linux-user: stack_base is now mandatory on all targets
[qemu.git] / slirp / misc.c
1 /*
2 * Copyright (c) 1995 Danny Gasparovski.
3 *
4 * Please read the file COPYRIGHT for the
5 * terms and conditions of the copyright.
6 */
7
8 #include <slirp.h>
9 #include <libslirp.h>
10
11 #include "monitor.h"
12
13 #ifdef DEBUG
14 int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
15 #endif
16
17 struct quehead {
18 struct quehead *qh_link;
19 struct quehead *qh_rlink;
20 };
21
22 inline void
23 insque(void *a, void *b)
24 {
25 register struct quehead *element = (struct quehead *) a;
26 register struct quehead *head = (struct quehead *) b;
27 element->qh_link = head->qh_link;
28 head->qh_link = (struct quehead *)element;
29 element->qh_rlink = (struct quehead *)head;
30 ((struct quehead *)(element->qh_link))->qh_rlink
31 = (struct quehead *)element;
32 }
33
34 inline void
35 remque(void *a)
36 {
37 register struct quehead *element = (struct quehead *) a;
38 ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
39 ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
40 element->qh_rlink = NULL;
41 }
42
43 int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
44 struct in_addr addr, int port)
45 {
46 struct ex_list *tmp_ptr;
47
48 /* First, check if the port is "bound" */
49 for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
50 if (port == tmp_ptr->ex_fport &&
51 addr.s_addr == tmp_ptr->ex_addr.s_addr)
52 return -1;
53 }
54
55 tmp_ptr = *ex_ptr;
56 *ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));
57 (*ex_ptr)->ex_fport = port;
58 (*ex_ptr)->ex_addr = addr;
59 (*ex_ptr)->ex_pty = do_pty;
60 (*ex_ptr)->ex_exec = (do_pty == 3) ? exec : strdup(exec);
61 (*ex_ptr)->ex_next = tmp_ptr;
62 return 0;
63 }
64
65 #ifndef HAVE_STRERROR
66
67 /*
68 * For systems with no strerror
69 */
70
71 extern int sys_nerr;
72 extern char *sys_errlist[];
73
74 char *
75 strerror(error)
76 int error;
77 {
78 if (error < sys_nerr)
79 return sys_errlist[error];
80 else
81 return "Unknown error.";
82 }
83
84 #endif
85
86
87 #ifdef _WIN32
88
89 int
90 fork_exec(struct socket *so, const char *ex, int do_pty)
91 {
92 /* not implemented */
93 return 0;
94 }
95
96 #else
97
98 /*
99 * XXX This is ugly
100 * We create and bind a socket, then fork off to another
101 * process, which connects to this socket, after which we
102 * exec the wanted program. If something (strange) happens,
103 * the accept() call could block us forever.
104 *
105 * do_pty = 0 Fork/exec inetd style
106 * do_pty = 1 Fork/exec using slirp.telnetd
107 * do_ptr = 2 Fork/exec using pty
108 */
109 int
110 fork_exec(struct socket *so, const char *ex, int do_pty)
111 {
112 int s;
113 struct sockaddr_in addr;
114 socklen_t addrlen = sizeof(addr);
115 int opt;
116 int master = -1;
117 const char *argv[256];
118 /* don't want to clobber the original */
119 char *bptr;
120 const char *curarg;
121 int c, i, ret;
122 pid_t pid;
123
124 DEBUG_CALL("fork_exec");
125 DEBUG_ARG("so = %lx", (long)so);
126 DEBUG_ARG("ex = %lx", (long)ex);
127 DEBUG_ARG("do_pty = %lx", (long)do_pty);
128
129 if (do_pty == 2) {
130 return 0;
131 } else {
132 addr.sin_family = AF_INET;
133 addr.sin_port = 0;
134 addr.sin_addr.s_addr = INADDR_ANY;
135
136 if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
137 bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
138 listen(s, 1) < 0) {
139 lprint("Error: inet socket: %s\n", strerror(errno));
140 closesocket(s);
141
142 return 0;
143 }
144 }
145
146 pid = fork();
147 switch(pid) {
148 case -1:
149 lprint("Error: fork failed: %s\n", strerror(errno));
150 close(s);
151 if (do_pty == 2)
152 close(master);
153 return 0;
154
155 case 0:
156 setsid();
157
158 /* Set the DISPLAY */
159 if (do_pty == 2) {
160 (void) close(master);
161 #ifdef TIOCSCTTY /* XXXXX */
162 ioctl(s, TIOCSCTTY, (char *)NULL);
163 #endif
164 } else {
165 getsockname(s, (struct sockaddr *)&addr, &addrlen);
166 close(s);
167 /*
168 * Connect to the socket
169 * XXX If any of these fail, we're in trouble!
