1 /* $OpenBSD: tcpdrop.c,v 1.4 2004/05/22 23:55:22 deraadt Exp $ */
4 * Copyright (c) 2009 Juli Mallett <jmallett@FreeBSD.org>
5 * Copyright (c) 2004 Markus Friedl <markus@openbsd.org>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include <sys/param.h>
21 #include <sys/types.h>
22 #include <sys/socket.h>
23 #include <sys/socketvar.h>
24 #include <sys/sysctl.h>
26 #include <netinet/in.h>
27 #include <netinet/in_pcb.h>
29 #include <netinet/tcp_fsm.h>
30 #include <netinet/tcp_var.h>
40 #define TCPDROP_FOREIGN 0
41 #define TCPDROP_LOCAL 1
47 char hs_host[NI_MAXHOST];
48 char hs_service[NI_MAXSERV];
51 static bool tcpswitch_list_commands = false;
53 static char *findport(const char *);
54 static struct xinpgen *getxpcblist(const char *);
55 static void sockinfo(const struct sockaddr *, struct host_service *);
56 static bool tcpswitch(const struct sockaddr *, const struct sockaddr *, int);
57 static bool tcpswitchall(const char *, int);
58 static bool tcpswitchbyname(const char *, const char *, const char *,
60 static bool tcpswitchconn(const struct in_conninfo *, int);
61 static void usage(void) __dead2;
64 * Switch a tcp connection.
67 main(int argc, char *argv[])
69 char stack[TCP_FUNCTION_NAME_LEN_MAX];
71 bool switchall, switchallstack;
75 switchallstack = false;
79 while ((ch = getopt(argc, argv, "ailS:s")) != -1) {
88 tcpswitch_list_commands = true;
91 switchallstack = true;
92 strlcpy(stack, optarg, sizeof(stack));
104 if (switchall && switchallstack)
106 if (switchall || switchallstack) {
109 if (!tcpswitchall(stack, mode))
114 if ((argc != 2 && argc != 4) || tcpswitch_list_commands)
118 lport = findport(argv[0]);
119 fport = findport(argv[1]);
120 if (lport == NULL || lport[1] == '\0' || fport == NULL ||
125 if (!tcpswitchbyname(argv[0], lport, argv[1], fport, mode))
127 } else if (!tcpswitchbyname(argv[0], argv[1], argv[2], argv[3], mode))
134 findport(const char *arg)
138 /* A strrspn() or strrpbrk() would be nice. */
139 dot = strrchr(arg, '.');
140 colon = strrchr(arg, ':');
151 static struct xinpgen *
152 getxpcblist(const char *name)
154 struct xinpgen *xinp;
159 rv = sysctlbyname(name, NULL, &len, NULL, 0);
161 err(1, "sysctlbyname %s", name);
164 errx(1, "%s is empty", name);
168 errx(1, "malloc failed");
170 rv = sysctlbyname(name, xinp, &len, NULL, 0);
172 err(1, "sysctlbyname %s", name);
178 sockinfo(const struct sockaddr *sa, struct host_service *hs)
180 static const int flags = NI_NUMERICHOST | NI_NUMERICSERV;
183 rv = getnameinfo(sa, sa->sa_len, hs->hs_host, sizeof hs->hs_host,
184 hs->hs_service, sizeof hs->hs_service, flags);
186 err(1, "getnameinfo");
190 tcpswitch(const struct sockaddr *lsa, const struct sockaddr *fsa, int mode)
192 struct host_service local, foreign;
193 struct sockaddr_storage addrs[2];
196 memcpy(&addrs[TCPDROP_FOREIGN], fsa, fsa->sa_len);
197 memcpy(&addrs[TCPDROP_LOCAL], lsa, lsa->sa_len);
199 sockinfo(lsa, &local);
200 sockinfo(fsa, &foreign);
202 if (tcpswitch_list_commands) {
203 printf("switch_tls %s %s %s %s %s\n",
204 mode == SW_TLS ? "-s" : "-i",
205 local.hs_host, local.hs_service,
206 foreign.hs_host, foreign.hs_service);
210 rv = sysctlbyname(mode == SW_TLS ? "net.inet.tcp.switch_to_sw_tls" :
211 "net.inet.tcp.switch_to_ifnet_tls", NULL, NULL, &addrs,
214 warn("%s %s %s %s", local.hs_host, local.hs_service,
215 foreign.hs_host, foreign.hs_service);
218 printf("%s %s %s %s: switched\n", local.hs_host, local.hs_service,
219 foreign.hs_host, foreign.hs_service);
224 tcpswitchall(const char *stack, int mode)
226 struct xinpgen *head, *xinp;
233 head = getxpcblist("net.inet.tcp.pcblist");
235 #define XINP_NEXT(xinp) \
236 ((struct xinpgen *)(uintptr_t)((uintptr_t)(xinp) + (xinp)->xig_len))
238 for (xinp = XINP_NEXT(head); xinp->xig_len > sizeof *xinp;
239 xinp = XINP_NEXT(xinp)) {
240 xtp = (struct xtcpcb *)xinp;
245 * Check protocol, support just v4 or v6, etc.
