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udpbench.c
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udpbench.c
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/*
* Copyright (c) 2019-2024 Alexander Bluhm <[email protected]>
* Copyright (c) 2022 Moritz Buhl <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/udp.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
sig_atomic_t alarm_signaled;
const char *progname, *hostname, *service = "12345", *remotessh;
int divert, hopbyhop, sendmode;
int delay, idle = 1, timeout = 1;
long long bitrate;
int buffersize, mmsglen, repeat;
size_t udplength;
long packetrate;
char status_line[1024];
const char *pseudo = "none";
void udp_connect_send(struct timeval *, struct timeval *);
void udp_bind_receive(struct timeval *, struct timeval *, struct timeval *);
void udp_socket_fork(int *,
int(*)(int, struct sockaddr *, socklen_t *),
int(*)(int, const struct sockaddr *, socklen_t));
int udp_socket_wait(int, pid_t, FILE *);
void alarm_handler(int);
int udp_bind(int *, const char *, const char *);
int udp_connect(int *, const char *, const char *);
void udp_getsockname(int, char *, char *);
void udp_setbuffersize(int, int, int);
void udp_setrouteralert(int);
void udp_send(int, int, unsigned long);
void udp_receive(int, int, struct timeval *);
struct mmsghdr *mmsg_alloc(int, size_t, int);
void mmsg_free(struct mmsghdr *);
void status_init(const char *, unsigned long, unsigned long, unsigned long,
int, const struct timeval *, const struct timeval *);
void status_final(const struct timeval *, const struct timeval *);
unsigned long udp2iplength(unsigned long, int, unsigned long *);
unsigned long udp2etherlength(unsigned long , int);
pid_t ssh_bind(FILE **, const char *, const char *);
pid_t ssh_connect(FILE **, const char *, const char *);
pid_t ssh_pipe(FILE **, char **);
void ssh_getpeername(FILE *, char *, char *);
void ssh_wait(pid_t, FILE *);
static void
usage(void)
{
fprintf(stderr, "usage: udpbench [-DH] [-B bitrate] [-b bufsize] "
"[-C pseudo] [-d delay] [-i idle] [-l length] [-m mmsglen] "
"[-N repeat] [-P packetrate] [-p port] [-R remoteprog] "
"[-r remotessh] [-t timeout] send|recv [hostname]\n"
" -B bitrate bits per seconds send rate\n"
" -b bufsize set size of send or receive buffer\n"
" -C pseudo pseudo network device changes packet length\n"
" -D use pf divert packet for receive\n"
" -d delay wait for setup before sending\n"
" -H send hop-by-hop router alert option\n"
" -i idle idle timeout before receiving stops, "
"default 1\n"
" -l length set length of udp payload\n"
" -m mmsglen number of mmsghdr for sendmmsg or recvmmsg\n"
" -N repeat run parallel process with incremented address\n"
" -P packetrate packets per second send rate\n"
" -p port udp port, default 12345, random 0\n"
" -R remoteprog path of udpbench tool on remote side\n"
" -r remotessh ssh host to start udpbench on remote side\n"
" -t timeout send duration or receive timeout, default 1\n"
" send|recv send or receive mode for local side\n"
" hostname address of receiving side\n"
);
exit(2);
}
int
main(int argc, char *argv[])
{
struct sigaction act;
struct timeval start, stop, final;
const char *errstr;
int ch;
progname = argv[0];
if (setvbuf(stdout, NULL, _IOLBF, 0) != 0)
