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linux/tools/testing/selftests/net/nettest.c

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// SPDX-License-Identifier: GPL-2.0
/* nettest - used for functional tests of networking APIs
*
* Copyright (c) 2013-2019 David Ahern <dsahern@gmail.com>. All rights reserved.
*/
#define _GNU_SOURCE
#include <features.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <linux/tcp.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <sched.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#ifndef IPV6_UNICAST_IF
#define IPV6_UNICAST_IF 76
#endif
#ifndef IPV6_MULTICAST_IF
#define IPV6_MULTICAST_IF 17
#endif
#define DEFAULT_PORT 12345
#define NS_PREFIX "/run/netns/"
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
struct sock_args {
/* local address */
const char *local_addr_str;
const char *client_local_addr_str;
union {
struct in_addr in;
struct in6_addr in6;
} local_addr;
/* remote address */
const char *remote_addr_str;
union {
struct in_addr in;
struct in6_addr in6;
} remote_addr;
int scope_id; /* remote scope; v6 send only */
struct in_addr grp; /* multicast group */
unsigned int has_local_ip:1,
has_remote_ip:1,
has_grp:1,
has_expected_laddr:1,
has_expected_raddr:1,
bind_test_only:1;
unsigned short port;
int type; /* DGRAM, STREAM, RAW */
int protocol;
int version; /* AF_INET/AF_INET6 */
int use_setsockopt;
int use_cmsg;
const char *dev;
const char *server_dev;
int ifindex;
const char *clientns;
const char *serverns;
const char *password;
const char *client_pw;
/* prefix for MD5 password */
const char *md5_prefix_str;
union {
struct sockaddr_in v4;
struct sockaddr_in6 v6;
} md5_prefix;
unsigned int prefix_len;
/* expected addresses and device index for connection */
const char *expected_dev;
const char *expected_server_dev;
int expected_ifindex;
/* local address */
const char *expected_laddr_str;
union {
struct in_addr in;
struct in6_addr in6;
} expected_laddr;
/* remote address */
const char *expected_raddr_str;
union {
struct in_addr in;
struct in6_addr in6;
} expected_raddr;
};
static int server_mode;
static unsigned int prog_timeout = 5;
static unsigned int interactive;
static int iter = 1;
static char *msg = "Hello world!";
static int msglen;
static int quiet;
static int try_broadcast = 1;
static char *timestamp(char *timebuf, int buflen)
{
time_t now;
now = time(NULL);
if (strftime(timebuf, buflen, "%T", localtime(&now)) == 0) {
memset(timebuf, 0, buflen);
strncpy(timebuf, "00:00:00", buflen-1);
}
return timebuf;
}
static void log_msg(const char *format, ...)
{
char timebuf[64];
va_list args;
if (quiet)
return;
fprintf(stdout, "%s %s:",
timestamp(timebuf, sizeof(timebuf)),
server_mode ? "server" : "client");
va_start(args, format);
vfprintf(stdout, format, args);
va_end(args);
fflush(stdout);
}
static void log_error(const char *format, ...)
{
char timebuf[64];
va_list args;
if (quiet)
return;
fprintf(stderr, "%s %s:",
timestamp(timebuf, sizeof(timebuf)),
server_mode ? "server" : "client");
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fflush(stderr);
}
static void log_err_errno(const char *fmt, ...)
{
char timebuf[64];
va_list args;
if (quiet)
return;
fprintf(stderr, "%s %s: ",
timestamp(timebuf, sizeof(timebuf)),
server_mode ? "server" : "client");
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fprintf(stderr, ": %d: %s\n", errno, strerror(errno));
fflush(stderr);
}
static void log_address(const char *desc, struct sockaddr *sa)
{
char addrstr[64];
if (quiet)
return;
if (sa->sa_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *) sa;
log_msg("%s %s:%d\n",
desc,
inet_ntop(AF_INET, &s->sin_addr, addrstr,
sizeof(addrstr)),
ntohs(s->sin_port));
} else if (sa->sa_family == AF_INET6) {
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) sa;
log_msg("%s [%s]:%d\n",
desc,
inet_ntop(AF_INET6, &s6->sin6_addr, addrstr,
sizeof(addrstr)),
ntohs(s6->sin6_port));
}
fflush(stdout);
}
static int switch_ns(const char *ns)
{
char path[PATH_MAX];
int fd, ret;
if (geteuid())
log_error("warning: likely need root to set netns %s!\n", ns);
snprintf(path, sizeof(path), "%s%s", NS_PREFIX, ns);
fd = open(path, 0);
if (fd < 0) {
log_err_errno("Failed to open netns path; can not switch netns");
return 1;
}
ret = setns(fd, CLONE_NEWNET);
close(fd);
return ret;
}
static int tcp_md5sig(int sd, void *addr, socklen_t alen, struct sock_args *args)
{
int keylen = strlen(args->password);
struct tcp_md5sig md5sig = {};
int opt = TCP_MD5SIG;
int rc;
md5sig.tcpm_keylen = keylen;
memcpy(md5sig.tcpm_key, args->password, keylen);
if (args->prefix_len) {
opt = TCP_MD5SIG_EXT;
md5sig.tcpm_flags |= TCP_MD5SIG_FLAG_PREFIX;
md5sig.tcpm_prefixlen = args->prefix_len;
addr = &args->md5_prefix;
}
memcpy(&md5sig.tcpm_addr, addr, alen);
