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1/*
2 * Copyright (c) 1995 Danny Gasparovski.
5fafdf24 3 *
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4 * Please read the file COPYRIGHT for the
5 * terms and conditions of the copyright.
6 */
7
f0cbd3ec 8#include <slirp.h>
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9#include <libslirp.h>
10
83c9089e 11#include "monitor/monitor.h"
6a1751b7 12#include "qemu/main-loop.h"
f0cbd3ec 13
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14#ifdef DEBUG
15int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
16#endif
17
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18struct quehead {
19 struct quehead *qh_link;
20 struct quehead *qh_rlink;
21};
22
23inline void
511d2b14 24insque(void *a, void *b)
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25{
26 register struct quehead *element = (struct quehead *) a;
27 register struct quehead *head = (struct quehead *) b;
28 element->qh_link = head->qh_link;
29 head->qh_link = (struct quehead *)element;
30 element->qh_rlink = (struct quehead *)head;
31 ((struct quehead *)(element->qh_link))->qh_rlink
32 = (struct quehead *)element;
33}
34
35inline void
511d2b14 36remque(void *a)
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37{
38 register struct quehead *element = (struct quehead *) a;
39 ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
40 ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
41 element->qh_rlink = NULL;
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42}
43
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44int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
45 struct in_addr addr, int port)
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46{
47 struct ex_list *tmp_ptr;
5fafdf24 48
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49 /* First, check if the port is "bound" */
50 for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
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51 if (port == tmp_ptr->ex_fport &&
52 addr.s_addr == tmp_ptr->ex_addr.s_addr)
53 return -1;
f0cbd3ec 54 }
5fafdf24 55
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56 tmp_ptr = *ex_ptr;
57 *ex_ptr = (struct ex_list *)malloc(sizeof(struct ex_list));
58 (*ex_ptr)->ex_fport = port;
59 (*ex_ptr)->ex_addr = addr;
60 (*ex_ptr)->ex_pty = do_pty;
e1c5a2b3 61 (*ex_ptr)->ex_exec = (do_pty == 3) ? exec : strdup(exec);
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62 (*ex_ptr)->ex_next = tmp_ptr;
63 return 0;
64}
65
66#ifndef HAVE_STRERROR
67
68/*
69 * For systems with no strerror
70 */
71
72extern int sys_nerr;
73extern char *sys_errlist[];
74
75char *
76strerror(error)
77 int error;
78{
79 if (error < sys_nerr)
80 return sys_errlist[error];
81 else
82 return "Unknown error.";
83}
84
85#endif
86
87
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88#ifdef _WIN32
89
90int
9634d903 91fork_exec(struct socket *so, const char *ex, int do_pty)
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92{
93 /* not implemented */
94 return 0;
95}
96
97#else
98
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99/*
100 * XXX This is ugly
101 * We create and bind a socket, then fork off to another
102 * process, which connects to this socket, after which we
103 * exec the wanted program. If something (strange) happens,
104 * the accept() call could block us forever.
5fafdf24 105 *
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106 * do_pty = 0 Fork/exec inetd style
107 * do_pty = 1 Fork/exec using slirp.telnetd
108 * do_ptr = 2 Fork/exec using pty
109 */
110int
9634d903 111fork_exec(struct socket *so, const char *ex, int do_pty)
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112{
113 int s;
114 struct sockaddr_in addr;
242acf3a 115 socklen_t addrlen = sizeof(addr);
f0cbd3ec 116 int opt;
7ccfb2eb 117 const char *argv[256];
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118 /* don't want to clobber the original */
119 char *bptr;
9634d903 120 const char *curarg;
7b91a172 121 int c, i, ret;
4d54ec78 122 pid_t pid;
5fafdf24 123
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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);
5fafdf24 128
f0cbd3ec 129 if (do_pty == 2) {
3f9b2b1f 130 return 0;
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131 } else {
132 addr.sin_family = AF_INET;
133 addr.sin_port = 0;
134 addr.sin_addr.s_addr = INADDR_ANY;
3b46e624 135
40ff6d7e 136 if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
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137 bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
138 listen(s, 1) < 0) {
139 lprint("Error: inet socket: %s\n", strerror(errno));
379ff53d 140 closesocket(s);
3b46e624 141
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142 return 0;
143 }
144 }
5fafdf24 145
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146 pid = fork();
147 switch(pid) {
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148 case -1:
149 lprint("Error: fork failed: %s\n", strerror(errno));
150 close(s);
f0cbd3ec 151 return 0;
3b46e624 152
f0cbd3ec 153 case 0:
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154 setsid();
155
f0cbd3ec 156 /* Set the DISPLAY */
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157 getsockname(s, (struct sockaddr *)&addr, &addrlen);
158 close(s);
159 /*
160 * Connect to the socket
161 * XXX If any of these fail, we're in trouble!
