ref: cd747191012d0420ac631340d962da1f80cef0a5
dir: /sys/src/cmd/ip/ping.c/
/* ping for ip v4 and v6 */
#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <ip.h>
#include <bio.h>
#include <ndb.h>
#include "icmp.h"
enum {
MAXMSG = 32,
SLEEPMS = 1000,
SECOND = 1000000000LL,
MINUTE = 60*SECOND,
};
typedef struct Req Req;
struct Req
{
ushort seq; /* sequence number */
vlong time; /* time sent */
vlong rtt;
int ttl;
int replied;
Req *next;
};
typedef struct {
int version;
char *net;
int echocmd;
int echoreply;
unsigned iphdrsz;
void (*prreply)(Req *r, void *v);
void (*prlost)(ushort seq, void *v);
} Proto;
Req *first; /* request list */
Req *last; /* ... */
Lock listlock;
char *argv0;
int addresses;
int debug;
int done;
int flood;
int lostmsgs;
int lostonly;
int quiet;
int rcvdmsgs;
int rint;
ushort firstseq;
vlong sum;
int waittime = 5000;
static char *network, *target;
void lost(Req*, void*);
void reply(Req*, void*);
static void
usage(void)
{
fprint(2,
"usage: %s [-6alq] [-s msgsize] [-i millisecs] [-n #pings] dest\n",
argv0);
exits("usage");
}
static void
catch(void *a, char *msg)
{
USED(a);
if(strstr(msg, "alarm"))
noted(NCONT);
else if(strstr(msg, "die"))
exits("errors");
else
noted(NDFLT);
}
static void
prlost4(ushort seq, void *v)
{
Ip4hdr *ip4 = v;
print("lost %ud: %V -> %V\n", seq, ip4->src, ip4->dst);
}
static void
prlost6(ushort seq, void *v)
{
Ip6hdr *ip6 = v;
print("lost %ud: %I -> %I\n", seq, ip6->src, ip6->dst);
}
static void
prreply4(Req *r, void *v)
{
Ip4hdr *ip4 = v;
print("%ud: %V -> %V rtt %lld µs, avg rtt %lld µs, ttl = %d\n",
r->seq - firstseq, ip4->src, ip4->dst, r->rtt, sum/rcvdmsgs,
r->ttl);
}
static void
prreply6(Req *r, void *v)
{
Ip6hdr *ip6 = v;
print("%ud: %I -> %I rtt %lld µs, avg rtt %lld µs, ttl = %d\n",
r->seq - firstseq, ip6->src, ip6->dst, r->rtt, sum/rcvdmsgs,
r->ttl);
}
static Proto v4pr = {
4, "icmp",
EchoRequest, EchoReply,
IPV4HDR_LEN,
prreply4, prlost4,
};
static Proto v6pr = {
6, "icmpv6",
EchoRequestV6, EchoReplyV6,
IPV6HDR_LEN,
prreply6, prlost6,
};
static Proto *proto = &v4pr;
Icmphdr *
geticmp(void *v)
{
char *p = v;
return (Icmphdr *)(p + proto->iphdrsz);
}
void
clean(ushort seq, vlong now, void *v)
{
int ttl;
Req **l, *r;
ttl = 0;
if (v) {
if (proto->version == 4)
ttl = ((Ip4hdr *)v)->ttl;
else
ttl = ((Ip6hdr *)v)->ttl;
}
lock(&listlock);
last = nil;
for(l = &first; *l; ){
r = *l;
if(v && r->seq == seq){
r->rtt = now-r->time;
r->ttl = ttl;
reply(r, v);
}
if(now-r->time > MINUTE){
*l = r->next;
r->rtt = now-r->time;
if(v)
r->ttl = ttl;
if(r->replied == 0)
lost(r, v);
free(r);
}else{
last = r;
l = &r->next;
}
}
unlock(&listlock);
}
static uchar loopbacknet[IPaddrlen] = {
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0xff, 0xff,
127, 0, 0, 0
};
static uchar loopbackmask[IPaddrlen] = {
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0, 0, 0
};
/*
* find first ip addr suitable for proto and
* that isn't the friggin loopback address.
* deprecate link-local and multicast addresses.
