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/*
Copyright (C) 2008-2025 Free Software Foundation, Inc.
This file is part of GNU Inetutils.
GNU Inetutils 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 3 of the License, or (at
your option) any later version.
GNU Inetutils 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, see `http://www.gnu.org/licenses/'. */
#include <config.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/time.h>
#include <netinet/in.h>
/*#include <netinet/ip_icmp.h> -- deliberately not including this */
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#if defined HAVE_IDN2_H && defined HAVE_IDN2
# include <idn2.h>
#elif defined HAVE_IDNA_H
# include <idna.h>
#endif
#include <timespec.h>
#include "ping.h"
static int useless_ident = 0; /* Relevant at least for Linux. */
static size_t _ping_packetsize (PING * p);
size_t
_ping_packetsize (PING *p)
{
if (p->ping_type == ICMP_TIMESTAMP || p->ping_type == ICMP_TIMESTAMPREPLY)
return ICMP_TSLEN;
if (p->ping_type == ICMP_ADDRESS || p->ping_type == ICMP_ADDRESSREPLY)
return ICMP_MASKLEN;
return PING_HEADER_LEN + p->ping_datalen;
}
PING *
ping_init (int type, int ident)
{
int fd;
struct protoent *proto;
PING *p;
/* Initialize raw ICMP socket */
proto = getprotobyname ("icmp");
if (!proto)
{
fprintf (stderr, "ping: unknown protocol icmp.\n");
return NULL;
}
fd = socket (AF_INET, SOCK_RAW, proto->p_proto);
if (fd < 0)
{
if (errno == EPERM || errno == EACCES)
{
errno = 0;
/* At least Linux can allow subprivileged users to send ICMP
* packets formally encapsulated and built as a datagram socket,
* but then the identity number is set by the kernel itself.
*/
fd = socket (AF_INET, SOCK_DGRAM, proto->p_proto);
if (fd < 0)
{
if (errno == EPERM || errno == EACCES
|| errno == EPROTONOSUPPORT)
fprintf (stderr,
"ping: Lacking privilege for icmp socket.\n");
else
fprintf (stderr, "ping: %s\n", strerror (errno));
return NULL;
}
useless_ident++; /* SOCK_DGRAM overrides our set identity. */
}
else
return NULL;
}
/* Allocate PING structure and initialize it to default values */
p = malloc (sizeof (*p));
if (!p)
{
close (fd);
return p;
}
memset (p, 0, sizeof (*p));
p->ping_fd = fd;
p->ping_type = type;
p->ping_count = 0;
p->ping_interval = PING_DEFAULT_INTERVAL;
p->ping_datalen = sizeof (icmphdr_t);
/* Make sure we use only 16 bits in this field, id for icmp is a unsigned short. */
p->ping_ident = ident & 0xFFFF;
p->ping_cktab_size = PING_CKTABSIZE;
p->ping_start_time = current_timespec ();
return p;
}
void
ping_reset (PING *p)
{
p->ping_num_xmit = 0;
p->ping_num_recv = 0;
p->ping_num_rept = 0;
}
void
ping_set_type (PING *p, int type)
{
p->ping_type = type;
}
int
ping_xmit (PING *p)
{
int i, buflen;
if (_ping_setbuf (p, USE_IPV6))
return -1;
buflen = _ping_packetsize (p);
/* Mark sequence number as sent */
_PING_CLR (p, p->ping_num_xmit);
/* Encode ICMP header */
switch (p->ping_type)
{
case ICMP_ECHO:
icmp_echo_encode (p->ping_buffer, buflen, p->ping_ident,
p->ping_num_xmit);
break;
case ICMP_TIMESTAMP:
icmp_timestamp_encode (p->ping_buffer, buflen, p->ping_ident,
p->ping_num_xmit);
break;
case ICMP_ADDRESS:
icmp_address_encode (p->ping_buffer, buflen, p->ping_ident,
p->ping_num_xmit);
break;
default:
icmp_generic_encode (p->ping_buffer, buflen, p->ping_type,
p->ping_ident, p->ping_num_xmit);
break;
}
i = sendto (p->ping_fd, (char *) p->ping_buffer, buflen, 0,
(struct sockaddr *) &p->ping_dest.ping_sockaddr,
sizeof (struct sockaddr_in));
if (i < 0)
return -1;
else
{
p->ping_num_xmit++;
if (i != buflen)
printf ("ping: wrote %s %d chars, ret=%d\n",
p->ping_hostname, buflen, i);
}
return 0;
}
static int
my_echo_reply (PING *p, icmphdr_t *icmp)
{
struct ip *orig_ip = &icmp->icmp_ip;
