl (obj, obj->ttl);
+ ping_set_qos (obj, obj->qos);
+ }
+
if (gettimeofday (&nowtime, NULL) == -1)
{
ping_set_errno (obj, errno);
ping_timeval_add (&nowtime, &timeout, &endtime);
- ptr = ph;
- num_fds = 0;
- if (fd4 != -1)
- num_fds++;
- if (fd6 != -1)
- num_fds++;
- max_fd = (fd4 > fd6) ? fd4 : fd6;
- assert (max_fd < FD_SETSIZE);
+ /* host_to_ping points to the host to which to send the next ping. The
+ * pointer is advanced to the next host in the linked list after the
+ * ping has been sent. If host_to_ping is NULL, no more pings need to be
+ * send out. */
+ pinghost_t *host_to_ping = obj->head;
+
+ /* pings_in_flight is the number of hosts we sent a "ping" to but didn't
+ * receive a "pong" yet. */
+ int pings_in_flight = 0;
+
+ /* pongs_received is the number of echo replies received. Unless there
+ * is an error, this is used as the return value of ping_send(). */
+ int pongs_received = 0;
- while (pings > 0 || ptr != NULL)
+ int error_count = 0;
+
+ while (pings_in_flight > 0 || host_to_ping != NULL)
{
+ fd_set read_fds;
+ fd_set write_fds;
+
+ int write_fd = -1;
+ int max_fd = -1;
+
FD_ZERO (&read_fds);
FD_ZERO (&write_fds);
- FD_ZERO (&err_fds);
- if (fd4 != -1)
+ if (obj->fd4 != -1)
{
- FD_SET(fd4, &read_fds);
- if (ptr != NULL && ptr->addrfamily == AF_INET)
- FD_SET(fd4, &write_fds);
- FD_SET(fd4, &err_fds);
+ FD_SET(obj->fd4, &read_fds);
+ if (host_to_ping != NULL && host_to_ping->addrfamily == AF_INET)
+ write_fd = obj->fd4;
+
+ if (max_fd < obj->fd4)
+ max_fd = obj->fd4;
}
- if (fd6 != -1)
+ if (obj->fd6 != -1)
{
- FD_SET(fd6, &read_fds);
- if (ptr != NULL && ptr->addrfamily == AF_INET6)
- FD_SET(fd6, &write_fds);
- FD_SET(fd6, &err_fds);
+ FD_SET(obj->fd6, &read_fds);
+ if (host_to_ping != NULL && host_to_ping->addrfamily == AF_INET6)
+ write_fd = obj->fd6;
+
+ if (max_fd < obj->fd6)
+ max_fd = obj->fd6;
}
+ if (write_fd != -1)
+ FD_SET(write_fd, &write_fds);
+
+ assert (max_fd != -1);
+ assert (max_fd < FD_SETSIZE);
+
if (gettimeofday (&nowtime, NULL) == -1)
{
ping_set_errno (obj, errno);
if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
break;
- dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_fds,
- (int) timeout.tv_sec,
- (int) timeout.tv_usec);
+ dprintf ("Waiting on %i sockets for %u.%06u seconds\n",
+ ((obj->fd4 != -1) ? 1 : 0) + ((obj->fd6 != -1) ? 1 : 0),
+ (unsigned) timeout.tv_sec,
+ (unsigned) timeout.tv_usec);
- status = select (max_fd + 1, &read_fds, &write_fds, &err_fds, &timeout);
+ int status = select (max_fd + 1, &read_fds, &write_fds, NULL, &timeout);
if (gettimeofday (&nowtime, NULL) == -1)
{
return (-1);
}
- if ((status == -1) && (errno == EINTR))
+ if (status == -1)
{
- dprintf ("select was interrupted by signal..\n");
- ping_set_errno (obj, EINTR);
+ ping_set_errno (obj, errno);
+ dprintf ("select: %s\n", obj->errmsg);
return (-1);
}
- else if (status < 0)
- {
-#if WITH_DEBUG
- char errbuf[PING_ERRMSG_LEN];
- dprintf ("select: %s\n",
- sstrerror (errno, errbuf, sizeof (errbuf)));
-#endif
- break;
- }
else if (status == 0)
{
dprintf ("select timed out\n");
- for (ptr = ph; ptr != NULL; ptr = ptr->next)
- if (ptr->latency < 0.0)
- ptr->dropped++;
+ pinghost_t *ph;
+ for (ph = obj->head; ph != NULL; ph = ph->next)
+ if (ph->latency < 0.0)
+ ph->dropped++;
break;
}
- if (fd4 != -1)
+ /* first, check if we can receive a reply ... */
+ if (obj->fd6 != -1 && FD_ISSET (obj->fd6, &read_fds))
{
- if (FD_ISSET (fd4, &read_fds))
+ if (ping_receive_one (obj, &nowtime, AF_INET6) == 0)
{
- if (!ping_receive_one(obj, &nowtime, AF_INET))
- --pings;
+ pings_in_flight--;
+ pongs_received++;
}
- else if (ptr != NULL && ptr->addrfamily == AF_INET &&
- FD_ISSET (fd4, &write_fds))
- {
- if (!ping_send_one(obj, ptr, fd4))
- {
- ptr = ptr->next;
- ++pings;
- }
- else
- {
- --ret;
- }
- }
-
+ continue;
}
-
- if (fd6 != -1)
+ if (obj->fd4 != -1 && FD_ISSET (obj->fd4, &read_fds))
{
- if (FD_ISSET (fd6, &read_fds))
- {
- if (!ping_receive_one(obj, &nowtime, AF_INET6))
- --pings;
- }
- else if (ptr != NULL && ptr->addrfamily == AF_INET6 &&
- FD_ISSET (fd6, &write_fds))
+ if (ping_receive_one (obj, &nowtime, AF_INET) == 0)
{
- if (!ping_send_one(obj, ptr, fd6))
- {
- ++pings;
- ptr = ptr->next;
- }
- else
- {
- --ret;
- }
+ pings_in_flight--;
+ pongs_received++;
}
+ continue;
}
+ /* ... and if no reply is available to read, continue sending
+ * out pings. */
+
+ /* this condition should always be true. We keep it for
+ * consistency with the read blocks above and just to be on the
+ * safe side. */
+ if (write_fd != -1 && FD_ISSET (write_fd, &write_fds))
+ {
+ if (ping_send_one (obj, host_to_ping, write_fd) == 0)
+ pings_in_flight++;
+ else
+ error_count++;
+ host_to_ping = host_to_ping->next;
+ continue;
+ }
} /* while (1) */
- return (ret);
+ if (error_count)
+ return (-1 * error_count);
+ return (pongs_received);
} /* int ping_send */
static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
return ((pingobj_iter_t *) iter->next);
}
+int ping_iterator_count (pingobj_t *obj)
+{
+ if (obj == NULL)
+ return 0;
+
+ int count = 0;
+ pingobj_iter_t *iter = obj->head;
+ while (iter) {
+ count++;
+ iter = iter->next;
+ }
+ return count;
+}
+
int ping_iterator_get_info (pingobj_iter_t *iter, int info,
void *buffer, size_t *buffer_len)
{
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