err(1, "setvbuf");
while ((ch = getopt(argc, argv, "B:b:C:Dd:Hi:l:m:N:P:p:R:r:t:"))
!= -1) {
switch (ch) {
case 'B':
bitrate = strtonum(optarg, 0, LLONG_MAX, &errstr);
if (errstr != NULL)
errx(1, "bits per second rate is %s: %s",
errstr, optarg);
break;
case 'b':
buffersize = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr != NULL)
errx(1, "buffer size is %s: %s",
errstr, optarg);
break;
case 'C':
pseudo = optarg;
break;
case 'D':
divert = 1;
break;
case 'd':
delay = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr != NULL)
errx(1, "delay is %s: %s",
errstr, optarg);
break;
case 'H':
hopbyhop = 1;
break;
case 'i':
idle = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr != NULL)
errx(1, "idle is %s: %s",
errstr, optarg);
break;
case 'l':
udplength = strtonum(optarg, 0, IP_MAXPACKET, &errstr);
if (errstr != NULL)
errx(1, "payload length is %s: %s",
errstr, optarg);
break;
case 'm':
mmsglen = strtonum(optarg, 0, 1024, &errstr);
if (errstr != NULL)
errx(1, "msghdr size is %s: %s",
errstr, optarg);
break;
case 'N':
repeat = strtonum(optarg, 0, 256, &errstr);
if (errstr != NULL)
errx(1, "repeat number is %s: %s",
errstr, optarg);
break;
case 'P':
packetrate = strtonum(optarg, 0, LONG_MAX, &errstr);
if (errstr != NULL)
errx(1, "packets per second rate is %s: %s",
errstr, optarg);
break;
case 'p':
service = optarg;
break;
case 'R':
progname = optarg;
break;
case 'r':
remotessh = optarg;
break;
case 't':
timeout = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr != NULL)
errx(1, "timeout is %s: %s",
errstr, optarg);
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc > 2)
usage();
if (argc < 1)
errx(1, "send or recv required");
if (strcmp(argv[0], "send") == 0) {
sendmode = 1;
setprogname("udpbench send");
} else if (strcmp(argv[0], "recv") == 0) {
sendmode = 0;
setprogname("udpbench recv");
} else
errx(1, "bad send or recv: %s", argv[0]);
if (sendmode && argc < 2)
errx(1, "hostname required for send");
if (argc >= 2)
hostname = argv[1];
if (bitrate && packetrate)
errx(1, "either bitrate or packetrate may be given");
#ifdef __OpenBSD__
if (sendmode && hopbyhop) {
;
} else if (remotessh != NULL) {
if (pledge("stdio dns inet proc exec", NULL) == -1)
err(1, "pledge");
} else if (repeat) {
if (pledge("stdio dns inet proc", NULL) == -1)
err(1, "pledge");
} else {
if (pledge("stdio dns inet", NULL) == -1)
err(1, "pledge");
}
#endif
memset(&act, 0, sizeof(act));
act.sa_handler = alarm_handler;
act.sa_flags = SA_RESETHAND;
if (sigaction(SIGALRM, &act, NULL) == -1)
err(1, "sigaction");
timerclear(&start);
timerclear(&stop);
timerclear(&final);
if (sendmode)
udp_connect_send(&start, &stop);
else
udp_bind_receive(&start, &stop, &final);
if (timerisset(&stop)) {
status_final(&start, &stop);
if (!sendmode && idle && final.tv_sec < idle) {
errx(1, "not enough idle time: %lld.%06ld",
(long long)final.tv_sec, final.tv_usec);
}
}
return 0;
}
void
udp_connect_send(struct timeval *start, struct timeval *stop)
{
const char *remotehost, *remoteserv;
char localaddr[NI_MAXHOST], localport[NI_MAXSERV];
long sendrate;
int udp_socket, udp_family = AF_UNSPEC;
FILE *ssh_stream;
pid_t ssh_pid;
remotehost = hostname;
remoteserv = service;
if (remotessh != NULL) {
char remoteaddr[NI_MAXHOST], remoteport[NI_MAXSERV];