248 /* Ignore PCBs which were freed during copyout. */
249 if (xip->inp_gencnt > head->xig_gen)
252 /* Skip listening sockets. */
253 if (xtp->t_state == TCPS_LISTEN)
256 /* If requested, skip sockets not having the requested stack. */
257 if (stack[0] != '\0' &&
258 strncmp(xtp->xt_stack, stack, TCP_FUNCTION_NAME_LEN_MAX))
261 if (!tcpswitchconn(&xip->inp_inc, mode))
270 tcpswitchbyname(const char *lhost, const char *lport, const char *fhost,
271 const char *fport, int mode)
273 static const struct addrinfo hints = {
275 * Look for streams in all domains.
277 .ai_family = AF_UNSPEC,
278 .ai_socktype = SOCK_STREAM,
280 struct addrinfo *ail, *local, *aif, *foreign;
284 error = getaddrinfo(lhost, lport, &hints, &local);
286 errx(1, "getaddrinfo: %s port %s: %s", lhost, lport,
287 gai_strerror(error));
289 error = getaddrinfo(fhost, fport, &hints, &foreign);
291 freeaddrinfo(local); /* XXX gratuitous */
292 errx(1, "getaddrinfo: %s port %s: %s", fhost, fport,
293 gai_strerror(error));
300 * Try every combination of local and foreign address pairs.
302 for (ail = local; ail != NULL; ail = ail->ai_next) {
303 for (aif = foreign; aif != NULL; aif = aif->ai_next) {
304 if (ail->ai_family != aif->ai_family)
307 if (!tcpswitch(ail->ai_addr, aif->ai_addr, mode))
313 warnx("%s %s %s %s: different address families", lhost, lport,
319 freeaddrinfo(foreign);
325 tcpswitchconn(const struct in_conninfo *inc, int mode)
327 struct sockaddr *local, *foreign;
328 struct sockaddr_in6 sin6[2];
329 struct sockaddr_in sin4[2];
331 if ((inc->inc_flags & INC_ISIPV6) != 0) {
332 memset(sin6, 0, sizeof sin6);
334 sin6[TCPDROP_LOCAL].sin6_len = sizeof sin6[TCPDROP_LOCAL];
335 sin6[TCPDROP_LOCAL].sin6_family = AF_INET6;
336 sin6[TCPDROP_LOCAL].sin6_port = inc->inc_lport;
337 memcpy(&sin6[TCPDROP_LOCAL].sin6_addr, &inc->inc6_laddr,
338 sizeof inc->inc6_laddr);
339 local = (struct sockaddr *)&sin6[TCPDROP_LOCAL];
341 sin6[TCPDROP_FOREIGN].sin6_len = sizeof sin6[TCPDROP_FOREIGN];
342 sin6[TCPDROP_FOREIGN].sin6_family = AF_INET6;
343 sin6[TCPDROP_FOREIGN].sin6_port = inc->inc_fport;
344 memcpy(&sin6[TCPDROP_FOREIGN].sin6_addr, &inc->inc6_faddr,
345 sizeof inc->inc6_faddr);
346 foreign = (struct sockaddr *)&sin6[TCPDROP_FOREIGN];
348 memset(sin4, 0, sizeof sin4);
350 sin4[TCPDROP_LOCAL].sin_len = sizeof sin4[TCPDROP_LOCAL];
351 sin4[TCPDROP_LOCAL].sin_family = AF_INET;
352 sin4[TCPDROP_LOCAL].sin_port = inc->inc_lport;
353 memcpy(&sin4[TCPDROP_LOCAL].sin_addr, &inc->inc_laddr,
354 sizeof inc->inc_laddr);
355 local = (struct sockaddr *)&sin4[TCPDROP_LOCAL];
357 sin4[TCPDROP_FOREIGN].sin_len = sizeof sin4[TCPDROP_FOREIGN];
358 sin4[TCPDROP_FOREIGN].sin_family = AF_INET;
359 sin4[TCPDROP_FOREIGN].sin_port = inc->inc_fport;
360 memcpy(&sin4[TCPDROP_FOREIGN].sin_addr, &inc->inc_faddr,
361 sizeof inc->inc_faddr);
362 foreign = (struct sockaddr *)&sin4[TCPDROP_FOREIGN];
365 return (tcpswitch(local, foreign, mode));
372 "usage: switch_tls [-i | -s] local-address local-port foreign-address foreign-port\n"
373 " switch_tls [-i | -s] local-address:local-port foreign-address:foreign-port\n"
374 " switch_tls [-i | -s] local-address.local-port foreign-address.foreign-port\n"
375 " switch_tls [-l | -i | -s] -a\n"
376 " switch_tls [-l | -i | -s] -S stack\n");