if (args->ifindex) {
opt = TCP_MD5SIG_EXT;
md5sig.tcpm_flags |= TCP_MD5SIG_FLAG_IFINDEX;
md5sig.tcpm_ifindex = args->ifindex;
}
rc = setsockopt(sd, IPPROTO_TCP, opt, &md5sig, sizeof(md5sig));
if (rc < 0) {
/* ENOENT is harmless. Returned when a password is cleared */
if (errno == ENOENT)
rc = 0;
else
log_err_errno("setsockopt(TCP_MD5SIG)");
}
return rc;
}
static int tcp_md5_remote(int sd, struct sock_args *args)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
};
struct sockaddr_in6 sin6 = {
.sin6_family = AF_INET6,
};
void *addr;
int alen;
switch (args->version) {
case AF_INET:
sin.sin_port = htons(args->port);
sin.sin_addr = args->md5_prefix.v4.sin_addr;
addr = &sin;
alen = sizeof(sin);
break;
case AF_INET6:
sin6.sin6_port = htons(args->port);
sin6.sin6_addr = args->md5_prefix.v6.sin6_addr;
addr = &sin6;
alen = sizeof(sin6);
break;
default:
log_error("unknown address family\n");
exit(1);
}
if (tcp_md5sig(sd, addr, alen, args))
return -1;
return 0;
}
static int get_ifidx(const char *ifname)
{
struct ifreq ifdata;
int sd, rc;
if (!ifname || *ifname == '\0')
return -1;
memset(&ifdata, 0, sizeof(ifdata));
strcpy(ifdata.ifr_name, ifname);
sd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
if (sd < 0) {
log_err_errno("socket failed");
return -1;
}
rc = ioctl(sd, SIOCGIFINDEX, (char *)&ifdata);
close(sd);
if (rc != 0) {
log_err_errno("ioctl(SIOCGIFINDEX) failed");
return -1;
}
return ifdata.ifr_ifindex;
}
static int bind_to_device(int sd, const char *name)
{
int rc;
rc = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, name, strlen(name)+1);
if (rc < 0)
log_err_errno("setsockopt(SO_BINDTODEVICE)");
return rc;
}
static int get_bind_to_device(int sd, char *name, size_t len)
{
int rc;
socklen_t optlen = len;
name[0] = '\0';
rc = getsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, name, &optlen);
if (rc < 0)
log_err_errno("setsockopt(SO_BINDTODEVICE)");
return rc;
}
static int check_device(int sd, struct sock_args *args)
{
int ifindex = 0;
char name[32];
if (get_bind_to_device(sd, name, sizeof(name)))
*name = '\0';
else
ifindex = get_ifidx(name);
log_msg(" bound to device %s/%d\n",
*name ? name : "<none>", ifindex);
if (!args->expected_ifindex)
return 0;
if (args->expected_ifindex != ifindex) {
log_error("Device index mismatch: expected %d have %d\n",
args->expected_ifindex, ifindex);
return 1;
}
log_msg("Device index matches: expected %d have %d\n",
args->expected_ifindex, ifindex);
return 0;
}
static int set_pktinfo_v4(int sd)
{
int one = 1;
int rc;
rc = setsockopt(sd, SOL_IP, IP_PKTINFO, &one, sizeof(one));
if (rc < 0 && rc != -ENOTSUP)
log_err_errno("setsockopt(IP_PKTINFO)");
return rc;
}
static int set_recvpktinfo_v6(int sd)
{
int one = 1;
int rc;
rc = setsockopt(sd, SOL_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
if (rc < 0 && rc != -ENOTSUP)
log_err_errno("setsockopt(IPV6_RECVPKTINFO)");
return rc;
}
static int set_recverr_v4(int sd)
{
int one = 1;
int rc;
rc = setsockopt(sd, SOL_IP, IP_RECVERR, &one, sizeof(one));
if (rc < 0 && rc != -ENOTSUP)
log_err_errno("setsockopt(IP_RECVERR)");
return rc;
}
static int set_recverr_v6(int sd)
{
int one = 1;
int rc;
rc = setsockopt(sd, SOL_IPV6, IPV6_RECVERR, &one, sizeof(one));
if (rc < 0 && rc != -ENOTSUP)
log_err_errno("setsockopt(IPV6_RECVERR)");
return rc;
}
static int set_unicast_if(int sd, int ifindex, int version)
{
int opt = IP_UNICAST_IF;
int level = SOL_IP;
int rc;
ifindex = htonl(ifindex);
if (version == AF_INET6) {
opt = IPV6_UNICAST_IF;
level = SOL_IPV6;
}
rc = setsockopt(sd, level, opt, &ifindex, sizeof(ifindex));
if (rc < 0)
log_err_errno("setsockopt(IP_UNICAST_IF)");
return rc;
}
static int set_multicast_if(int sd, int ifindex)
{
struct ip_mreqn mreq = { .imr_ifindex = ifindex };
int rc;
rc = setsockopt(sd, SOL_IP, IP_MULTICAST_IF, &mreq, sizeof(mreq));
if (rc < 0)
log_err_errno("setsockopt(IP_MULTICAST_IF)");
return rc;
}
static int set_membership(int sd, uint32_t grp, uint32_t addr, int ifindex)
{
uint32_t if_addr = addr;
struct ip_mreqn mreq;
int rc;
if (addr == htonl(INADDR_ANY) && !ifindex) {
log_error("Either local address or device needs to be given for multicast membership\n");
return -1;
}
mreq.imr_multiaddr.s_addr = grp;
mreq.imr_address.s_addr = if_addr;
mreq.imr_ifindex = ifindex;
rc = setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
if (rc < 0) {
log_err_errno("setsockopt(IP_ADD_MEMBERSHIP)");
return -1;
}
return 0;
}
static int set_broadcast(int sd)
{
unsigned int one = 1;
int rc = 0;
if (setsockopt(sd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) != 0) {
log_err_errno("setsockopt(SO_BROADCAST)");
rc = -1;
}
return rc;
}
static int set_reuseport(int sd)
{
unsigned int one = 1;
int rc = 0;
if (setsockopt(sd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one)) != 0) {
