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 }