162 */
163 s = qemu_socket(AF_INET, SOCK_STREAM, 0);
164 addr.sin_addr = loopback_addr;
165 do {
166 ret = connect(s, (struct sockaddr *)&addr, addrlen);
167 } while (ret < 0 && errno == EINTR);
3b46e624 168
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169 dup2(s, 0);
170 dup2(s, 1);
171 dup2(s, 2);
9634d903 172 for (s = getdtablesize() - 1; s >= 3; s--)
f0cbd3ec 173 close(s);
3b46e624 174
f0cbd3ec 175 i = 0;
7267c094 176 bptr = g_strdup(ex); /* No need to free() this */
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177 if (do_pty == 1) {
178 /* Setup "slirp.telnetd -x" */
179 argv[i++] = "slirp.telnetd";
180 argv[i++] = "-x";
181 argv[i++] = bptr;
182 } else
183 do {
184 /* Change the string into argv[] */
185 curarg = bptr;
186 while (*bptr != ' ' && *bptr != (char)0)
187 bptr++;
188 c = *bptr;
189 *bptr++ = (char)0;
190 argv[i++] = strdup(curarg);
191 } while (c);
3b46e624 192
511d2b14 193 argv[i] = NULL;
7ccfb2eb 194 execvp(argv[0], (char **)argv);
3b46e624 195
f0cbd3ec 196 /* Ooops, failed, let's tell the user why */
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197 fprintf(stderr, "Error: execvp of %s failed: %s\n",
198 argv[0], strerror(errno));
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199 close(0); close(1); close(2); /* XXX */
200 exit(1);
3b46e624 201
f0cbd3ec 202 default:
4d54ec78 203 qemu_add_child_watch(pid);
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204 /*
205 * XXX this could block us...
206 * XXX Should set a timer here, and if accept() doesn't
207 * return after X seconds, declare it a failure
208 * The only reason this will block forever is if socket()
209 * of connect() fail in the child process
210 */
211 do {
212 so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
213 } while (so->s < 0 && errno == EINTR);
214 closesocket(s);
aad1239a 215 socket_set_fast_reuse(so->s);
9f1134d4 216 opt = 1;
9957fc7f 217 qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
f9e8cacc 218 qemu_set_nonblock(so->s);
3b46e624 219
f0cbd3ec 220 /* Append the telnet options now */
511d2b14 221 if (so->so_m != NULL && do_pty == 1) {
f0cbd3ec 222 sbappend(so, so->so_m);
511d2b14 223 so->so_m = NULL;
f0cbd3ec 224 }
3b46e624 225
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226 return 1;
227 }
228}
229#endif
230
231#ifndef HAVE_STRDUP
232char *
233strdup(str)
234 const char *str;
235{
236 char *bptr;
5fafdf24 237
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238 bptr = (char *)malloc(strlen(str)+1);
239 strcpy(bptr, str);
5fafdf24 240
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241 return bptr;
242}
243#endif
244
31a60e22
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245void lprint(const char *format, ...)