log_err_errno("setsockopt(SO_REUSEPORT)");
rc = -1;
}
return rc;
}
static int set_reuseaddr(int sd)
{
unsigned int one = 1;
int rc = 0;
if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) != 0) {
log_err_errno("setsockopt(SO_REUSEADDR)");
rc = -1;
}
return rc;
}
static int str_to_uint(const char *str, int min, int max, unsigned int *value)
{
int number;
char *end;
errno = 0;
number = (unsigned int) strtoul(str, &end, 0);
/* entire string should be consumed by conversion
* and value should be between min and max
*/
if (((*end == '\0') || (*end == '\n')) && (end != str) &&
(errno != ERANGE) && (min <= number) && (number <= max)) {
*value = number;
return 0;
}
return -1;
}
static int resolve_devices(struct sock_args *args)
{
if (args->dev) {
args->ifindex = get_ifidx(args->dev);
if (args->ifindex < 0) {
log_error("Invalid device name\n");
return 1;
}
}
if (args->expected_dev) {
unsigned int tmp;
if (str_to_uint(args->expected_dev, 0, INT_MAX, &tmp) == 0) {
args->expected_ifindex = (int)tmp;
} else {
args->expected_ifindex = get_ifidx(args->expected_dev);
if (args->expected_ifindex < 0) {
fprintf(stderr, "Invalid expected device\n");
return 1;
}
}
}
return 0;
}
static int expected_addr_match(struct sockaddr *sa, void *expected,
const char *desc)
{
char addrstr[64];
int rc = 0;
if (sa->sa_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *) sa;
struct in_addr *exp_in = (struct in_addr *) expected;
if (s->sin_addr.s_addr != exp_in->s_addr) {
log_error("%s address does not match expected %s\n",
desc,
inet_ntop(AF_INET, exp_in,
addrstr, sizeof(addrstr)));
rc = 1;
}
} else if (sa->sa_family == AF_INET6) {
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) sa;
struct in6_addr *exp_in = (struct in6_addr *) expected;
if (memcmp(&s6->sin6_addr, exp_in, sizeof(*exp_in))) {
log_error("%s address does not match expected %s\n",
desc,
inet_ntop(AF_INET6, exp_in,
addrstr, sizeof(addrstr)));
rc = 1;
}
} else {
log_error("%s address does not match expected - unknown family\n",
desc);
rc = 1;
}
if (!rc)
log_msg("%s address matches expected\n", desc);
return rc;
}
static int show_sockstat(int sd, struct sock_args *args)
{
struct sockaddr_in6 local_addr, remote_addr;
socklen_t alen = sizeof(local_addr);
struct sockaddr *sa;
const char *desc;
int rc = 0;
desc = server_mode ? "server local:" : "client local:";
sa = (struct sockaddr *) &local_addr;
if (getsockname(sd, sa, &alen) == 0) {
log_address(desc, sa);
if (args->has_expected_laddr) {
rc = expected_addr_match(sa, &args->expected_laddr,
"local");
}
} else {
log_err_errno("getsockname failed");
}
sa = (struct sockaddr *) &remote_addr;
desc = server_mode ? "server peer:" : "client peer:";
if (getpeername(sd, sa, &alen) == 0) {
log_address(desc, sa);
if (args->has_expected_raddr) {
rc |= expected_addr_match(sa, &args->expected_raddr,
"remote");
}
} else {
log_err_errno("getpeername failed");
}
return rc;
}
enum addr_type {
ADDR_TYPE_LOCAL,
ADDR_TYPE_REMOTE,
ADDR_TYPE_MCAST,
ADDR_TYPE_EXPECTED_LOCAL,
ADDR_TYPE_EXPECTED_REMOTE,
ADDR_TYPE_MD5_PREFIX,
};
static int convert_addr(struct sock_args *args, const char *_str,
enum addr_type atype)
{
int pfx_len_max = args->version == AF_INET6 ? 128 : 32;
int family = args->version;
char *str, *dev, *sep;
struct in6_addr *in6;
struct in_addr *in;
const char *desc;
void *addr;
int rc = 0;
str = strdup(_str);
if (!str)
return -ENOMEM;
switch (atype) {
case ADDR_TYPE_LOCAL:
desc = "local";
addr = &args->local_addr;
break;
case ADDR_TYPE_REMOTE:
desc = "remote";
addr = &args->remote_addr;
break;
case ADDR_TYPE_MCAST:
desc = "mcast grp";
addr = &args->grp;
break;
case ADDR_TYPE_EXPECTED_LOCAL:
desc = "expected local";
addr = &args->expected_laddr;
break;
case ADDR_TYPE_EXPECTED_REMOTE:
desc = "expected remote";
addr = &args->expected_raddr;
break;
case ADDR_TYPE_MD5_PREFIX:
desc = "md5 prefix";
if (family == AF_INET) {
args->md5_prefix.v4.sin_family = AF_INET;
addr = &args->md5_prefix.v4.sin_addr;
} else if (family == AF_INET6) {
args->md5_prefix.v6.sin6_family = AF_INET6;
addr = &args->md5_prefix.v6.sin6_addr;
} else
return 1;
sep = strchr(str, '/');
if (sep) {
*sep = '\0';
sep++;
if (str_to_uint(sep, 1, pfx_len_max,
&args->prefix_len) != 0) {
fprintf(stderr, "Invalid port\n");
return 1;
}
} else {
args->prefix_len = 0;
}
break;
default:
log_error("unknown address type\n");
exit(1);
}
switch (family) {
case AF_INET:
in = (struct in_addr *) addr;
if (str) {
if (inet_pton(AF_INET, str, in) == 0) {
log_error("Invalid %s IP address\n", desc);
rc = -1;
goto out;
}
} else {
in->s_addr = htonl(INADDR_ANY);
}
break;
case AF_INET6:
dev = strchr(str, '%');
if (dev) {
*dev = '\0';
dev++;
}
in6 = (struct in6_addr *) addr;
if (str) {
if (inet_pton(AF_INET6, str, in6) == 0) {
log_error("Invalid %s IPv6 address\n", desc);