*/
static int
myipvnaddr(uchar *ip, Proto *proto, char *net)
{
int ipisv4, wantv4;
Ipifc *nifc;
Iplifc *lifc;
uchar mynet[IPaddrlen], linklocal[IPaddrlen];
static Ipifc *ifc;
ipmove(linklocal, IPnoaddr);
wantv4 = proto->version == 4;
ifc = readipifc(net, ifc, -1);
for(nifc = ifc; nifc; nifc = nifc->next)
for(lifc = nifc->lifc; lifc; lifc = lifc->next){
maskip(lifc->ip, loopbackmask, mynet);
if(ipcmp(mynet, loopbacknet) == 0)
continue;
if(ISIPV6MCAST(lifc->ip) || ISIPV6LINKLOCAL(lifc->ip)) {
ipmove(linklocal, lifc->ip);
continue;
}
ipisv4 = isv4(lifc->ip) != 0;
if(ipcmp(lifc->ip, IPnoaddr) != 0 && wantv4 == ipisv4){
ipmove(ip, lifc->ip);
return 0;
}
}
/* no global unicast addrs found, fall back to link-local, if any */
ipmove(ip, linklocal);
return ipcmp(ip, IPnoaddr) == 0? -1: 0;
}
void
sender(int fd, int msglen, int interval, int n)
{
int i, extra;
ushort seq;
char buf[64*1024+512];
uchar me[IPaddrlen], mev4[IPv4addrlen];
Icmphdr *icmp;
Req *r;
srand(time(0));
firstseq = seq = rand();
icmp = geticmp(buf);
memset(buf, 0, proto->iphdrsz + ICMP_HDRSIZE);
for(i = proto->iphdrsz + ICMP_HDRSIZE; i < msglen; i++)
buf[i] = i;
icmp->type = proto->echocmd;
icmp->code = 0;
/* arguably the kernel should fill in the right src addr. */
myipvnaddr(me, proto, network);
if (proto->version == 4) {
v6tov4(mev4, me);
memmove(((Ip4hdr *)buf)->src, mev4, IPv4addrlen);
} else
ipmove(((Ip6hdr *)buf)->src, me);
if (addresses)
print("\t%I -> %s\n", me, target);
if(rint != 0 && interval <= 0)
rint = 0;
extra = 0;
for(i = 0; i < n; i++){
if(i != 0){
if(rint != 0)
extra = nrand(interval);
sleep(interval + extra);
}
r = malloc(sizeof *r);
if (r == nil)
continue;
hnputs(icmp->seq, seq);
r->seq = seq;
r->next = nil;
r->replied = 0;
r->time = nsec(); /* avoid early free in reply! */
lock(&listlock);
if(first == nil)
first = r;
else
last->next = r;
last = r;
unlock(&listlock);
r->time = nsec();
if(write(fd, buf, msglen) < msglen){
fprint(2, "%s: write failed: %r\n", argv0);
return;
}
seq++;
}
done = 1;
}
void
rcvr(int fd, int msglen, int interval, int nmsg)
{
int i, n, munged;
ushort x;
vlong now;
char err[ERRMAX];
uchar buf[64*1024+512];
Icmphdr *icmp;
Req *r;
sum = 0;
while(lostmsgs+rcvdmsgs < nmsg){
alarm((nmsg-lostmsgs-rcvdmsgs)*interval+waittime);
n = read(fd, buf, sizeof buf);
alarm(0);
if(n == 0)
strcpy(err, "got eof");
else if(n < 0)
rerrstr(err, sizeof(err));
now = nsec();
if(n <= 0){
print("%s\n", err);
clean(0, now+MINUTE, nil);
if(strstr(err, "interrupted") == nil)
sleep(waittime);
continue;
}
if(n < msglen){
print("bad len %d/%d\n", n, msglen);
continue;
}
icmp = geticmp(buf);
munged = 0;
for(i = proto->iphdrsz + ICMP_HDRSIZE; i < msglen; i++)
if(buf[i] != (uchar)i)
munged++;
if(munged)
print("corrupted reply\n");
x = nhgets(icmp->seq);
if(icmp->type != proto->echoreply || icmp->code != 0) {
print("bad type/code/sequence %d/%d/%d (want %d/%d/%d)\n",
icmp->type, icmp->code, x,
proto->echoreply, 0, x);
continue;
}
clean(x, now, buf);
}
lock(&listlock);
for(r = first; r; r = r->next)
if(r->replied == 0)
lostmsgs++;
unlock(&listlock);
if(!quiet && lostmsgs)
print("%d out of %d messages lost\n", lostmsgs,
lostmsgs+rcvdmsgs);
}
static int
isdottedquad(char *name)
{
int dot = 0, digit = 0;
for (; *name != '\0'; name++)
if (*name == '.')
