File:  [Qemu by Fabrice Bellard] / qemu / slirp / misc.c
Revision 1.1.1.12 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 19:51:41 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu1101, HEAD
qemu 1.1.1

    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: 	const char *argv[256];
  117: 	/* don't want to clobber the original */
  118: 	char *bptr;
  119: 	const char *curarg;
  120: 	int c, i, ret;
  121: 	pid_t pid;
  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: 	pid = fork();
  146: 	switch(pid) {
  147: 	 case -1:
  148: 		lprint("Error: fork failed: %s\n", strerror(errno));
  149: 		close(s);
  150: 		return 0;
  151: 
  152: 	 case 0:
  153:                 setsid();
  154: 
  155: 		/* Set the DISPLAY */
  156:                 getsockname(s, (struct sockaddr *)&addr, &addrlen);
  157:                 close(s);
  158:                 /*
  159:                  * Connect to the socket
  160:                  * XXX If any of these fail, we're in trouble!
  161:                  */
  162:                 s = qemu_socket(AF_INET, SOCK_STREAM, 0);
  163:                 addr.sin_addr = loopback_addr;
  164:                 do {
  165:                     ret = connect(s, (struct sockaddr *)&addr, addrlen);
  166:                 } while (ret < 0 && errno == EINTR);
  167: 
  168: 		dup2(s, 0);
  169: 		dup2(s, 1);
  170: 		dup2(s, 2);
  171: 		for (s = getdtablesize() - 1; s >= 3; s--)
  172: 		   close(s);
  173: 
  174: 		i = 0;
  175: 		bptr = g_strdup(ex); /* No need to free() this */
  176: 		if (do_pty == 1) {
  177: 			/* Setup "slirp.telnetd -x" */
  178: 			argv[i++] = "slirp.telnetd";
  179: 			argv[i++] = "-x";
  180: 			argv[i++] = bptr;
  181: 		} else
  182: 		   do {
  183: 			/* Change the string into argv[] */
  184: 			curarg = bptr;
  185: 			while (*bptr != ' ' && *bptr != (char)0)
  186: 			   bptr++;
  187: 			c = *bptr;
  188: 			*bptr++ = (char)0;
  189: 			argv[i++] = strdup(curarg);
  190: 		   } while (c);
  191: 
  192:                 argv[i] = NULL;
  193: 		execvp(argv[0], (char **)argv);
  194: 
  195: 		/* Ooops, failed, let's tell the user why */
  196:         fprintf(stderr, "Error: execvp of %s failed: %s\n",
  197:                 argv[0], strerror(errno));
  198: 		close(0); close(1); close(2); /* XXX */
  199: 		exit(1);
  200: 
  201: 	 default:
  202: 		qemu_add_child_watch(pid);
  203:                 /*
  204:                  * XXX this could block us...
  205:                  * XXX Should set a timer here, and if accept() doesn't
  206:                  * return after X seconds, declare it a failure
  207:                  * The only reason this will block forever is if socket()
  208:                  * of connect() fail in the child process
  209:                  */
  210:                 do {
  211:                     so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
  212:                 } while (so->s < 0 && errno == EINTR);
  213:                 closesocket(s);
  214:                 opt = 1;
  215:                 setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(int));
  216:                 opt = 1;
  217:                 setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, (char *)&opt, sizeof(int));
  218: 		socket_set_nonblock(so->s);
  219: 
  220: 		/* Append the telnet options now */
  221:                 if (so->so_m != NULL && do_pty == 1)  {
  222: 			sbappend(so, so->so_m);
  223:                         so->so_m = NULL;
  224: 		}
  225: 
  226: 		return 1;
  227: 	}
  228: }
  229: #endif
  230: 
  231: #ifndef HAVE_STRDUP
  232: char *
  233: strdup(str)
  234: 	const char *str;
  235: {
  236: 	char *bptr;
  237: 
  238: 	bptr = (char *)malloc(strlen(str)+1);
  239: 	strcpy(bptr, str);
  240: 
  241: 	return bptr;
  242: }
  243: #endif
  244: 
  245: #include "monitor.h"
  246: 
  247: void lprint(const char *format, ...)