icmphdr_t *orig_icmp = (icmphdr_t *) (orig_ip + 1);
return (orig_ip->ip_dst.s_addr == p->ping_dest.ping_sockaddr.sin_addr.s_addr
&& orig_ip->ip_p == IPPROTO_ICMP
&& orig_icmp->icmp_type == ICMP_ECHO
&& (ntohs (orig_icmp->icmp_id) == p->ping_ident || useless_ident));
}
int
ping_recv (PING *p)
{
socklen_t fromlen = sizeof (p->ping_from.ping_sockaddr);
int n, rc;
icmphdr_t *icmp;
struct ip *ip;
int dupflag;
n = recvfrom (p->ping_fd,
(char *) p->ping_buffer, _PING_BUFLEN (p, USE_IPV6), 0,
(struct sockaddr *) &p->ping_from.ping_sockaddr, &fromlen);
if (n < 0)
return -1;
rc = icmp_generic_decode (p->ping_buffer, n, &ip, &icmp);
if (rc < 0)
{
/*FIXME: conditional */
fprintf (stderr, "packet too short (%d bytes) from %s\n", n,
inet_ntoa (p->ping_from.ping_sockaddr.sin_addr));
return -1;
}
switch (icmp->icmp_type)
{
case ICMP_ECHOREPLY:
case ICMP_TIMESTAMPREPLY:
case ICMP_ADDRESSREPLY:
/* case ICMP_ROUTERADV: */
if (ntohs (icmp->icmp_id) != p->ping_ident && useless_ident == 0)
return -1;
if (rc)
fprintf (stderr, "checksum mismatch from %s\n",
inet_ntoa (p->ping_from.ping_sockaddr.sin_addr));
p->ping_num_recv++;
if (_PING_TST (p, ntohs (icmp->icmp_seq)))
{
p->ping_num_rept++;
p->ping_num_recv--;
dupflag = 1;
}
else
{
_PING_SET (p, ntohs (icmp->icmp_seq));
dupflag = 0;
}
if (p->ping_event.handler)
(*p->ping_event.handler) (dupflag ? PEV_DUPLICATE : PEV_RESPONSE,
p->ping_closure,
&p->ping_dest.ping_sockaddr,
&p->ping_from.ping_sockaddr, ip, icmp, n);
break;
case ICMP_ECHO:
case ICMP_TIMESTAMP:
case ICMP_ADDRESS:
return -1;
default:
if (!my_echo_reply (p, icmp))
return -1;
if (p->ping_event.handler)
(*p->ping_event.handler) (PEV_NOECHO,
p->ping_closure,
&p->ping_dest.ping_sockaddr,
&p->ping_from.ping_sockaddr, ip, icmp, n);
}
return 0;
}
void
ping_set_event_handler (PING *ping, ping_efp pf, void *closure)
{
ping->ping_event.handler = pf;
ping->ping_closure = closure;
}
void
ping_set_packetsize (PING *ping, size_t size)
{
ping->ping_datalen = size;
}
int
ping_set_dest (PING *ping, const char *host)
{
#if HAVE_DECL_GETADDRINFO
int rc;
struct addrinfo hints, *res;
char *rhost;
# if defined HAVE_IDN || defined HAVE_IDN2
rc = idna_to_ascii_lz (host, &rhost, 0); /* RHOST is allocated. */
if (rc)
return 1;
host = rhost;
# else
rhost = NULL;
# endif
memset (&hints, 0, sizeof (hints));
hints.ai_family = AF_INET;
hints.ai_flags = AI_CANONNAME;
# ifdef AI_IDN
hints.ai_flags |= AI_IDN;
# endif
# ifdef AI_CANONIDN
hints.ai_flags |= AI_CANONIDN;
# endif
rc = getaddrinfo (host, NULL, &hints, &res);
if (rc)
{
free (rhost);
return 1;
}
memcpy (&ping->ping_dest.ping_sockaddr, res->ai_addr, res->ai_addrlen);
if (res->ai_canonname)
ping->ping_hostname = strdup (res->ai_canonname);
else
# if defined HAVE_IDN || defined HAVE_IDN2
ping->ping_hostname = host;
# else
ping->ping_hostname = strdup (host);
# endif
freeaddrinfo (res);
return 0;
#else /* !HAVE_DECL_GETADDRINFO */
struct sockaddr_in *s_in = &ping->ping_dest.ping_sockaddr;
s_in->sin_family = AF_INET;
# ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
s_in->sin_len = sizeof (*s_in);
# endif
if (inet_aton (host, &s_in->sin_addr))
ping->ping_hostname = strdup (host);
else
{
struct hostent *hp;
# if defined HAVE_IDN || defined HAVE_IDN2
char *rhost;
int rc;
rc = idna_to_ascii_lz (host, &rhost, 0);
if (rc)
return 1;
hp = gethostbyname (rhost);
free (rhost);
# else/* !HAVE_IDN && !HAVE_IDN2 */
hp = gethostbyname (host);
# endif
if (!hp)
return 1;
s_in->sin_family = hp->h_addrtype;
if (hp->h_length > (int) sizeof (s_in->sin_addr))
hp->h_length = sizeof (s_in->sin_addr);
memcpy (&s_in->sin_addr, hp->h_addr, hp->h_length);
ping->ping_hostname = strdup (hp->h_name);
}
return 0;
#endif /* !HAVE_DECL_GETADDRINFO */
}
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