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