rc = -1;
goto out;
}
} else {
*in6 = in6addr_any;
}
if (dev) {
args->scope_id = get_ifidx(dev);
if (args->scope_id < 0) {
log_error("Invalid scope on %s IPv6 address\n",
desc);
rc = -1;
goto out;
}
}
break;
default:
log_error("Invalid address family\n");
}
out:
free(str);
return rc;
}
static int validate_addresses(struct sock_args *args)
{
if (args->local_addr_str &&
convert_addr(args, args->local_addr_str, ADDR_TYPE_LOCAL) < 0)
return 1;
if (args->remote_addr_str &&
convert_addr(args, args->remote_addr_str, ADDR_TYPE_REMOTE) < 0)
return 1;
if (args->md5_prefix_str &&
convert_addr(args, args->md5_prefix_str,
ADDR_TYPE_MD5_PREFIX) < 0)
return 1;
if (args->expected_laddr_str &&
convert_addr(args, args->expected_laddr_str,
ADDR_TYPE_EXPECTED_LOCAL))
return 1;
if (args->expected_raddr_str &&
convert_addr(args, args->expected_raddr_str,
ADDR_TYPE_EXPECTED_REMOTE))
return 1;
return 0;
}
static int get_index_from_cmsg(struct msghdr *m)
{
struct cmsghdr *cm;
int ifindex = 0;
char buf[64];
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(m);
m->msg_controllen != 0 && cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(m, cm)) {
if (cm->cmsg_level == SOL_IP &&
cm->cmsg_type == IP_PKTINFO) {
struct in_pktinfo *pi;
pi = (struct in_pktinfo *)(CMSG_DATA(cm));
inet_ntop(AF_INET, &pi->ipi_addr, buf, sizeof(buf));
ifindex = pi->ipi_ifindex;
} else if (cm->cmsg_level == SOL_IPV6 &&
cm->cmsg_type == IPV6_PKTINFO) {
struct in6_pktinfo *pi6;
pi6 = (struct in6_pktinfo *)(CMSG_DATA(cm));
inet_ntop(AF_INET6, &pi6->ipi6_addr, buf, sizeof(buf));
ifindex = pi6->ipi6_ifindex;
}
}
if (ifindex) {
log_msg(" pktinfo: ifindex %d dest addr %s\n",
ifindex, buf);
}
return ifindex;
}
static int send_msg_no_cmsg(int sd, void *addr, socklen_t alen)
{
int err;
again:
err = sendto(sd, msg, msglen, 0, addr, alen);
if (err < 0) {
if (errno == EACCES && try_broadcast) {
try_broadcast = 0;
if (!set_broadcast(sd))
goto again;
errno = EACCES;
}
log_err_errno("sendto failed");
return 1;
}
return 0;
}
static int send_msg_cmsg(int sd, void *addr, socklen_t alen,
int ifindex, int version)
{
unsigned char cmsgbuf[64];
struct iovec iov[2];
struct cmsghdr *cm;
struct msghdr m;
int err;
iov[0].iov_base = msg;
iov[0].iov_len = msglen;
m.msg_iov = iov;
m.msg_iovlen = 1;
m.msg_name = (caddr_t)addr;
m.msg_namelen = alen;
memset(cmsgbuf, 0, sizeof(cmsgbuf));
cm = (struct cmsghdr *)cmsgbuf;
m.msg_control = (caddr_t)cm;
if (version == AF_INET) {
struct in_pktinfo *pi;
cm->cmsg_level = SOL_IP;
cm->cmsg_type = IP_PKTINFO;
cm->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
pi = (struct in_pktinfo *)(CMSG_DATA(cm));
pi->ipi_ifindex = ifindex;
m.msg_controllen = cm->cmsg_len;
} else if (version == AF_INET6) {
struct in6_pktinfo *pi6;
cm->cmsg_level = SOL_IPV6;
cm->cmsg_type = IPV6_PKTINFO;
cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
pi6 = (struct in6_pktinfo *)(CMSG_DATA(cm));
pi6->ipi6_ifindex = ifindex;
m.msg_controllen = cm->cmsg_len;
}
again:
err = sendmsg(sd, &m, 0);
if (err < 0) {
if (errno == EACCES && try_broadcast) {
try_broadcast = 0;
if (!set_broadcast(sd))
goto again;
errno = EACCES;
}
log_err_errno("sendmsg failed");
return 1;
}
return 0;
}
static int send_msg(int sd, void *addr, socklen_t alen, struct sock_args *args)
{
if (args->type == SOCK_STREAM) {
if (write(sd, msg, msglen) < 0) {
log_err_errno("write failed sending msg to peer");
return 1;
}
} else if (args->ifindex && args->use_cmsg) {
if (send_msg_cmsg(sd, addr, alen, args->ifindex, args->version))
return 1;
} else {
if (send_msg_no_cmsg(sd, addr, alen))
return 1;
}
log_msg("Sent message:\n");
log_msg(" %.24s%s\n", msg, msglen > 24 ? " ..." : "");
return 0;
}
static int socket_read_dgram(int sd, struct sock_args *args)
{
unsigned char addr[sizeof(struct sockaddr_in6)];
struct sockaddr *sa = (struct sockaddr *) addr;
socklen_t alen = sizeof(addr);
struct iovec iov[2];
struct msghdr m = {
.msg_name = (caddr_t)addr,
.msg_namelen = alen,
.msg_iov = iov,
.msg_iovlen = 1,
};
unsigned char cmsgbuf[256];
struct cmsghdr *cm = (struct cmsghdr *)cmsgbuf;
char buf[16*1024];
int ifindex;
int len;
iov[0].iov_base = (caddr_t)buf;
iov[0].iov_len = sizeof(buf);
memset(cmsgbuf, 0, sizeof(cmsgbuf));
m.msg_control = (caddr_t)cm;
m.msg_controllen = sizeof(cmsgbuf);
len = recvmsg(sd, &m, 0);
if (len == 0) {
log_msg("peer closed connection.\n");
return 0;
} else if (len < 0) {
log_msg("failed to read message: %d: %s\n",
errno, strerror(errno));
return -1;
}
buf[len] = '\0';
log_address("Message from:", sa);
log_msg(" %.24s%s\n", buf, len > 24 ? " ..." : "");
ifindex = get_index_from_cmsg(&m);
if (args->expected_ifindex) {
if (args->expected_ifindex != ifindex) {
log_error("Device index mismatch: expected %d have %d\n",
args->expected_ifindex, ifindex);