ssh_pid = ssh_bind(&ssh_stream, remotehost, remoteserv);
#ifdef __OpenBSD__
if (hopbyhop) {
;
} else if (repeat) {
if (pledge("stdio dns inet proc", NULL) == -1)
err(1, "pledge");
} else {
if (pledge("stdio dns inet", NULL) == -1)
err(1, "pledge");
}
#endif
ssh_getpeername(ssh_stream, remoteaddr, remoteport);
if (!divert) {
remotehost = remoteaddr;
remoteserv = remoteport;
}
}
udp_socket = udp_connect(&udp_family, remotehost, remoteserv);
if (gettimeofday(start, NULL) == -1)
err(1, "gettimeofday start");
udp_getsockname(udp_socket, localaddr, localport);
if (repeat > 0) {
udp_socket_fork(&udp_socket, getpeername, connect);
if (gettimeofday(start, NULL) == -1)
err(1, "gettimeofday start");
if (udp_socket_wait(udp_socket, ssh_pid, ssh_stream))
return;
}
if (buffersize)
udp_setbuffersize(udp_socket, SO_SNDBUF, buffersize);
if (hopbyhop) {
if (udp_family != AF_INET6)
errx(1, "hopbyhop only allowed with IPv6");
udp_setrouteralert(udp_socket);
#ifdef __OpenBSD__
if (pledge("stdio dns inet", NULL) == -1)
err(1, "pledge");
#endif
}
if (bitrate) {
unsigned long etherlen;
etherlen = udp2etherlength(udplength, udp_family);
sendrate = bitrate / 8 / etherlen;
if (sendrate == 0)
errx(1, "bitrate %llu too small for ether %lu",
bitrate, etherlen);
} else
sendrate = packetrate;
if (delay) {
if (send(udp_socket, "", 0, 0) == -1)
err(1, "send initial");
sleep(delay);
}
if (timeout > 0)
alarm(timeout);
udp_send(udp_socket, udp_family, sendrate);
if (gettimeofday(stop, NULL) == -1)
err(1, "gettimeofday stop");
if (close(udp_socket) == -1)
err(1, "close");
if (repeat == 0 && remotessh != NULL)
ssh_wait(ssh_pid, ssh_stream);
}
void
udp_bind_receive(struct timeval *start, struct timeval *stop,
struct timeval *final)
{
const char *localhost, *localserv;
char localaddr[NI_MAXHOST], localport[NI_MAXSERV];
int udp_socket, udp_family = AF_UNSPEC;
FILE *ssh_stream;
pid_t ssh_pid;
localhost = hostname;
localserv = service;
udp_socket = udp_bind(&udp_family, localhost, localserv);
if (gettimeofday(start, NULL) == -1)
err(1, "gettimeofday start");
udp_getsockname(udp_socket, localaddr, localport);
if (!divert) {
localhost = localaddr;
localserv = localport;
}
if (repeat > 0) {
udp_socket_fork(&udp_socket, getsockname, bind);
if (gettimeofday(start, NULL) == -1)
err(1, "gettimeofday start");
}
if ((repeat == 0 || udp_socket == -1) && remotessh != NULL) {
char remoteaddr[NI_MAXHOST], remoteport[NI_MAXSERV];
ssh_pid = ssh_connect(&ssh_stream, localhost, localserv);
#ifdef __OpenBSD__
if (repeat) {
if (pledge("stdio dns inet proc", NULL) == -1)
err(1, "pledge");
} else {
if (pledge("stdio dns inet", NULL) == -1)
err(1, "pledge");
}
#endif
ssh_getpeername(ssh_stream, remoteaddr, remoteport);
}
if (repeat > 0) {
if (udp_socket_wait(udp_socket, ssh_pid, ssh_stream))
return;
}
if (buffersize)
udp_setbuffersize(udp_socket, SO_RCVBUF, buffersize);
if (timeout > 0)
alarm(timeout + delay + idle + 1);
udp_receive(udp_socket, udp_family, final);
if (gettimeofday(stop, NULL) == -1)
err(1, "gettimeofday stop");
if (close(udp_socket) == -1)
err(1, "close");
if (repeat == 0 && remotessh != NULL)
ssh_wait(ssh_pid, ssh_stream);
}
void
udp_socket_fork(int *udp_socket,
int(*getname)(int, struct sockaddr *, socklen_t *),
