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/* ping.c - check network connectivity
*
* Copyright 2014 Rob Landley <rob@landley.net>
*
* Not in SUSv4.
USE_PING(NEWTOY(ping, "<1>1t#<0>255c#<0s#<0>65535I:W#<0w#<0q46[-46]", TOYFLAG_ROOTONLY|TOYFLAG_USR|TOYFLAG_BIN))
config PING
bool "ping"
default n
help
usage: ping [OPTIONS] HOST
Check network connectivity by sending packets to a host and reporting
its response.
Send ICMP ECHO_REQUEST packets to ipv4 or ipv6 addresses and prints each
echo it receives back, with round trip time.
Options:
-4, -6 Force IPv4 or IPv6
-c CNT Send CNT many packets
-I IFACE/IP Source interface or address
-q Quiet, only displays output at start and when finished
-s SIZE Packet SIZE in bytes (default 56)
-t TTL Set Time (number of hops) To Live
-W SEC Seconds to wait for response after all packets sent (default 10)
-w SEC Exit after this many seconds
*/
#define FOR_ping
#include "toys.h"
#include <ifaddrs.h>
GLOBALS(
long wait_exit;
long wait_resp;
char *iface;
long size;
long count;
long ttl;
int sock;
)
void ping_main(void)
{
int family, protocol;
union {
struct in_addr in;
struct in6_addr in6;
} src_addr;
char *host = 0;
// Determine IPv4 vs IPv6 type
if(!(toys.optflags & (FLAG_4|FLAG_6))) {
// todo getaddrinfo instead?
if (inet_pton(AF_INET6, toys.optargs[0], (void*)&src_addr))
toys.optflags |= FLAG_6;
}
if (toys.optflags & FLAG_6) {
family = AF_INET6;
protocol = IPPROTO_ICMPV6;
} else {
family = AF_INET;
protocol = IPPROTO_ICMP;
}
if (!(toys.optflags & FLAG_s)) TT.size = 56; // 64-PHDR_LEN
if (TT.iface) {
memset(&src_addr, 0, sizeof(src_addr));
// IP address?
if (!inet_pton(family, TT.iface, &src_addr)) {
struct ifaddrs *ifsave, *ifa = 0;
// Interface name?
if (!getifaddrs(&ifsave)) {
for (ifa = ifsave; ifa; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr || ifa->ifa_addr->sa_family != family) continue;
if (!strcmp(ifa->ifa_name, TT.iface)) {
if (family == AF_INET)
memcpy(&src_addr,
&((struct sockaddr_in *)ifa->ifa_addr)->sin_addr,
sizeof(struct in_addr));
else memcpy(&src_addr,
&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr,
sizeof(struct in6_addr));
break;
}
}
freeifaddrs(ifsave);
}
if (!ifa)
error_exit("no v%d addr for -I %s", 4+2*(family==AF_INET6), TT.iface);
}
inet_ntop(family, &src_addr, toybuf, sizeof(toybuf));
host = xstrdup(toybuf);
}
printf("host=%s\n", host);
// Open raw socket
TT.sock = xsocket(family, SOCK_RAW, protocol);
}
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