File:  [Qemu by Fabrice Bellard] / qemu / slirp / misc.c
Revision 1.1.1.11 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 19:31:04 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu1001, HEAD
qemu 1.0.1

    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:         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: 	pid_t pid;
  123: 
  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);
  128: 
  129: 	if (do_pty == 2) {
  130:                 return 0;
  131: 	} else {
  132: 		addr.sin_family = AF_INET;
  133: 		addr.sin_port = 0;
  134: 		addr.sin_addr.s_addr = INADDR_ANY;
  135: 
  136: 		if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
  137: 		    bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
  138: 		    listen(s, 1) < 0) {
  139: 			lprint("Error: inet socket: %s\n", strerror(errno));
  140: 			closesocket(s);
  141: 
  142: 			return 0;
  143: 		}
  144: 	}
  145: 
  146: 	pid = fork();
  147: 	switch(pid) {
  148: 	 case -1:
  149: 		lprint("Error: fork failed: %s\n", strerror(errno));
  150: 		close(s);
  151: 		if (do_pty == 2)
  152: 		   close(master);
  153: 		return 0;
  154: 
  155: 	 case 0:
  156:                 setsid();
  157: 
  158: 		/* Set the DISPLAY */
  159: 		if (do_pty == 2) {
  160: 			(void) close(master);
  161: #ifdef TIOCSCTTY /* XXXXX */
  162: 			ioctl(s, TIOCSCTTY, (char *)NULL);
  163: #endif
  164: 		} else {
  165: 			getsockname(s, (struct sockaddr *)&addr, &addrlen);
  166: 			close(s);
  167: 			/*
  168: 			 * Connect to the socket
  169: 			 * XXX If any of these fail, we're in trouble!
  170: 	 		 */
  171: 			s = qemu_socket(AF_INET, SOCK_STREAM, 0);
  172: 			addr.sin_addr = loopback_addr;
  173:                         do {
  174:                             ret = connect(s, (struct sockaddr *)&addr, addrlen);
  175:                         } while (ret < 0 && errno == EINTR);
  176: 		}
  177: 
  178: 		dup2(s, 0);
  179: 		dup2(s, 1);
  180: 		dup2(s, 2);
  181: 		for (s = getdtablesize() - 1; s >= 3; s--)
  182: 		   close(s);
  183: 
  184: 		i = 0;
  185: 		bptr = g_strdup(ex); /* No need to free() this */
  186: 		if (do_pty == 1) {
  187: 			/* Setup "slirp.telnetd -x" */
  188: 			argv[i++] = "slirp.telnetd";
  189: 			argv[i++] = "-x";
  190: 			argv[i++] = bptr;
  191: 		} else
  192: 		   do {
  193: 			/* Change the string into argv[] */
  194: 			curarg = bptr;
  195: 			while (*bptr != ' ' && *bptr != (char)0)
  196: 			   bptr++;
  197: 			c = *bptr;
  198: 			*bptr++ = (char)0;
  199: 			argv[i++] = strdup(curarg);
  200: 		   } while (c);
  201: 
  202:                 argv[i] = NULL;
  203: 		execvp(argv[0], (char **)argv);
  204: 
  205: 		/* Ooops, failed, let's tell the user why */
  206:         fprintf(stderr, "Error: execvp of %s failed: %s\n",
  207:                 argv[0], strerror(errno));
  208: 		close(0); close(1); close(2); /* XXX */
  209: 		exit(1);
  210: 
  211: 	 default:
  212: 		qemu_add_child_watch(pid);
  213: 		if (do_pty == 2) {
  214: 			close(s);
  215: 			so->s = master;
  216: 		} else {
  217: 			/*
  218: 			 * XXX this could block us...
  219: 			 * XXX Should set a timer here, and if accept() doesn't
  220: 		 	 * return after X seconds, declare it a failure
  221: 		 	 * The only reason this will block forever is if socket()
  222: 		 	 * of connect() fail in the child process
  223: 		 	 */
  224:                         do {
  225:                             so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
  226:                         } while (so->s < 0 && errno == EINTR);
  227:                         closesocket(s);
  228: 			opt = 1;
  229: 			setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
  230: 			opt = 1;
  231: 			setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
  232: 		}
  233: 		fd_nonblock(so->s);
  234: 
  235: 		/* Append the telnet options now */
  236:                 if (so->so_m != NULL && do_pty == 1)  {
  237: 			sbappend(so, so->so_m);
  238:                         so->so_m = NULL;
  239: 		}
  240: 
  241: 		return 1;
  242: 	}
  243: }
  244: #endif
  245: 
  246: #ifndef HAVE_STRDUP
  247: char *
  248: strdup(str)
  249: 	const char *str;
  250: {
  251: 	char *bptr;
  252: 
  253: 	bptr = (char *)malloc(strlen(str)+1);
  254: 	strcpy(bptr, str);
  255: 
  256: 	return bptr;
  257: }
  258: #endif
  259: 
  260: #include "monitor.h"
  261: 
  262: void lprint(const char *format, ...)