int(*setname)(int, const struct sockaddr *, socklen_t))
{
char localaddr[NI_MAXHOST], localport[NI_MAXSERV];
struct sockaddr_storage ss;
socklen_t sslen;
int n;
sslen = sizeof(ss);
if (getname(*udp_socket, (struct sockaddr *)&ss, &sslen) == -1)
err(1, "getname");
for (n = repeat; n > 0; n--) {
switch (fork()) {
case -1:
err(1, "fork");
default:
/* parent */
if (close(*udp_socket) == -1)
err(1, "close %d", n);
*udp_socket = -1;
if (n == 1)
break;
switch (ss.ss_family) {
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
case AF_INET:
sin = (struct sockaddr_in *)&ss;
((uint8_t *)&sin->sin_addr.s_addr)[3]++;
break;
case AF_INET6:
sin6 = (struct sockaddr_in6 *)&ss;
((uint8_t *)&sin6->sin6_addr.s6_addr)[15]++;
break;
}
*udp_socket = socket(ss.ss_family, SOCK_DGRAM,
IPPROTO_UDP);
if (*udp_socket == -1)
err(1, "socket %d", n);
if (setname(*udp_socket, (struct sockaddr *)&ss, sslen)
== -1)
err(1, "setname %d", n);
udp_getsockname(*udp_socket, localaddr, localport);
break;
case 0:
/* child */
#ifdef __OpenBSD__
if (pledge("stdio dns inet", NULL) == -1)
err(1, "pledge");
#endif
{
static char name[32];
snprintf(name, sizeof(name), "udpbench %s %d",
sendmode ? "send" : "recv", repeat - n);
setprogname(name);
}
n = 0;
break;
}
}
}
int
udp_socket_wait(int udp_socket, pid_t ssh_pid, FILE *ssh_stream)
{
int n;
if (udp_socket != -1)
return 0;
if (remotessh != NULL) {
for (n = repeat; n > 1; n--) {
char remoteaddr[NI_MAXHOST], remoteport[NI_MAXSERV];
ssh_getpeername(ssh_stream, remoteaddr, remoteport);
}
ssh_wait(ssh_pid, ssh_stream);
}
for (n = repeat; n > 0; n--) {
int status;
if (wait(&status) == -1)
err(1, "wait");
if (status != 0)
errx(1, "status: %d", status);
}
return 1;
}
void
alarm_handler(int sig)
{
alarm_signaled = 1;
}
int
udp_bind(int *udp_family, const char *host, const char *serv)
{
struct addrinfo hints, *res, *res0;
int error, udp_socket;
int save_errno;
const char *cause = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_family = *udp_family;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
hints.ai_flags = AI_PASSIVE;
error = getaddrinfo(host, serv, &hints, &res0);
if (error)
errx(1, "getaddrinfo: %s", gai_strerror(error));
udp_socket = -1;
for (res = res0; res; res = res->ai_next) {
if (divert) {
/* pf divert packet uses raw socket */
res->ai_socktype = SOCK_RAW;
#ifdef IPPROTO_DIVERT
res->ai_protocol = IPPROTO_DIVERT;
#else
errx(1, "IPPROTO_DIVERT not defined");
#endif
}
udp_socket = socket(res->ai_family, res->ai_socktype,
res->ai_protocol);
if (udp_socket == -1) {
cause = "socket";
continue;
}
if (divert) {
/* divert packet socket is bound to port only */
if (res->ai_family == AF_INET) {
struct sockaddr_in *sin;
sin = (struct sockaddr_in *)res->ai_addr;
memset(&sin->sin_addr, 0,
sizeof(struct in_addr));
if (sin->sin_port == 0)
errx(1, "divert needs bind port");
}
if (res->ai_family == AF_INET) {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)res->ai_addr;
memset(&sin6->sin6_addr, 0,
sizeof(struct in6_addr));
if (sin6->sin6_port == 0)
errx(1, "divert needs bind port");
}
}
if (bind(udp_socket, res->ai_addr, res->ai_addrlen) == -1) {
cause = "bind";
save_errno = errno;
close(udp_socket);
errno = save_errno;
udp_socket = -1;
continue;
}
break; /* okay we got one */
}
if (udp_socket == -1)
