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Use C99 flexible array instead of 1-byte trailing array
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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
7df7482b 8#include "qemu/osdep.h"
f0cbd3ec 9#include <slirp.h>
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10#include <libslirp.h>
11
83c9089e 12#include "monitor/monitor.h"
d49b6836 13#include "qemu/error-report.h"
6a1751b7 14#include "qemu/main-loop.h"
f0cbd3ec 15
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16#ifdef DEBUG
17int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
18#endif
19
f0cbd3ec 20inline void
511d2b14 21insque(void *a, void *b)
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22{
23 register struct quehead *element = (struct quehead *) a;
24 register struct quehead *head = (struct quehead *) b;
25 element->qh_link = head->qh_link;
26 head->qh_link = (struct quehead *)element;
27 element->qh_rlink = (struct quehead *)head;
28 ((struct quehead *)(element->qh_link))->qh_rlink
29 = (struct quehead *)element;
30}
31
32inline void
511d2b14 33remque(void *a)
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34{
35 register struct quehead *element = (struct quehead *) a;
36 ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
37 ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
38 element->qh_rlink = NULL;
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39}
40
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41int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
42 struct in_addr addr, int port)
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43{
44 struct ex_list *tmp_ptr;
5fafdf24 45
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46 /* First, check if the port is "bound" */
47 for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
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48 if (port == tmp_ptr->ex_fport &&
49 addr.s_addr == tmp_ptr->ex_addr.s_addr)
50 return -1;
f0cbd3ec 51 }
5fafdf24 52
f0cbd3ec 53 tmp_ptr = *ex_ptr;
2fd5d864 54 *ex_ptr = g_new(struct ex_list, 1);
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55 (*ex_ptr)->ex_fport = port;
56 (*ex_ptr)->ex_addr = addr;
57 (*ex_ptr)->ex_pty = do_pty;
2fd5d864 58 (*ex_ptr)->ex_exec = (do_pty == 3) ? exec : g_strdup(exec);
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59 (*ex_ptr)->ex_next = tmp_ptr;
60 return 0;
61}
62
63#ifndef HAVE_STRERROR
64
65/*
66 * For systems with no strerror
67 */
68
69extern int sys_nerr;
70extern char *sys_errlist[];
71
72char *
73strerror(error)
74 int error;
75{
76 if (error < sys_nerr)
77 return sys_errlist[error];
78 else
79 return "Unknown error.";
80}
81
82#endif
83
84
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85#ifdef _WIN32
86
87int
9634d903 88fork_exec(struct socket *so, const char *ex, int do_pty)
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89{
90 /* not implemented */
91 return 0;
92}
93
94#else
95
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96/*
97 * XXX This is ugly
98 * We create and bind a socket, then fork off to another
99 * process, which connects to this socket, after which we
100 * exec the wanted program. If something (strange) happens,
101 * the accept() call could block us forever.
5fafdf24 102 *
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103 * do_pty = 0 Fork/exec inetd style
104 * do_pty = 1 Fork/exec using slirp.telnetd
105 * do_ptr = 2 Fork/exec using pty
106 */
107int
9634d903 108fork_exec(struct socket *so, const char *ex, int do_pty)
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109{
110 int s;
111 struct sockaddr_in addr;
242acf3a 112 socklen_t addrlen = sizeof(addr);
f0cbd3ec 113 int opt;
7ccfb2eb 114 const char *argv[256];
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115 /* don't want to clobber the original */
116 char *bptr;
9634d903 117 const char *curarg;
7b91a172 118 int c, i, ret;
4d54ec78 119 pid_t pid;
5fafdf24 120
f0cbd3ec 121 DEBUG_CALL("fork_exec");
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122 DEBUG_ARG("so = %p", so);
123 DEBUG_ARG("ex = %p", ex);
124 DEBUG_ARG("do_pty = %x", do_pty);
5fafdf24 125
f0cbd3ec 126 if (do_pty == 2) {
3f9b2b1f 127 return 0;
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128 } else {
129 addr.sin_family = AF_INET;
130 addr.sin_port = 0;
131 addr.sin_addr.s_addr = INADDR_ANY;
3b46e624 132
40ff6d7e 133 if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
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134 bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
135 listen(s, 1) < 0) {
02d16089 136 error_report("Error: inet socket: %s", strerror(errno));
379ff53d 137 closesocket(s);
3b46e624 138
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139 return 0;
140 }
141 }
5fafdf24 142
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143 pid = fork();
144 switch(pid) {
f0cbd3ec 145 case -1:
02d16089 146 error_report("Error: fork failed: %s", strerror(errno));
f0cbd3ec 147 close(s);
f0cbd3ec 148 return 0;
3b46e624 149
f0cbd3ec 150 case 0:
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151 setsid();
152
f0cbd3ec 153 /* Set the DISPLAY */
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154 getsockname(s, (struct sockaddr *)&addr, &addrlen);
155 close(s);
156 /*
157 * Connect to the socket
158 * XXX If any of these fail, we're in trouble!
