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100644 407 lines (353 sloc) 9.805 kB
68396ea @rmustacc Initial commit of d32e8d0b8d9e0ef7cf7ab2e74548982972789dfc from qemu-kvm
rmustacc authored
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
123 DEBUG_CALL("fork_exec");
124 DEBUG_ARG("so = %lx", (long)so);
125 DEBUG_ARG("ex = %lx", (long)ex);
126 DEBUG_ARG("do_pty = %lx", (long)do_pty);
127
128 if (do_pty == 2) {
129 return 0;
130 } else {
131 addr.sin_family = AF_INET;
132 addr.sin_port = 0;
133 addr.sin_addr.s_addr = INADDR_ANY;
134
135 if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
136 bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
137 listen(s, 1) < 0) {
138 lprint("Error: inet socket: %s\n", strerror(errno));
139 closesocket(s);
140
141 return 0;
142 }
143 }
144
145 switch(fork()) {
146 case -1:
147 lprint("Error: fork failed: %s\n", strerror(errno));
148 close(s);
149 if (do_pty == 2)
150 close(master);
151 return 0;
152
153 case 0:
154 /* Set the DISPLAY */
155 if (do_pty == 2) {
156 (void) close(master);
157 #ifdef TIOCSCTTY /* XXXXX */
158 (void) setsid();
159 ioctl(s, TIOCSCTTY, (char *)NULL);
160 #endif
161 } else {
162 getsockname(s, (struct sockaddr *)&addr, &addrlen);
163 close(s);
164 /*
165 * Connect to the socket
166 * XXX If any of these fail, we're in trouble!
167 */
168 s = qemu_socket(AF_INET, SOCK_STREAM, 0);
169 addr.sin_addr = loopback_addr;
170 do {
171 ret = connect(s, (struct sockaddr *)&addr, addrlen);
172 } while (ret < 0 && errno == EINTR);
173 }
174
175 dup2(s, 0);
176 dup2(s, 1);
177 dup2(s, 2);
178 for (s = getdtablesize() - 1; s >= 3; s--)
179 close(s);
180
181 i = 0;
182 bptr = qemu_strdup(ex); /* No need to free() this */
183 if (do_pty == 1) {
184 /* Setup "slirp.telnetd -x" */
185 argv[i++] = "slirp.telnetd";
186 argv[i++] = "-x";
187 argv[i++] = bptr;
188 } else
189 do {
190 /* Change the string into argv[] */
191 curarg = bptr;
192 while (*bptr != ' ' && *bptr != (char)0)
193 bptr++;
194 c = *bptr;
195 *bptr++ = (char)0;
196 argv[i++] = strdup(curarg);
197 } while (c);
198
199 argv[i] = NULL;
200 execvp(argv[0], (char **)argv);
201
202 /* Ooops, failed, let's tell the user why */
203 fprintf(stderr, "Error: execvp of %s failed: %s\n",
204 argv[0], strerror(errno));
205 close(0); close(1); close(2); /* XXX */
206 exit(1);
207
208 default:
209 if (do_pty == 2) {
210 close(s);
211 so->s = master;
212 } else {
213 /*
214 * XXX this could block us...
215 * XXX Should set a timer here, and if accept() doesn't
216 * return after X seconds, declare it a failure
217 * The only reason this will block forever is if socket()
218 * of connect() fail in the child process
219 */
220 do {
221 so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
222 } while (so->s < 0 && errno == EINTR);
223 closesocket(s);
224 opt = 1;
225 setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
226 opt = 1;
227 setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
228 }
229 fd_nonblock(so->s);
230
231 /* Append the telnet options now */
232 if (so->so_m != NULL && do_pty == 1) {
233 sbappend(so, so->so_m);
234 so->so_m = NULL;
235 }
236
237 return 1;
238 }
239 }
240 #endif
241
242 #ifndef HAVE_STRDUP
243 char *
244 strdup(str)
245 const char *str;
246 {
247 char *bptr;
248
249 bptr = (char *)malloc(strlen(str)+1);
250 strcpy(bptr, str);
251
252 return bptr;
253 }
254 #endif
255
256 #include "monitor.h"
257
258 void lprint(const char *format, ...)