err(1, "%s", cause);
*udp_family = res->ai_family;
freeaddrinfo(res0);
return udp_socket;
}
int
udp_connect(int *udp_family, const char *host, const char *serv)
{
struct addrinfo hints, *res, *res0;
int error, udp_socket;
int save_errno;
const char *cause = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_family = *udp_family;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
error = getaddrinfo(host, serv, &hints, &res0);
if (error)
errx(1, "getaddrinfo: %s", gai_strerror(error));
udp_socket = -1;
for (res = res0; res; res = res->ai_next) {
udp_socket = socket(res->ai_family, res->ai_socktype,
res->ai_protocol);
if (udp_socket == -1) {
cause = "socket";
continue;
}
if (connect(udp_socket, res->ai_addr, res->ai_addrlen) == -1) {
cause = "connect";
save_errno = errno;
close(udp_socket);
errno = save_errno;
udp_socket = -1;
continue;
}
break; /* okay we got one */
}
if (udp_socket == -1)
err(1, "%s", cause);
*udp_family = res->ai_family;
freeaddrinfo(res0);
return udp_socket;
}
void
udp_getsockname(int udp_socket, char *addr, char *port)
{
struct sockaddr_storage ss;
socklen_t sslen;
int error;
sslen = sizeof(ss);
if (getsockname(udp_socket, (struct sockaddr *)&ss, &sslen) == -1)
err(1, "getsockname");
error = getnameinfo((struct sockaddr *)&ss, sslen, addr, NI_MAXHOST,
port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV | NI_DGRAM);
if (error)
errx(1, "getnameinfo: %s", gai_strerror(error));
printf("sockname: %s %s\n", addr, port);
}
void
udp_setbuffersize(int udp_socket, int name, int size)
{
socklen_t len;
len = sizeof(size);
if (setsockopt(udp_socket, SOL_SOCKET, name, &size, len) == -1)
err(1, "setsockopt buffer size %d", size);
}
void
udp_setrouteralert(int udp_socket)
{
struct {
struct ip6_hbh hbh;
struct ip6_opt_router ra;
u_char pad[2];
} opts;
socklen_t len;
opts.hbh.ip6h_nxt = IPPROTO_UDP;
opts.hbh.ip6h_len = (sizeof(opts) - 1) / 8;
opts.ra.ip6or_type = IP6OPT_ROUTER_ALERT;
opts.ra.ip6or_len = sizeof(opts.ra) - 2;
*(uint16_t *)opts.ra.ip6or_value = IP6_ALERT_AN;
opts.pad[0] = IP6OPT_PAD1;
opts.pad[1] = IP6OPT_PAD1;
len = sizeof(opts);
if (setsockopt(udp_socket, IPPROTO_IPV6, IPV6_HOPOPTS, &opts, len)
== -1)
err(1, "setsockopt router alert");
}
struct mmsghdr *
mmsg_alloc(int packets, size_t paylen, int fill)
{
struct mmsghdr *mmsg, *mhdr;
struct iovec *iov;
char *payload;
if ((mmsg = calloc(packets, sizeof(struct mmsghdr))) == NULL)
err(1, "calloc mmsghdr");
if ((iov = calloc(packets, sizeof(struct iovec))) == NULL)
err(1, "calloc iovec");
if ((payload = calloc(packets, paylen)) == NULL)
err(1, "calloc payload");
if (fill)
arc4random_buf(payload, packets * paylen);
mhdr = mmsg;
while (packets > 0) {
mhdr->msg_hdr.msg_iov = iov;
mhdr->msg_hdr.msg_iovlen = 1;
iov->iov_base = payload;
iov->iov_len = paylen;
mhdr++;
iov++;
payload += paylen;
packets--;
}
return mmsg;
}
void
mmsg_free(struct mmsghdr *mmsg)
{
free(mmsg->msg_hdr.msg_iov->iov_base);
free(mmsg->msg_hdr.msg_iov);
free(mmsg);
}
void
udp_send(int udp_socket, int udp_family, unsigned long sendrate)
{
struct timeval begin, end, duration;
struct timespec wait;
unsigned long syscall, packet;
struct mmsghdr *mmsg;
char *payload;
size_t udplen;
ssize_t sndlen;
int pkts;
udplen = udplength;
if (mmsglen) {