159 */
160 s = qemu_socket(AF_INET, SOCK_STREAM, 0);
161 addr.sin_addr = loopback_addr;
162 do {
163 ret = connect(s, (struct sockaddr *)&addr, addrlen);
164 } while (ret < 0 && errno == EINTR);
3b46e624 165
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166 dup2(s, 0);
167 dup2(s, 1);
168 dup2(s, 2);
9634d903 169 for (s = getdtablesize() - 1; s >= 3; s--)
f0cbd3ec 170 close(s);
3b46e624 171
f0cbd3ec 172 i = 0;
7267c094 173 bptr = g_strdup(ex); /* No need to free() this */
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174 if (do_pty == 1) {
175 /* Setup "slirp.telnetd -x" */
176 argv[i++] = "slirp.telnetd";
177 argv[i++] = "-x";
178 argv[i++] = bptr;
179 } else
180 do {
181 /* Change the string into argv[] */
182 curarg = bptr;
183 while (*bptr != ' ' && *bptr != (char)0)
184 bptr++;
185 c = *bptr;
186 *bptr++ = (char)0;
2fd5d864 187 argv[i++] = g_strdup(curarg);
f0cbd3ec 188 } while (c);
3b46e624 189
511d2b14 190 argv[i] = NULL;
7ccfb2eb 191 execvp(argv[0], (char **)argv);
3b46e624 192
f0cbd3ec 193 /* Ooops, failed, let's tell the user why */
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194 fprintf(stderr, "Error: execvp of %s failed: %s\n",
195 argv[0], strerror(errno));
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196 close(0); close(1); close(2); /* XXX */
197 exit(1);
3b46e624 198
f0cbd3ec 199 default:
4d54ec78 200 qemu_add_child_watch(pid);
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201 /*
202 * XXX this could block us...
203 * XXX Should set a timer here, and if accept() doesn't
204 * return after X seconds, declare it a failure
205 * The only reason this will block forever is if socket()
206 * of connect() fail in the child process
207 */
208 do {
209 so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
210 } while (so->s < 0 && errno == EINTR);
211 closesocket(s);
aad1239a 212 socket_set_fast_reuse(so->s);
9f1134d4 213 opt = 1;
9957fc7f 214 qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
f9e8cacc 215 qemu_set_nonblock(so->s);
3b46e624 216
f0cbd3ec 217 /* Append the telnet options now */
511d2b14 218 if (so->so_m != NULL && do_pty == 1) {
f0cbd3ec 219 sbappend(so, so->so_m);
511d2b14 220 so->so_m = NULL;
f0cbd3ec 221 }
3b46e624 222
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223 return 1;
224 }
225}
226#endif
227
9f8bd042 228void slirp_connection_info(Slirp *slirp, Monitor *mon)
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229{
230 const char * const tcpstates[] = {
231 [TCPS_CLOSED] = "CLOSED",
232 [TCPS_LISTEN] = "LISTEN",
233 [TCPS_SYN_SENT] = "SYN_SENT",
234 [TCPS_SYN_RECEIVED] = "SYN_RCVD",
235 [TCPS_ESTABLISHED] = "ESTABLISHED",
236 [TCPS_CLOSE_WAIT] = "CLOSE_WAIT",
237 [TCPS_FIN_WAIT_1] = "FIN_WAIT_1",
238 [TCPS_CLOSING] = "CLOSING",
239 [TCPS_LAST_ACK] = "LAST_ACK",
240 [TCPS_FIN_WAIT_2] = "FIN_WAIT_2",
241 [TCPS_TIME_WAIT] = "TIME_WAIT",
242 };
243 struct in_addr dst_addr;
244 struct sockaddr_in src;
245 socklen_t src_len;
246 uint16_t dst_port;
247 struct socket *so;
248 const char *state;
249 char buf[20];
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250
251 monitor_printf(mon, " Protocol[State] FD Source Address Port "
252 "Dest. Address Port RecvQ SendQ\n");
253
460fec67 254 for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
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255 if (so->so_state & SS_HOSTFWD) {
256 state = "HOST_FORWARD";
257 } else if (so->so_tcpcb) {
258 state = tcpstates[so->so_tcpcb->t_state];
259 } else {
260 state = "NONE";
261 }
262 if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
263 src_len = sizeof(src);
264 getsockname(so->s, (struct sockaddr *)&src, &src_len);
265 dst_addr = so->so_laddr;
266 dst_port = so->so_lport;
267 } else {
268 src.sin_addr = so->so_laddr;
269 src.sin_port = so->so_lport;
270 dst_addr = so->so_faddr;
271 dst_port = so->so_fport;
272 }
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273 snprintf(buf, sizeof(buf), " TCP[%s]", state);
274 monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
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275 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
276 ntohs(src.sin_port));
277 monitor_printf(mon, "%15s %5d %5d %5d\n",
278 inet_ntoa(dst_addr), ntohs(dst_port),
279 so->so_rcv.sb_cc, so->so_snd.sb_cc);
280 }
281
460fec67 282 for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
6dbe553f 283 if (so->so_state & SS_HOSTFWD) {
f293d8b1 284 snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
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285 src_len = sizeof(src);
286 getsockname(so->s, (struct sockaddr *)&src, &src_len);
287 dst_addr = so->so_laddr;
288 dst_port = so->so_lport;
289 } else {
f293d8b1 290 snprintf(buf, sizeof(buf), " UDP[%d sec]",
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291 (so->so_expire - curtime) / 1000);
292 src.sin_addr = so->so_laddr;
293 src.sin_port = so->so_lport;
294 dst_addr = so->so_faddr;
295 dst_port = so->so_fport;
296 }
f293d8b1 297 monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
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298 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
299 ntohs(src.sin_port));
300 monitor_printf(mon, "%15s %5d %5d %5d\n",
301 inet_ntoa(dst_addr), ntohs(dst_port),
302 so->so_rcv.sb_cc, so->so_snd.sb_cc);
303 }
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304
305 for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
f293d8b1 306 snprintf(buf, sizeof(buf), " ICMP[%d sec]",
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307 (so->so_expire - curtime) / 1000);
308 src.sin_addr = so->so_laddr;
309 dst_addr = so->so_faddr;
f293d8b1 310 monitor_printf(mon, "%-19s %3d %15s - ", buf, so->s,
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311 src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
312 monitor_printf(mon, "%15s - %5d %5d\n", inet_ntoa(dst_addr),
313 so->so_rcv.sb_cc, so->so_snd.sb_cc);
314 }
6dbe553f 315}