  263: {
  264:     va_list args;
  265: 
  266:     va_start(args, format);
  267:     monitor_vprintf(default_mon, format, args);
  268:     va_end(args);
  269: }
  270: 
  271: void
  272: u_sleep(int usec)
  273: {
  274: 	struct timeval t;
  275: 	fd_set fdset;
  276: 
  277: 	FD_ZERO(&fdset);
  278: 
  279: 	t.tv_sec = 0;
  280: 	t.tv_usec = usec * 1000;
  281: 
  282: 	select(0, &fdset, &fdset, &fdset, &t);
  283: }
  284: 
  285: /*
  286:  * Set fd blocking and non-blocking
  287:  */
  288: 
  289: void
  290: fd_nonblock(int fd)
  291: {
  292: #ifdef FIONBIO
  293: #ifdef _WIN32
  294:         unsigned long opt = 1;
  295: #else
  296:         int opt = 1;
  297: #endif
  298: 
  299: 	ioctlsocket(fd, FIONBIO, &opt);
  300: #else
  301: 	int opt;
  302: 
  303: 	opt = fcntl(fd, F_GETFL, 0);
  304: 	opt |= O_NONBLOCK;
  305: 	fcntl(fd, F_SETFL, opt);
  306: #endif
  307: }
  308: 
  309: void
  310: fd_block(int fd)
  311: {
  312: #ifdef FIONBIO
  313: #ifdef _WIN32
  314:         unsigned long opt = 0;
  315: #else
  316: 	int opt = 0;
  317: #endif
  318: 
  319: 	ioctlsocket(fd, FIONBIO, &opt);
  320: #else
  321: 	int opt;
  322: 
  323: 	opt = fcntl(fd, F_GETFL, 0);
  324: 	opt &= ~O_NONBLOCK;
  325: 	fcntl(fd, F_SETFL, opt);
  326: #endif
  327: }
  328: 
  329: void slirp_connection_info(Slirp *slirp, Monitor *mon)
  330: {
  331:     const char * const tcpstates[] = {
  332:         [TCPS_CLOSED]       = "CLOSED",
  333:         [TCPS_LISTEN]       = "LISTEN",
  334:         [TCPS_SYN_SENT]     = "SYN_SENT",
  335:         [TCPS_SYN_RECEIVED] = "SYN_RCVD",
  336:         [TCPS_ESTABLISHED]  = "ESTABLISHED",
  337:         [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
  338:         [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
  339:         [TCPS_CLOSING]      = "CLOSING",
  340:         [TCPS_LAST_ACK]     = "LAST_ACK",
  341:         [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
  342:         [TCPS_TIME_WAIT]    = "TIME_WAIT",
  343:     };
  344:     struct in_addr dst_addr;
  345:     struct sockaddr_in src;
  346:     socklen_t src_len;
  347:     uint16_t dst_port;
  348:     struct socket *so;
  349:     const char *state;
  350:     char buf[20];
  351:     int n;
  352: 
  353:     monitor_printf(mon, "  Protocol[State]    FD  Source Address  Port   "
  354:                         "Dest. Address  Port RecvQ SendQ\n");
  355: 
  356:     for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
  357:         if (so->so_state & SS_HOSTFWD) {
  358:             state = "HOST_FORWARD";
  359:         } else if (so->so_tcpcb) {
  360:             state = tcpstates[so->so_tcpcb->t_state];
  361:         } else {
  362:             state = "NONE";
  363:         }
  364:         if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
  365:             src_len = sizeof(src);
  366:             getsockname(so->s, (struct sockaddr *)&src, &src_len);
  367:             dst_addr = so->so_laddr;
  368:             dst_port = so->so_lport;
  369:         } else {
  370:             src.sin_addr = so->so_laddr;
  371:             src.sin_port = so->so_lport;
  372:             dst_addr = so->so_faddr;
  373:             dst_port = so->so_fport;
  374:         }
  375:         n = snprintf(buf, sizeof(buf), "  TCP[%s]", state);
  376:         memset(&buf[n], ' ', 19 - n);
  377:         buf[19] = 0;
  378:         monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
  379:                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
  380:                        ntohs(src.sin_port));
  381:         monitor_printf(mon, "%15s %5d %5d %5d\n",
  382:                        inet_ntoa(dst_addr), ntohs(dst_port),
  383:                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
  384:     }
  385: 
  386:     for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
  387:         if (so->so_state & SS_HOSTFWD) {
  388:             n = snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
  389:             src_len = sizeof(src);
  390:             getsockname(so->s, (struct sockaddr *)&src, &src_len);
  391:             dst_addr = so->so_laddr;
  392:             dst_port = so->so_lport;
  393:         } else {
  394:             n = snprintf(buf, sizeof(buf), "  UDP[%d sec]",
  395:                          (so->so_expire - curtime) / 1000);
  396:             src.sin_addr = so->so_laddr;
  397:             src.sin_port = so->so_lport;
  398:             dst_addr = so->so_faddr;
  399:             dst_port = so->so_fport;
  400:         }
  401:         memset(&buf[n], ' ', 19 - n);
  402:         buf[19] = 0;
  403:         monitor_printf(mon, "%s %3d %15s %5d ", buf, so->s,
  404:                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
  405:                        ntohs(src.sin_port));
  406:         monitor_printf(mon, "%15s %5d %5d %5d\n",
  407:                        inet_ntoa(dst_addr), ntohs(dst_port),
  408:                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
  409:     }
  410: 
  411:     for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
  412:         n = snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
  413:                      (so->so_expire - curtime) / 1000);
  414:         src.sin_addr = so->so_laddr;
  415:         dst_addr = so->so_faddr;
  416:         memset(&buf[n], ' ', 19 - n);
  417:         buf[19] = 0;
  418:         monitor_printf(mon, "%s %3d %15s  -    ", buf, so->s,
  419:                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
  420:         monitor_printf(mon, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
  421:                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
  422:     }
  423: }

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