mmsg = mmsg_alloc(mmsglen, udplen, 1);
} else {
pkts = 1;
if ((payload = malloc(udplen)) == NULL)
err(1, "malloc payload");
arc4random_buf(payload, udplen);
}
if (gettimeofday(&begin, NULL) == -1)
err(1, "gettimeofday begin");
timerclear(&end);
syscall = 0;
packet = 0;
sndlen = 0;
while (!alarm_signaled) {
syscall++;
if (mmsglen)
pkts = sendmmsg(udp_socket, mmsg, mmsglen, 0);
else
sndlen = send(udp_socket, payload, udplen, 0);
if (pkts == -1 || sndlen == -1) {
if (errno == ENOBUFS || errno == EINTR)
continue;
err(1, "send");
}
packet += pkts;
if (sendrate) {
double expectduration, waittime;
if (!timerisset(&end)) {
if (gettimeofday(&end, NULL) == -1)
err(1, "gettimeofday rate before");
}
timersub(&end, &begin, &duration);
if (!timerisset(&duration))
duration.tv_usec = 1;
expectduration = (double)packet / (double)sendrate;
waittime = expectduration - (double)duration.tv_sec -
(double)duration.tv_usec / 1000000.;
wait.tv_sec = waittime;
wait.tv_nsec = (waittime - (double)wait.tv_sec) *
1000000000.;
if (wait.tv_sec > 0 || wait.tv_nsec > 0) {
nanosleep(&wait, NULL);
if (gettimeofday(&end, NULL) == -1)
err(1, "gettimeofday rate after");
}
}
}
if (gettimeofday(&end, NULL) == -1)
err(1, "gettimeofday end");
status_init("send", syscall, packet, udplen, udp_family, &begin, &end);
if (mmsglen)
mmsg_free(mmsg);
else
free(payload);
}
void
udp_receive(int udp_socket, int udp_family, struct timeval *final)
{
struct timeval begin, end, timeo;
unsigned long syscall, packet;
unsigned long headerlen, paylen;
long bored;
struct mmsghdr *mmsg;
char *payload;
size_t udplen;
ssize_t rcvlen;
socklen_t len;
int pkts;
udplen = udplength;
if (divert) {
headerlen = sizeof(struct udphdr);
if (udp_family == AF_INET)
headerlen += sizeof(struct ip);
if (udp_family == AF_INET6)
headerlen += sizeof(struct ip6_hdr);
udplen += headerlen;
}
if (mmsglen)
mmsg = mmsg_alloc(mmsglen, udplen + 1, 0);
else
pkts = 1;
if ((payload = malloc(udplen + 1)) == NULL)
err(1, "malloc payload");
if (delay) {
/* before the delay expect an empty initial packet */
rcvlen = recv(udp_socket, payload, udplen + 1, 0);
if (rcvlen == -1)
err(1, "recv initial");
if (rcvlen > 0)
warnx("receive initial packet not empty %zd", rcvlen);
}
/* wait for the first packet to start timing */
rcvlen = recv(udp_socket, payload, udplen + 1, 0);
if (rcvlen == -1)
err(1, "recv first");
paylen = rcvlen;
if (paylen < udplen)
warnx("receive packet truncated %zd", rcvlen);
if (paylen > udplen)
warnx("receive packet oversized %zd", rcvlen);
if (divert) {
if (paylen < headerlen)
errx(1, "receive length %zd too short for header",
rcvlen);
paylen -= headerlen;
}
if (gettimeofday(&begin, NULL) == -1)
err(1, "gettimeofday begin");
timerclear(final);
timerclear(&timeo);
timeo.tv_usec = 100000;
len = sizeof(timeo);
if (setsockopt(udp_socket, SOL_SOCKET, SO_RCVTIMEO, &timeo, len) == -1)
err(1, "setsockopt recv timeout");
syscall = 1;
packet = 1;
bored = 0;
while (!alarm_signaled) {
syscall++;
if (mmsglen)
pkts = recvmmsg(udp_socket, mmsg, mmsglen, 0, NULL);
else
rcvlen = recv(udp_socket, payload, udplen + 1, 0);
if (pkts == -1 || rcvlen == -1) {
if (errno == EWOULDBLOCK) {
bored++;
if (bored == 1) {
if (gettimeofday(final, NULL) == -1)
err(1, "gettimeofday final");
/* packet was seen before timeout */