return -1;
}
log_msg("Device index matches: expected %d have %d\n",
args->expected_ifindex, ifindex);
}
if (!interactive && server_mode) {
if (sa->sa_family == AF_INET6) {
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) sa;
struct in6_addr *in6 = &s6->sin6_addr;
if (IN6_IS_ADDR_V4MAPPED(in6)) {
const uint32_t *pa = (uint32_t *) &in6->s6_addr;
struct in_addr in4;
struct sockaddr_in *sin;
sin = (struct sockaddr_in *) addr;
pa += 3;
in4.s_addr = *pa;
sin->sin_addr = in4;
sin->sin_family = AF_INET;
if (send_msg_cmsg(sd, addr, alen,
ifindex, AF_INET) < 0)
goto out_err;
}
}
again:
iov[0].iov_len = len;
if (args->version == AF_INET6) {
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) sa;
if (args->dev) {
/* avoid PKTINFO conflicts with bindtodev */
if (sendto(sd, buf, len, 0,
(void *) addr, alen) < 0)
goto out_err;
} else {
/* kernel is allowing scope_id to be set to VRF
* index for LLA. for sends to global address
* reset scope id
*/
s6->sin6_scope_id = ifindex;
if (sendmsg(sd, &m, 0) < 0)
goto out_err;
}
} else {
int err;
err = sendmsg(sd, &m, 0);
if (err < 0) {
if (errno == EACCES && try_broadcast) {
try_broadcast = 0;
if (!set_broadcast(sd))
goto again;
errno = EACCES;
}
goto out_err;
}
}
log_msg("Sent message:\n");
log_msg(" %.24s%s\n", buf, len > 24 ? " ..." : "");
}
return 1;
out_err:
log_err_errno("failed to send msg to peer");
return -1;
}
static int socket_read_stream(int sd)
{
char buf[1024];
int len;
len = read(sd, buf, sizeof(buf)-1);
if (len == 0) {
log_msg("client closed connection.\n");
return 0;
} else if (len < 0) {
log_msg("failed to read message\n");
return -1;
}
buf[len] = '\0';
log_msg("Incoming message:\n");
log_msg(" %.24s%s\n", buf, len > 24 ? " ..." : "");
if (!interactive && server_mode) {
if (write(sd, buf, len) < 0) {
log_err_errno("failed to send buf");
return -1;
}
log_msg("Sent message:\n");
log_msg(" %.24s%s\n", buf, len > 24 ? " ..." : "");
}
return 1;
}
static int socket_read(int sd, struct sock_args *args)
{
if (args->type == SOCK_STREAM)
return socket_read_stream(sd);
return socket_read_dgram(sd, args);
}
static int stdin_to_socket(int sd, int type, void *addr, socklen_t alen)
{
char buf[1024];
int len;
if (fgets(buf, sizeof(buf), stdin) == NULL)
return 0;
len = strlen(buf);
if (type == SOCK_STREAM) {
if (write(sd, buf, len) < 0) {
log_err_errno("failed to send buf");
return -1;
}
} else {
int err;
again:
err = sendto(sd, buf, len, 0, addr, alen);
if (err < 0) {
if (errno == EACCES && try_broadcast) {
try_broadcast = 0;
if (!set_broadcast(sd))
goto again;
errno = EACCES;
}
log_err_errno("failed to send msg to peer");
return -1;
}
}
log_msg("Sent message:\n");
log_msg(" %.24s%s\n", buf, len > 24 ? " ..." : "");
return 1;
}
static void set_recv_attr(int sd, int version)
{
if (version == AF_INET6) {
set_recvpktinfo_v6(sd);
set_recverr_v6(sd);
} else {
set_pktinfo_v4(sd);
set_recverr_v4(sd);
}
}
static int msg_loop(int client, int sd, void *addr, socklen_t alen,
struct sock_args *args)
{
struct timeval timeout = { .tv_sec = prog_timeout }, *ptval = NULL;
fd_set rfds;
int nfds;
int rc;
if (args->type != SOCK_STREAM)
set_recv_attr(sd, args->version);
if (msg) {
msglen = strlen(msg);
/* client sends first message */
if (client) {
if (send_msg(sd, addr, alen, args))
return 1;
}
if (!interactive) {
ptval = &timeout;
if (!prog_timeout)
timeout.tv_sec = 5;
}
}
nfds = interactive ? MAX(fileno(stdin), sd) + 1 : sd + 1;
while (1) {
FD_ZERO(&rfds);
FD_SET(sd, &rfds);
if (interactive)
FD_SET(fileno(stdin), &rfds);
rc = select(nfds, &rfds, NULL, NULL, ptval);
if (rc < 0) {
if (errno == EINTR)
continue;
rc = 1;
log_err_errno("select failed");
break;
} else if (rc == 0) {
log_error("Timed out waiting for response\n");
rc = 2;
break;
}
if (FD_ISSET(sd, &rfds)) {
rc = socket_read(sd, args);
if (rc < 0) {
rc = 1;
break;
}
if (rc == 0)
break;
}
rc = 0;
if (FD_ISSET(fileno(stdin), &rfds)) {
if (stdin_to_socket(sd, args->type, addr, alen) <= 0)
break;
}
if (interactive)
continue;
if (iter != -1) {
--iter;
if (iter == 0)
break;
}
log_msg("Going into quiet mode\n");
quiet = 1;
if (client) {
if (send_msg(sd, addr, alen, args)) {
rc = 1;
break;
}
}
}
return rc;
}
static int msock_init(struct sock_args *args, int server)
{
uint32_t if_addr = htonl(INADDR_ANY);
struct sockaddr_in laddr = {
.sin_family = AF_INET,
.sin_port = htons(args->port),
};
int one = 1;
int sd;
if (!server && args->has_local_ip)
if_addr = args->local_addr.in.s_addr;
sd = socket(PF_INET, SOCK_DGRAM, 0);
if (sd < 0) {
log_err_errno("socket");
return -1;
}
if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR,
(char *)&one, sizeof(one)) < 0) {
log_err_errno("Setting SO_REUSEADDR error");
goto out_err;
}
if (setsockopt(sd, SOL_SOCKET, SO_BROADCAST,
(char *)&one, sizeof(one)) < 0)