170 */
171 s = qemu_socket(AF_INET, SOCK_STREAM, 0);
172 addr.sin_addr = loopback_addr;
173 do {
174 ret = connect(s, (struct sockaddr *)&addr, addrlen);
175 } while (ret < 0 && errno == EINTR);
176 }
177
178 dup2(s, 0);
179 dup2(s, 1);
180 dup2(s, 2);
181 for (s = getdtablesize() - 1; s >= 3; s--)
182 close(s);
183
184 i = 0;
185 bptr = g_strdup(ex); /* No need to free() this */
186 if (do_pty == 1) {
187 /* Setup "slirp.telnetd -x" */
188 argv[i++] = "slirp.telnetd";
189 argv[i++] = "-x";
190 argv[i++] = bptr;
191 } else
192 do {
193 /* Change the string into argv[] */
194 curarg = bptr;
195 while (*bptr != ' ' && *bptr != (char)0)
196 bptr++;
197 c = *bptr;
198 *bptr++ = (char)0;
199 argv[i++] = strdup(curarg);
200 } while (c);
201
202 argv[i] = NULL;
203 execvp(argv[0], (char **)argv);
204
205 /* Ooops, failed, let's tell the user why */
206 fprintf(stderr, "Error: execvp of %s failed: %s\n",
207 argv[0], strerror(errno));
208 close(0); close(1); close(2); /* XXX */
209 exit(1);
210
211 default:
212 qemu_add_child_watch(pid);
213 if (do_pty == 2) {
214 close(s);
215 so->s = master;
216 } else {
217 /*
218 * XXX this could block us...
219 * XXX Should set a timer here, and if accept() doesn't
220 * return after X seconds, declare it a failure
221 * The only reason this will block forever is if socket()
222 * of connect() fail in the child process
223 */
224 do {
225 so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
226 } while (so->s < 0 && errno == EINTR);
227 closesocket(s);
228 opt = 1;
229 setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
230 opt = 1;
231 setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
232 }
233 fd_nonblock(so->s);
234
235 /* Append the telnet options now */
236 if (so->so_m != NULL && do_pty == 1) {
237 sbappend(so, so->so_m);
238 so->so_m = NULL;
239 }
240
241 return 1;
242 }
243 }
244 #endif
245
246 #ifndef HAVE_STRDUP
247 char *
248 strdup(str)
249 const char *str;
250 {
251 char *bptr;
252
253 bptr = (char *)malloc(strlen(str)+1);
254 strcpy(bptr, str);
255
256 return bptr;
257 }
258 #endif
259
260 #include "monitor.h"
261
262 void lprint(const char *format, ...)