timersub(final, &timeo, final);
}
if (idle && bored * timeo.tv_usec >
1000000L * idle ) {
/* more than a second idle time */
break;
}
continue;
}
if (errno == EINTR)
continue;
err(1, "recv");
}
timerclear(final);
bored = 0;
packet += pkts;
}
if (gettimeofday(&end, NULL) == -1)
err(1, "gettimeofday end");
if (timerisset(final)) {
struct timeval tmp;
tmp = end;
/* last packet was seen at final time */
end = *final;
/* new final is duration without packets */
timersub(&tmp, final, final);
}
status_init("recv", syscall, packet, paylen, udp_family, &begin, &end);
if (mmsglen)
mmsg_free(mmsg);
free(payload);
}
void
status_init(const char *action, unsigned long syscall, unsigned long packet,
unsigned long paylen, int af, const struct timeval *begin,
const struct timeval *end)
{
struct timeval duration;
unsigned long frame, iplen, etherlen;
double bits;
iplen = udp2iplength(paylen, af, &frame);
etherlen = udp2etherlength(paylen, af);
bits = (double)packet * etherlen * 8;
timersub(end, begin, &duration);
bits /= (double)duration.tv_sec + (double)duration.tv_usec / 1000000;
snprintf(status_line, sizeof(status_line),
"%s: syscalls %lu, packets %lu, "
"frame %lu, payload %lu, ip %lu, ether %lu, "
"begin %lld.%06ld, end %lld.%06ld, "
"duration %lld.%06ld, bit/s %e",
action, syscall, packet, frame, paylen, iplen, etherlen,
(long long)begin->tv_sec, begin->tv_usec,
(long long)end->tv_sec, end->tv_usec,
(long long)duration.tv_sec, duration.tv_usec, bits);
}
void
status_final(const struct timeval *start, const struct timeval *stop)
{
size_t len;
len = strlen(status_line);
if (len >= sizeof(status_line))
return;
snprintf(status_line + len, sizeof(status_line) - len,
", start %lld.%06ld, stop %lld.%06ld\n",
(long long)start->tv_sec, start->tv_usec,
(long long)stop->tv_sec, stop->tv_usec);
len = strlen(status_line);
fflush(stdout);
fwrite(status_line, len, 1, stdout);
fflush(stdout);
}
unsigned long
udp2iplength(unsigned long payload, int af, unsigned long *packets)
{
unsigned long iplength = 0;
/* encapsulate IP in IP */
if (strcmp(pseudo, "gif") == 0)
iplength += 20;
if (strcmp(pseudo, "gif6") == 0)
iplength += 40;
if (strcmp(pseudo, "gre") == 0)
iplength += 20 + 8;
/* IPv4 header */
if (af == AF_INET)
iplength += 20;
/* IPv6 header */
if (af == AF_INET6)
iplength += 40;
/* UDP header, payload */
iplength += 8 + payload;
/* maximum ethernet payload */
if (iplength > 1500) {
if (af == AF_INET) {
/* length without IPv4 header, align to fragment */
*packets = (iplength - 20) / ((1500 - 20) & ~7);
/* final fragment */
iplength = (iplength - 20) % ((1500 - 20) & ~7);
if (iplength == 0) {
/* full sized fragments */
iplength = *packets * (((1500 - 20) & ~7) + 20);
} else {
/* final fragment header, full fragments */
iplength += 20 +
(*packets * (((1500 - 20) & ~7) + 20));
++*packets;
}
}
if (af == AF_INET6) {
/* length without IPv6, fragement header, alignment */
*packets = (iplength - 40) / ((1500 - 40 - 8) & ~7);
/* final fragment */
iplength = (iplength - 40) % ((1500 - 40 - 8) & ~7);
if (iplength == 0) {
/* full sized fragments */
iplength = *packets * (1500 & ~7);
} else {
/* final fragment header, full fragments */
iplength += 40 + 8 + (*packets * (1500 & ~7));
++*packets;
}
}
} else
*packets = 1;