log_err_errno("Setting SO_BROADCAST error");
if (args->dev && bind_to_device(sd, args->dev) != 0)
goto out_err;
else if (args->use_setsockopt &&
set_multicast_if(sd, args->ifindex))
goto out_err;
laddr.sin_addr.s_addr = if_addr;
if (bind(sd, (struct sockaddr *) &laddr, sizeof(laddr)) < 0) {
log_err_errno("bind failed");
goto out_err;
}
if (server &&
set_membership(sd, args->grp.s_addr,
args->local_addr.in.s_addr, args->ifindex))
goto out_err;
return sd;
out_err:
close(sd);
return -1;
}
static int msock_server(struct sock_args *args)
{
return msock_init(args, 1);
}
static int msock_client(struct sock_args *args)
{
return msock_init(args, 0);
}
static int bind_socket(int sd, struct sock_args *args)
{
struct sockaddr_in serv_addr = {
.sin_family = AF_INET,
};
struct sockaddr_in6 serv6_addr = {
.sin6_family = AF_INET6,
};
void *addr;
socklen_t alen;
if (!args->has_local_ip && args->type == SOCK_RAW)
return 0;
switch (args->version) {
case AF_INET:
serv_addr.sin_port = htons(args->port);
serv_addr.sin_addr = args->local_addr.in;
addr = &serv_addr;
alen = sizeof(serv_addr);
break;
case AF_INET6:
serv6_addr.sin6_port = htons(args->port);
serv6_addr.sin6_addr = args->local_addr.in6;
addr = &serv6_addr;
alen = sizeof(serv6_addr);
break;
default:
log_error("Invalid address family\n");
return -1;
}
if (bind(sd, addr, alen) < 0) {
log_err_errno("error binding socket");
return -1;
}
return 0;
}
static int lsock_init(struct sock_args *args)
{
long flags;
int sd;
sd = socket(args->version, args->type, args->protocol);
if (sd < 0) {
log_err_errno("Error opening socket");
return -1;
}
if (set_reuseaddr(sd) != 0)
goto err;
if (set_reuseport(sd) != 0)
goto err;
if (args->dev && bind_to_device(sd, args->dev) != 0)
goto err;
else if (args->use_setsockopt &&
set_unicast_if(sd, args->ifindex, args->version))
goto err;
if (bind_socket(sd, args))
goto err;
if (args->bind_test_only)
goto out;
if (args->type == SOCK_STREAM && listen(sd, 1) < 0) {
log_err_errno("listen failed");
goto err;
}
flags = fcntl(sd, F_GETFL);
if ((flags < 0) || (fcntl(sd, F_SETFL, flags|O_NONBLOCK) < 0)) {
log_err_errno("Failed to set non-blocking option");
goto err;
}
if (fcntl(sd, F_SETFD, FD_CLOEXEC) < 0)
log_err_errno("Failed to set close-on-exec flag");
out:
return sd;
err:
close(sd);
return -1;
}
static void ipc_write(int fd, int message)
{
/* Not in both_mode, so there's no process to signal */
if (fd < 0)
return;
if (write(fd, &message, sizeof(message)) < 0)
log_err_errno("Failed to send client status");
}
static int do_server(struct sock_args *args, int ipc_fd)
{
/* ipc_fd = -1 if no parent process to signal */
struct timeval timeout = { .tv_sec = prog_timeout }, *ptval = NULL;
unsigned char addr[sizeof(struct sockaddr_in6)] = {};
socklen_t alen = sizeof(addr);
int lsd, csd = -1;
fd_set rfds;
int rc;
if (args->serverns) {
if (switch_ns(args->serverns)) {
log_error("Could not set server netns to %s\n",
args->serverns);
goto err_exit;
}
log_msg("Switched server netns\n");
}
args->dev = args->server_dev;
args->expected_dev = args->expected_server_dev;
if (resolve_devices(args) || validate_addresses(args))
goto err_exit;
if (prog_timeout)
ptval = &timeout;
if (args->has_grp)
lsd = msock_server(args);
else
lsd = lsock_init(args);
if (lsd < 0)
goto err_exit;
if (args->bind_test_only) {
close(lsd);
ipc_write(ipc_fd, 1);
return 0;
}
if (args->type != SOCK_STREAM) {
ipc_write(ipc_fd, 1);
rc = msg_loop(0, lsd, (void *) addr, alen, args);
close(lsd);
return rc;
}
if (args->password && tcp_md5_remote(lsd, args)) {
close(lsd);
goto err_exit;
}
ipc_write(ipc_fd, 1);
while (1) {
log_msg("waiting for client connection.\n");
FD_ZERO(&rfds);
FD_SET(lsd, &rfds);
rc = select(lsd+1, &rfds, NULL, NULL, ptval);
if (rc == 0) {
rc = 2;
break;
}
if (rc < 0) {
if (errno == EINTR)
continue;
log_err_errno("select failed");
break;
}
if (FD_ISSET(lsd, &rfds)) {
csd = accept(lsd, (void *) addr, &alen);
if (csd < 0) {
log_err_errno("accept failed");
break;
}
rc = show_sockstat(csd, args);
if (rc)
break;
rc = check_device(csd, args);
if (rc)
break;
}
rc = msg_loop(0, csd, (void *) addr, alen, args);
close(csd);
if (!interactive)
break;
}
close(lsd);
return rc;
err_exit:
ipc_write(ipc_fd, 0);
return 1;
}
static int wait_for_connect(int sd)
{
struct timeval _tv = { .tv_sec = prog_timeout }, *tv = NULL;
fd_set wfd;
int val = 0, sz = sizeof(val);
int rc;
FD_ZERO(&wfd);
FD_SET(sd, &wfd);
if (prog_timeout)
tv = &_tv;
rc = select(FD_SETSIZE, NULL, &wfd, NULL, tv);
if (rc == 0) {
log_error("connect timed out\n");
return -2;
} else if (rc < 0) {
log_err_errno("select failed");
return -3;
}
if (getsockopt(sd, SOL_SOCKET, SO_ERROR, &val, (socklen_t *)&sz) < 0) {
log_err_errno("getsockopt(SO_ERROR) failed");
return -4;
}
if (val != 0) {
log_error("connect failed: %d: %s\n", val, strerror(val));