263 {
264 va_list args;
265
266 va_start(args, format);
267 monitor_vprintf(default_mon, format, args);
268 va_end(args);
269 }
270
271 void
272 u_sleep(int usec)
273 {
274 struct timeval t;
275 fd_set fdset;
276
277 FD_ZERO(&fdset);
278
279 t.tv_sec = 0;
280 t.tv_usec = usec * 1000;
281
282 select(0, &fdset, &fdset, &fdset, &t);
283 }
284
285 /*
286 * Set fd blocking and non-blocking
287 */
288
289 void
290 fd_nonblock(int fd)
291 {
292 #ifdef FIONBIO
293 #ifdef _WIN32
294 unsigned long opt = 1;
295 #else
296 int opt = 1;
297 #endif
298
299 ioctlsocket(fd, FIONBIO, &opt);
300 #else
301 int opt;
302
303 opt = fcntl(fd, F_GETFL, 0);
304 opt |= O_NONBLOCK;
305 fcntl(fd, F_SETFL, opt);
306 #endif
307 }
308
309 void
310 fd_block(int fd)
311 {
312 #ifdef FIONBIO
313 #ifdef _WIN32
314 unsigned long opt = 0;
315 #else
316 int opt = 0;
317 #endif
318
319 ioctlsocket(fd, FIONBIO, &opt);
320 #else
321 int opt;
322
323 opt = fcntl(fd, F_GETFL, 0);
324 opt &= ~O_NONBLOCK;
325 fcntl(fd, F_SETFL, opt);
326 #endif
327 }
328
329 void slirp_connection_info(Slirp *slirp, Monitor *mon)
330 {
331 const char * const tcpstates[] = {
332 [TCPS_CLOSED] = "CLOSED",
333 [TCPS_LISTEN] = "LISTEN",
334 [TCPS_SYN_SENT] = "SYN_SENT",
335 [TCPS_SYN_RECEIVED] = "SYN_RCVD",
336 [TCPS_ESTABLISHED] = "ESTABLISHED",
337 [TCPS_CLOSE_WAIT] = "CLOSE_WAIT",
338 [TCPS_FIN_WAIT_1] = "FIN_WAIT_1",
339 [TCPS_CLOSING] = "CLOSING",
340 [TCPS_LAST_ACK] = "LAST_ACK",
341 [TCPS_FIN_WAIT_2] = "FIN_WAIT_2",
342 [TCPS_TIME_WAIT] = "TIME_WAIT",
343 };
344 struct in_addr dst_addr;
345 struct sockaddr_in src;
346 socklen_t src_len;
347 uint16_t dst_port;
348 struct socket *so;
349 const char *state;
350 char buf[20];
351 int n;
352
353 monitor_printf(mon, " Protocol[State] FD Source Address Port "
354 "Dest. Address Port RecvQ SendQ\n");
355
356 for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
357 if (so->so_state & SS_HOSTFWD) {
358 state = "HOST_FORWARD";
359 } else if (so->so_tcpcb) {
360 state = tcpstates[so->so_tcpcb->t_state];
361 } else {
362 state = "NONE";
363 }
364 if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
365 src_len = sizeof(src);
366 getsockname(so->s, (struct sockaddr *)&src, &src_len);
367 dst_addr = so->so_laddr;
368 dst_port = so->so_lport;
369 } else {
370 src.sin_addr = so->so_laddr;
371 src.sin_port = so->so_lport;
372 dst_addr = so->so_faddr;
373 dst_port = so->so_fport;
374 }
375 n = snprintf(buf, sizeof(buf), " TCP[%s]", state);
376 memset(&buf[n], ' ', 19 - n);
377 buf[19] = 0;
378 monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
379 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
380 ntohs(src.sin_port));
381 monitor_printf(mon, "%15s %5d %5d %5d\n",
382 inet_ntoa(dst_addr), ntohs(dst_port),
383 so->so_rcv.sb_cc, so->so_snd.sb_cc);
384 }
385
386 for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
387 if (so->so_state & SS_HOSTFWD) {
388 n = snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
389 src_len = sizeof(src);
390 getsockname(so->s, (struct sockaddr *)&src, &src_len);
391 dst_addr = so->so_laddr;
392 dst_port = so->so_lport;
393 } else {
394 n = snprintf(buf, sizeof(buf), " UDP[%d sec]",
395 (so->so_expire - curtime) / 1000);
396 src.sin_addr = so->so_laddr;
397 src.sin_port = so->so_lport;
398 dst_addr = so->so_faddr;
399 dst_port = so->so_fport;
400 }
401 memset(&buf[n], ' ', 19 - n);
402 buf[19] = 0;
403 monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
404 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
405 ntohs(src.sin_port));
406 monitor_printf(mon, "%15s %5d %5d %5d\n",
407 inet_ntoa(dst_addr), ntohs(dst_port),
408 so->so_rcv.sb_cc, so->so_snd.sb_cc);
409 }
410
411 for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
412 n = snprintf(buf, sizeof(buf), " ICMP[%d sec]",
413 (so->so_expire - curtime) / 1000);
414 src.sin_addr = so->so_laddr;
415 dst_addr = so->so_faddr;
416 memset(&buf[n], ' ', 19 - n);
417 buf[19] = 0;
418 monitor_printf(mon, "%s %3d %15s - ", buf, so->s,
419 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
420 monitor_printf(mon, "%15s - %5d %5d\n", inet_ntoa(dst_addr),
421 so->so_rcv.sb_cc, so->so_snd.sb_cc);
422 }
423 }