  248: {
  249:     va_list args;
  250: 
  251:     va_start(args, format);
  252:     monitor_vprintf(default_mon, format, args);
  253:     va_end(args);
  254: }
  255: 
  256: void
  257: u_sleep(int usec)
  258: {
  259: 	struct timeval t;
  260: 	fd_set fdset;
  261: 
  262: 	FD_ZERO(&fdset);
  263: 
  264: 	t.tv_sec = 0;
  265: 	t.tv_usec = usec * 1000;
  266: 
  267: 	select(0, &fdset, &fdset, &fdset, &t);
  268: }
  269: 
  270: void slirp_connection_info(Slirp *slirp, Monitor *mon)
  271: {
  272:     const char * const tcpstates[] = {
  273:         [TCPS_CLOSED]       = "CLOSED",
  274:         [TCPS_LISTEN]       = "LISTEN",
  275:         [TCPS_SYN_SENT]     = "SYN_SENT",
  276:         [TCPS_SYN_RECEIVED] = "SYN_RCVD",
  277:         [TCPS_ESTABLISHED]  = "ESTABLISHED",
  278:         [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
  279:         [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
  280:         [TCPS_CLOSING]      = "CLOSING",
  281:         [TCPS_LAST_ACK]     = "LAST_ACK",
  282:         [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
  283:         [TCPS_TIME_WAIT]    = "TIME_WAIT",
  284:     };
  285:     struct in_addr dst_addr;
  286:     struct sockaddr_in src;
  287:     socklen_t src_len;
  288:     uint16_t dst_port;
  289:     struct socket *so;
  290:     const char *state;
  291:     char buf[20];
  292: 
  293:     monitor_printf(mon, "  Protocol[State]    FD  Source Address  Port   "
  294:                         "Dest. Address  Port RecvQ SendQ\n");
  295: 
  296:     for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
  297:         if (so->so_state & SS_HOSTFWD) {
  298:             state = "HOST_FORWARD";
  299:         } else if (so->so_tcpcb) {
  300:             state = tcpstates[so->so_tcpcb->t_state];
  301:         } else {
  302:             state = "NONE";
  303:         }
  304:         if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
  305:             src_len = sizeof(src);
  306:             getsockname(so->s, (struct sockaddr *)&src, &src_len);
  307:             dst_addr = so->so_laddr;
  308:             dst_port = so->so_lport;
  309:         } else {
  310:             src.sin_addr = so->so_laddr;
  311:             src.sin_port = so->so_lport;
  312:             dst_addr = so->so_faddr;
  313:             dst_port = so->so_fport;
  314:         }
  315:         snprintf(buf, sizeof(buf), "  TCP[%s]", state);
  316:         monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
  317:                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
  318:                        ntohs(src.sin_port));
  319:         monitor_printf(mon, "%15s %5d %5d %5d\n",
  320:                        inet_ntoa(dst_addr), ntohs(dst_port),
  321:                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
  322:     }
  323: 
  324:     for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
  325:         if (so->so_state & SS_HOSTFWD) {
  326:             snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
  327:             src_len = sizeof(src);
  328:             getsockname(so->s, (struct sockaddr *)&src, &src_len);
  329:             dst_addr = so->so_laddr;
  330:             dst_port = so->so_lport;
  331:         } else {
  332:             snprintf(buf, sizeof(buf), "  UDP[%d sec]",
  333:                          (so->so_expire - curtime) / 1000);
  334:             src.sin_addr = so->so_laddr;
  335:             src.sin_port = so->so_lport;
  336:             dst_addr = so->so_faddr;
  337:             dst_port = so->so_fport;
  338:         }
  339:         monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
  340:                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
  341:                        ntohs(src.sin_port));
  342:         monitor_printf(mon, "%15s %5d %5d %5d\n",
  343:                        inet_ntoa(dst_addr), ntohs(dst_port),
  344:                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
  345:     }
  346: 
  347:     for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
  348:         snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
  349:                      (so->so_expire - curtime) / 1000);
  350:         src.sin_addr = so->so_laddr;
  351:         dst_addr = so->so_faddr;
  352:         monitor_printf(mon, "%-19s %3d %15s  -    ", buf, so->s,
  353:                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
  354:         monitor_printf(mon, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
  355:                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
  356:     }
  357: }

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