return -1;
}
return 0;
}
static int connectsock(void *addr, socklen_t alen, struct sock_args *args)
{
int sd, rc = -1;
long flags;
sd = socket(args->version, args->type, args->protocol);
if (sd < 0) {
log_err_errno("Failed to create socket");
return -1;
}
flags = fcntl(sd, F_GETFL);
if ((flags < 0) || (fcntl(sd, F_SETFL, flags|O_NONBLOCK) < 0)) {
log_err_errno("Failed to set non-blocking option");
goto err;
}
if (set_reuseport(sd) != 0)
goto err;
if (args->dev && bind_to_device(sd, args->dev) != 0)
goto err;
else if (args->use_setsockopt &&
set_unicast_if(sd, args->ifindex, args->version))
goto err;
if (args->has_local_ip && bind_socket(sd, args))
goto err;
if (args->type != SOCK_STREAM)
goto out;
if (args->password && tcp_md5sig(sd, addr, alen, args))
goto err;
if (args->bind_test_only)
goto out;
if (connect(sd, addr, alen) < 0) {
if (errno != EINPROGRESS) {
log_err_errno("Failed to connect to remote host");
rc = -1;
goto err;
}
rc = wait_for_connect(sd);
if (rc < 0)
goto err;
}
out:
return sd;
err:
close(sd);
return rc;
}
static int do_client(struct sock_args *args)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
};
struct sockaddr_in6 sin6 = {
.sin6_family = AF_INET6,
};
void *addr;
int alen;
int rc = 0;
int sd;
if (!args->has_remote_ip && !args->has_grp) {
fprintf(stderr, "remote IP or multicast group not given\n");
return 1;
}
if (args->clientns) {
if (switch_ns(args->clientns)) {
log_error("Could not set client netns to %s\n",
args->clientns);
return 1;
}
log_msg("Switched client netns\n");
}
args->local_addr_str = args->client_local_addr_str;
if (resolve_devices(args) || validate_addresses(args))
return 1;
if ((args->use_setsockopt || args->use_cmsg) && !args->ifindex) {
fprintf(stderr, "Device binding not specified\n");
return 1;
}
if (args->use_setsockopt || args->use_cmsg)
args->dev = NULL;
switch (args->version) {
case AF_INET:
sin.sin_port = htons(args->port);
if (args->has_grp)
sin.sin_addr = args->grp;
else
sin.sin_addr = args->remote_addr.in;
addr = &sin;
alen = sizeof(sin);
break;
case AF_INET6:
sin6.sin6_port = htons(args->port);
sin6.sin6_addr = args->remote_addr.in6;
sin6.sin6_scope_id = args->scope_id;
addr = &sin6;
alen = sizeof(sin6);
break;
}
args->password = args->client_pw;
if (args->has_grp)
sd = msock_client(args);
else
sd = connectsock(addr, alen, args);
if (sd < 0)
return -sd;
if (args->bind_test_only)
goto out;
if (args->type == SOCK_STREAM) {
rc = show_sockstat(sd, args);
if (rc != 0)
goto out;
}
rc = msg_loop(1, sd, addr, alen, args);
out:
close(sd);
return rc;
}
static char *random_msg(int len)
{
int i, n = 0, olen = len + 1;
char *m;
if (len <= 0)
return NULL;
m = malloc(olen);
if (!m)
return NULL;
while (len > 26) {
i = snprintf(m + n, olen - n, "%.26s",
"abcdefghijklmnopqrstuvwxyz");
n += i;
len -= i;
}
i = snprintf(m + n, olen - n, "%.*s", len,
"abcdefghijklmnopqrstuvwxyz");
return m;
}
static int ipc_child(int fd, struct sock_args *args)
{
char *outbuf, *errbuf;
int rc = 1;
outbuf = malloc(4096);
errbuf = malloc(4096);
if (!outbuf || !errbuf) {
fprintf(stderr, "server: Failed to allocate buffers for stdout and stderr\n");
goto out;
}
setbuffer(stdout, outbuf, 4096);
setbuffer(stderr, errbuf, 4096);
server_mode = 1; /* to tell log_msg in case we are in both_mode */
/* when running in both mode, address validation applies
* solely to client side
*/
args->has_expected_laddr = 0;
args->has_expected_raddr = 0;
rc = do_server(args, fd);
out:
free(outbuf);
free(errbuf);
return rc;
}
static int ipc_parent(int cpid, int fd, struct sock_args *args)
{
int client_status;
int status;
int buf;
/* do the client-side function here in the parent process,
* waiting to be told when to continue
*/
if (read(fd, &buf, sizeof(buf)) <= 0) {
log_err_errno("Failed to read IPC status from status");
return 1;
}
if (!buf) {
log_error("Server failed; can not continue\n");
return 1;
}
log_msg("Server is ready\n");
client_status = do_client(args);
log_msg("parent is done!\n");
if (kill(cpid, 0) == 0)
kill(cpid, SIGKILL);
wait(&status);
return client_status;
}
#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:M:X:m:d:I:BN:O:SCi6L:0:1:2:3:Fbq"
static void print_usage(char *prog)
{
printf(
"usage: %s OPTS\n"
"Required:\n"
" -r addr remote address to connect to (client mode only)\n"
" -p port port to connect to (client mode)/listen on (server mode)\n"
" (default: %d)\n"
" -s server mode (default: client mode)\n"
" -t timeout seconds (default: none)\n"
"\n"
"Optional:\n"
" -B do both client and server via fork and IPC\n"
" -N ns set client to network namespace ns (requires root)\n"
" -O ns set server to network namespace ns (requires root)\n"
" -F Restart server loop\n"
" -6 IPv6 (default is IPv4)\n"
" -P proto protocol for socket: icmp, ospf (default: none)\n"