246{
247 va_list args;
248
249 va_start(args, format);
8631b608 250 monitor_vprintf(default_mon, format, args);
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251 va_end(args);
252}
f0cbd3ec 253
9f8bd042 254void slirp_connection_info(Slirp *slirp, Monitor *mon)
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255{
256 const char * const tcpstates[] = {
257 [TCPS_CLOSED] = "CLOSED",
258 [TCPS_LISTEN] = "LISTEN",
259 [TCPS_SYN_SENT] = "SYN_SENT",
260 [TCPS_SYN_RECEIVED] = "SYN_RCVD",
261 [TCPS_ESTABLISHED] = "ESTABLISHED",
262 [TCPS_CLOSE_WAIT] = "CLOSE_WAIT",
263 [TCPS_FIN_WAIT_1] = "FIN_WAIT_1",
264 [TCPS_CLOSING] = "CLOSING",
265 [TCPS_LAST_ACK] = "LAST_ACK",
266 [TCPS_FIN_WAIT_2] = "FIN_WAIT_2",
267 [TCPS_TIME_WAIT] = "TIME_WAIT",
268 };
269 struct in_addr dst_addr;
270 struct sockaddr_in src;
271 socklen_t src_len;
272 uint16_t dst_port;
273 struct socket *so;
274 const char *state;
275 char buf[20];
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276
277 monitor_printf(mon, " Protocol[State] FD Source Address Port "
278 "Dest. Address Port RecvQ SendQ\n");
279
460fec67 280 for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
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281 if (so->so_state & SS_HOSTFWD) {
282 state = "HOST_FORWARD";
283 } else if (so->so_tcpcb) {
284 state = tcpstates[so->so_tcpcb->t_state];
285 } else {
286 state = "NONE";
287 }
288 if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
289 src_len = sizeof(src);
290 getsockname(so->s, (struct sockaddr *)&src, &src_len);
291 dst_addr = so->so_laddr;
292 dst_port = so->so_lport;
293 } else {
294 src.sin_addr = so->so_laddr;
295 src.sin_port = so->so_lport;
296 dst_addr = so->so_faddr;
297 dst_port = so->so_fport;
298 }
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299 snprintf(buf, sizeof(buf), " TCP[%s]", state);
300 monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
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301 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
302 ntohs(src.sin_port));
303 monitor_printf(mon, "%15s %5d %5d %5d\n",
304 inet_ntoa(dst_addr), ntohs(dst_port),
305 so->so_rcv.sb_cc, so->so_snd.sb_cc);
306 }
307
460fec67 308 for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
6dbe553f 309 if (so->so_state & SS_HOSTFWD) {
f293d8b1 310 snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
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311 src_len = sizeof(src);
312 getsockname(so->s, (struct sockaddr *)&src, &src_len);
313 dst_addr = so->so_laddr;
314 dst_port = so->so_lport;
315 } else {
f293d8b1 316 snprintf(buf, sizeof(buf), " UDP[%d sec]",
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317 (so->so_expire - curtime) / 1000);
318 src.sin_addr = so->so_laddr;
319 src.sin_port = so->so_lport;
320 dst_addr = so->so_faddr;
321 dst_port = so->so_fport;
322 }
f293d8b1 323 monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
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324 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
325 ntohs(src.sin_port));
326 monitor_printf(mon, "%15s %5d %5d %5d\n",
327 inet_ntoa(dst_addr), ntohs(dst_port),
328 so->so_rcv.sb_cc, so->so_snd.sb_cc);
329 }
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330
331 for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
f293d8b1 332 snprintf(buf, sizeof(buf), " ICMP[%d sec]",
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333 (so->so_expire - curtime) / 1000);
334 src.sin_addr = so->so_laddr;
335 dst_addr = so->so_faddr;
f293d8b1 336 monitor_printf(mon, "%-19s %3d %15s - ", buf, so->s,
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337 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
338 monitor_printf(mon, "%15s - %5d %5d\n", inet_ntoa(dst_addr),
339 so->so_rcv.sb_cc, so->so_snd.sb_cc);
340 }
6dbe553f 341}