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