" -D|R datagram (D) / raw (R) socket (default stream)\n"
" -l addr local address to bind to in server mode\n"
" -c addr local address to bind to in client mode\n"
"\n"
" -d dev bind socket to given device name\n"
" -I dev bind socket to given device name - server mode\n"
" -S use setsockopt (IP_UNICAST_IF or IP_MULTICAST_IF)\n"
" to set device binding\n"
" -C use cmsg and IP_PKTINFO to specify device binding\n"
"\n"
" -L len send random message of given length\n"
" -n num number of times to send message\n"
"\n"
" -M password use MD5 sum protection\n"
" -X password MD5 password for client mode\n"
" -m prefix/len prefix and length to use for MD5 key\n"
" -g grp multicast group (e.g., 239.1.1.1)\n"
" -i interactive mode (default is echo and terminate)\n"
"\n"
" -0 addr Expected local address\n"
" -1 addr Expected remote address\n"
" -2 dev Expected device name (or index) to receive packet\n"
" -3 dev Expected device name (or index) to receive packets - server mode\n"
"\n"
" -b Bind test only.\n"
" -q Be quiet. Run test without printing anything.\n"
, prog, DEFAULT_PORT);
}
int main(int argc, char *argv[])
{
struct sock_args args = {
.version = AF_INET,
.type = SOCK_STREAM,
.port = DEFAULT_PORT,
};
struct protoent *pe;
int both_mode = 0;
unsigned int tmp;
int forever = 0;
int fd[2];
int cpid;
/* process inputs */
extern char *optarg;
int rc = 0;
/*
* process input args
*/
while ((rc = getopt(argc, argv, GETOPT_STR)) != -1) {
switch (rc) {
case 'B':
both_mode = 1;
break;
case 's':
server_mode = 1;
break;
case 'F':
forever = 1;
break;
case 'l':
args.has_local_ip = 1;
args.local_addr_str = optarg;
break;
case 'r':
args.has_remote_ip = 1;
args.remote_addr_str = optarg;
break;
case 'c':
args.has_local_ip = 1;
args.client_local_addr_str = optarg;
break;
case 'p':
if (str_to_uint(optarg, 1, 65535, &tmp) != 0) {
fprintf(stderr, "Invalid port\n");
return 1;
}
args.port = (unsigned short) tmp;
break;
case 't':
if (str_to_uint(optarg, 0, INT_MAX,
&prog_timeout) != 0) {
fprintf(stderr, "Invalid timeout\n");
return 1;
}
break;
case 'D':
args.type = SOCK_DGRAM;
break;
case 'R':
args.type = SOCK_RAW;
args.port = 0;
if (!args.protocol)
args.protocol = IPPROTO_RAW;
break;
case 'P':
pe = getprotobyname(optarg);
if (pe) {
args.protocol = pe->p_proto;
} else {
if (str_to_uint(optarg, 0, 0xffff, &tmp) != 0) {
fprintf(stderr, "Invalid protocol\n");
return 1;
}
args.protocol = tmp;
}
break;
case 'n':
iter = atoi(optarg);
break;
case 'N':
args.clientns = optarg;
break;
case 'O':
args.serverns = optarg;
break;
case 'L':
msg = random_msg(atoi(optarg));
break;
case 'M':
args.password = optarg;
break;
case 'X':
args.client_pw = optarg;
break;
case 'm':
args.md5_prefix_str = optarg;
break;
case 'S':
args.use_setsockopt = 1;
break;
case 'C':
args.use_cmsg = 1;
break;
case 'd':
args.dev = optarg;
break;
case 'I':
args.server_dev = optarg;
break;
case 'i':
interactive = 1;
break;
case 'g':
args.has_grp = 1;
if (convert_addr(&args, optarg, ADDR_TYPE_MCAST) < 0)
return 1;
args.type = SOCK_DGRAM;
break;
case '6':
args.version = AF_INET6;
break;
case 'b':
args.bind_test_only = 1;
break;
case '0':
args.has_expected_laddr = 1;
args.expected_laddr_str = optarg;
break;
case '1':
args.has_expected_raddr = 1;
args.expected_raddr_str = optarg;
break;
case '2':
args.expected_dev = optarg;
break;
case '3':
args.expected_server_dev = optarg;
break;
case 'q':
quiet = 1;
break;
default:
print_usage(argv[0]);
return 1;
}
}
if (args.password &&
((!args.has_remote_ip && !args.md5_prefix_str) ||
args.type != SOCK_STREAM)) {
log_error("MD5 passwords apply to TCP only and require a remote ip for the password\n");
return 1;
}
if (args.md5_prefix_str && !args.password) {
log_error("Prefix range for MD5 protection specified without a password\n");
return 1;
}
if (iter == 0) {
fprintf(stderr, "Invalid number of messages to send\n");
return 1;
}
if (args.type == SOCK_STREAM && !args.protocol)
args.protocol = IPPROTO_TCP;
if (args.type == SOCK_DGRAM && !args.protocol)
args.protocol = IPPROTO_UDP;
if ((args.type == SOCK_STREAM || args.type == SOCK_DGRAM) &&
args.port == 0) {
fprintf(stderr, "Invalid port number\n");
return 1;
}
if ((both_mode || !server_mode) && !args.has_grp &&
!args.has_remote_ip && !args.has_local_ip) {
fprintf(stderr,
"Local (server mode) or remote IP (client IP) required\n");
return 1;
}
if (interactive) {
prog_timeout = 0;
msg = NULL;
}
if (both_mode) {
if (pipe(fd) < 0) {
perror("pipe");
exit(1);
}
cpid = fork();
if (cpid < 0) {
perror("fork");
exit(1);
}
if (cpid)
return ipc_parent(cpid, fd[0], &args);
return ipc_child(fd[1], &args);
}
if (server_mode) {
do {
rc = do_server(&args, -1);
} while (forever);
return rc;
}
return do_client(&args);
}
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