dot++;
else if (isdigit(*name))
digit++;
else
return 0;
return dot && digit;
}
static int
isv6lit(char *name)
{
int colon = 0, hex = 0;
for (; *name != '\0'; name++)
if (*name == ':')
colon++;
else if (isxdigit(*name))
hex++;
else
return 0;
return colon;
}
/* from /sys/src/libc/9sys/dial.c */
enum
{
Maxstring = 128,
Maxpath = 256,
};
typedef struct DS DS;
struct DS {
/* dist string */
char buf[Maxstring];
char *netdir;
char *proto;
char *rem;
/* other args */
char *local;
char *dir;
int *cfdp;
};
/*
* parse a dial string
*/
static void
_dial_string_parse(char *str, DS *ds)
{
char *p, *p2;
strncpy(ds->buf, str, Maxstring);
ds->buf[Maxstring-1] = 0;
p = strchr(ds->buf, '!');
if(p == 0) {
ds->netdir = 0;
ds->proto = "net";
ds->rem = ds->buf;
} else {
if(*ds->buf != '/' && *ds->buf != '#'){
ds->netdir = 0;
ds->proto = ds->buf;
} else {
for(p2 = p; *p2 != '/'; p2--)
;
*p2++ = 0;
ds->netdir = ds->buf;
ds->proto = p2;
}
*p = 0;
ds->rem = p + 1;
}
}
/* end excerpt from /sys/src/libc/9sys/dial.c */
/* side effect: sets network & target */
static int
isv4name(char *name)
{
int r = 1;
char *root, *ip, *pr;
DS ds;
_dial_string_parse(name, &ds);
/* cope with leading /net.alt/icmp! and the like */
root = nil;
if (ds.netdir != nil) {
pr = strrchr(ds.netdir, '/');
if (pr == nil)
pr = ds.netdir;
else {
*pr++ = '\0';
root = ds.netdir;
network = strdup(root);
}
if (strcmp(pr, v4pr.net) == 0)
return 1;
if (strcmp(pr, v6pr.net) == 0)
return 0;
}
/* if it's a literal, it's obvious from syntax which proto it is */
free(target);
target = strdup(ds.rem);
if (isdottedquad(ds.rem))
return 1;
else if (isv6lit(ds.rem))
return 0;
/* map name to ip and look at its syntax */
ip = csgetvalue(root, "sys", ds.rem, "ip", nil);
if (ip == nil)
ip = csgetvalue(root, "dom", ds.rem, "ip", nil);
if (ip == nil)
ip = csgetvalue(root, "sys", ds.rem, "ipv6", nil);
if (ip == nil)
ip = csgetvalue(root, "dom", ds.rem, "ipv6", nil);
if (ip != nil)
r = isv4name(ip);
free(ip);
return r;
}
void
main(int argc, char **argv)
{
int fd, msglen, interval, nmsg;
char *ds;
nsec(); /* make sure time file is already open */
fmtinstall('V', eipfmt);
fmtinstall('I', eipfmt);
msglen = interval = 0;
nmsg = MAXMSG;
ARGBEGIN {
case '6':
proto = &v6pr;
break;
case 'a':
addresses = 1;
break;
case 'd':
debug++;
break;
case 'f':
flood = 1;
break;
case 'i':
interval = atoi(EARGF(usage()));
if(interval < 0)
usage();
break;
case 'l':
lostonly++;
break;
case 'n':
nmsg = atoi(EARGF(usage()));
if(nmsg < 0)
usage();
break;
case 'q':
quiet = 1;
break;
case 'r':
rint = 1;
break;
case 's':
msglen = atoi(EARGF(usage()));
break;
case 'w':
waittime = atoi(EARGF(usage()));
if(waittime < 0)
usage();
break;
default:
usage();
break;
} ARGEND;
if(msglen < proto->iphdrsz + ICMP_HDRSIZE)
msglen = proto->iphdrsz + ICMP_HDRSIZE;
if(msglen < 64)
msglen = 64;
if(msglen >= 64*1024)
msglen = 64*1024-1;
if(interval <= 0 && !flood)
interval = SLEEPMS;
if(argc < 1)
usage();
notify(catch);
if (!isv4name(argv[0]))
proto = &v6pr;
ds = netmkaddr(argv[0], proto->net, "1");
fd = dial(ds, 0, 0, 0);
if(fd < 0){
fprint(2, "%s: couldn't dial %s: %r\n", argv0, ds);
exits("dialing");
}
if (!quiet)
print("sending %d %d byte messages %d ms apart to %s\n",
nmsg, msglen, interval, ds);
switch(rfork(RFPROC|RFMEM|RFFDG)){
case -1:
fprint(2, "%s: can't fork: %r\n", argv0);
exits("forking");
case 0:
rcvr(fd, msglen, interval, nmsg);
exits(0);
default:
sender(fd, msglen, interval, nmsg);
wait();
exits(lostmsgs ? "lost messages" : "");
}
}
void
reply(Req *r, void *v)
{
r->rtt /= 1000LL;
sum += r->rtt;
if(!r->replied)
rcvdmsgs++;
if(!quiet && !lostonly)
if(addresses)
(*proto->prreply)(r, v);
else
print("%ud: rtt %lld µs, avg rtt %lld µs, ttl = %d\n",
r->seq - firstseq, r->rtt, sum/rcvdmsgs, r->ttl);
r->replied = 1;
}
void
lost(Req *r, void *v)
{
if(!quiet)
if(addresses && v != nil)
(*proto->prlost)(r->seq - firstseq, v);
else
print("lost %ud\n", r->seq - firstseq);
lostmsgs++;
}