259 {
260 va_list args;
261
262 va_start(args, format);
263 monitor_vprintf(default_mon, format, args);
264 va_end(args);
265 }
266
267 void
268 u_sleep(int usec)
269 {
270 struct timeval t;
271 fd_set fdset;
272
273 FD_ZERO(&fdset);
274
275 t.tv_sec = 0;
276 t.tv_usec = usec * 1000;
277
278 select(0, &fdset, &fdset, &fdset, &t);
279 }
280
281 /*
282 * Set fd blocking and non-blocking
283 */
284
285 void
286 fd_nonblock(int fd)
287 {
288 #ifdef FIONBIO
289 #ifdef _WIN32
290 unsigned long opt = 1;
291 #else
292 int opt = 1;
293 #endif
294
295 ioctlsocket(fd, FIONBIO, &opt);
296 #else
297 int opt;
298
299 opt = fcntl(fd, F_GETFL, 0);
300 opt |= O_NONBLOCK;
301 fcntl(fd, F_SETFL, opt);
302 #endif
303 }
304
305 void
306 fd_block(int fd)
307 {
308 #ifdef FIONBIO
309 #ifdef _WIN32
310 unsigned long opt = 0;
311 #else
312 int opt = 0;
313 #endif
314
315 ioctlsocket(fd, FIONBIO, &opt);
316 #else
317 int opt;
318
319 opt = fcntl(fd, F_GETFL, 0);
320 opt &= ~O_NONBLOCK;
321 fcntl(fd, F_SETFL, opt);
322 #endif
323 }
324
325 void slirp_connection_info(Slirp *slirp, Monitor *mon)
326 {
327 const char * const tcpstates[] = {
328 [TCPS_CLOSED] = "CLOSED",
329 [TCPS_LISTEN] = "LISTEN",
330 [TCPS_SYN_SENT] = "SYN_SENT",
331 [TCPS_SYN_RECEIVED] = "SYN_RCVD",
332 [TCPS_ESTABLISHED] = "ESTABLISHED",
333 [TCPS_CLOSE_WAIT] = "CLOSE_WAIT",
334 [TCPS_FIN_WAIT_1] = "FIN_WAIT_1",
335 [TCPS_CLOSING] = "CLOSING",
336 [TCPS_LAST_ACK] = "LAST_ACK",
337 [TCPS_FIN_WAIT_2] = "FIN_WAIT_2",
338 [TCPS_TIME_WAIT] = "TIME_WAIT",
339 };
340 struct in_addr dst_addr;
341 struct sockaddr_in src;
342 socklen_t src_len;
343 uint16_t dst_port;
344 struct socket *so;
345 const char *state;
346 char buf[20];
347 int n;
348
349 monitor_printf(mon, " Protocol[State] FD Source Address Port "
350 "Dest. Address Port RecvQ SendQ\n");
351
352 for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
353 if (so->so_state & SS_HOSTFWD) {
354 state = "HOST_FORWARD";
355 } else if (so->so_tcpcb) {
356 state = tcpstates[so->so_tcpcb->t_state];
357 } else {
358 state = "NONE";
359 }
360 if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
361 src_len = sizeof(src);
362 getsockname(so->s, (struct sockaddr *)&src, &src_len);
363 dst_addr = so->so_laddr;
364 dst_port = so->so_lport;
365 } else {
366 src.sin_addr = so->so_laddr;
367 src.sin_port = so->so_lport;
368 dst_addr = so->so_faddr;
369 dst_port = so->so_fport;
370 }
371 n = snprintf(buf, sizeof(buf), " TCP[%s]", state);
372 memset(&buf[n], ' ', 19 - n);
373 buf[19] = 0;
374 monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
375 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
376 ntohs(src.sin_port));
377 monitor_printf(mon, "%15s %5d %5d %5d\n",
378 inet_ntoa(dst_addr), ntohs(dst_port),
379 so->so_rcv.sb_cc, so->so_snd.sb_cc);
380 }
381
382 for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
383 if (so->so_state & SS_HOSTFWD) {
384 n = snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
385 src_len = sizeof(src);
386 getsockname(so->s, (struct sockaddr *)&src, &src_len);
387 dst_addr = so->so_laddr;
388 dst_port = so->so_lport;
389 } else {
390 n = snprintf(buf, sizeof(buf), " UDP[%d sec]",
391 (so->so_expire - curtime) / 1000);
392 src.sin_addr = so->so_laddr;
393 src.sin_port = so->so_lport;
394 dst_addr = so->so_faddr;
395 dst_port = so->so_fport;
396 }
397 memset(&buf[n], ' ', 19 - n);
398 buf[19] = 0;
399 monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
400 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
401 ntohs(src.sin_port));
402 monitor_printf(mon, "%15s %5d %5d %5d\n",
403 inet_ntoa(dst_addr), ntohs(dst_port),
404 so->so_rcv.sb_cc, so->so_snd.sb_cc);
405 }
406 }
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