LXR qemu/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
  16int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
  17#endif
  18
  19inline void
  20insque(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
  31inline void
  32remque(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
  40int 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
  65int
  66fork_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 */
  85int
  86fork_exec(struct socket *so, const char *ex, int do_pty)
  87{
  88        int s, cs;
  89        struct sockaddr_in addr, csaddr;
  90        socklen_t addrlen = sizeof(addr);
  91        socklen_t csaddrlen = sizeof(csaddr);
  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                        if (s >= 0) {
 117                            closesocket(s);
 118                        }
 119
 120                        return 0;
 121                }
 122        }
 123
 124        if (getsockname(s, (struct sockaddr *)&csaddr, &csaddrlen) < 0) {
 125            closesocket(s);
 126            return 0;
 127        }
 128        cs = qemu_socket(AF_INET, SOCK_STREAM, 0);
 129        if (cs < 0) {
 130            closesocket(s);
 131            return 0;
 132        }
 133        csaddr.sin_addr = loopback_addr;
 134        /*
 135         * This connect won't block because we've already listen()ed on
 136         * the server end (even though we won't accept() the connection
 137         * until later on).
 138         */
 139        do {
 140            ret = connect(cs, (struct sockaddr *)&csaddr, csaddrlen);
 141        } while (ret < 0 && errno == EINTR);
 142        if (ret < 0) {
 143            closesocket(s);
 144            closesocket(cs);
 145            return 0;
 146        }
 147
 148        pid = fork();
 149        switch(pid) {
 150         case -1:
 151                error_report("Error: fork failed: %s", strerror(errno));
 152                closesocket(cs);
 153                close(s);
 154                return 0;
 155
 156         case 0:
 157                setsid();
 158
 159                /* Set the DISPLAY */
 160                close(s);
 161                dup2(cs, 0);
 162                dup2(cs, 1);
 163                dup2(cs, 2);
 164                for (s = getdtablesize() - 1; s >= 3; s--)
 165                   close(s);
 166
 167                i = 0;
 168                bptr = g_strdup(ex); /* No need to free() this */
 169                if (do_pty == 1) {
 170                        /* Setup "slirp.telnetd -x" */
 171                        argv[i++] = "slirp.telnetd";
 172                        argv[i++] = "-x";
 173                        argv[i++] = bptr;
 174                } else
 175                   do {
 176                        /* Change the string into argv[] */
 177                        curarg = bptr;
 178                        while (*bptr != ' ' && *bptr != (char)0)
 179                           bptr++;
 180                        c = *bptr;
 181                        *bptr++ = (char)0;
 182                        argv[i++] = g_strdup(curarg);
 183                   } while (c);
 184
 185                argv[i] = NULL;
 186                execvp(argv[0], (char **)argv);
 187
 188                /* Ooops, failed, let's tell the user why */
 189        fprintf(stderr, "Error: execvp of %s failed: %s\n",
 190                argv[0], strerror(errno));
 191                close(0); close(1); close(2); /* XXX */
 192                exit(1);
 193
 194         default:
 195                qemu_add_child_watch(pid);
 196                closesocket(cs);
 197                /*
 198                 * This should never block, because we already connect()ed
 199                 * on the child end before we forked.
 200                 */
 201                do {
 202                    so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
 203                } while (so->s < 0 && errno == EINTR);
 204                closesocket(s);
 205                socket_set_fast_reuse(so->s);
 206                opt = 1;
 207                qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
 208                qemu_set_nonblock(so->s);
 209
 210                /* Append the telnet options now */
 211                if (so->so_m != NULL && do_pty == 1)  {
 212                        sbappend(so, so->so_m);
 213                        so->so_m = NULL;
 214                }
 215
 216                return 1;
 217        }
 218}
 219#endif
 220
 221void slirp_connection_info(Slirp *slirp, Monitor *mon)
 222{
 223    const char * const tcpstates[] = {
 224        [TCPS_CLOSED]       = "CLOSED",
 225        [TCPS_LISTEN]       = "LISTEN",
 226        [TCPS_SYN_SENT]     = "SYN_SENT",
 227        [TCPS_SYN_RECEIVED] = "SYN_RCVD",
 228        [TCPS_ESTABLISHED]  = "ESTABLISHED",
 229        [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
 230        [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
 231        [TCPS_CLOSING]      = "CLOSING",
 232        [TCPS_LAST_ACK]     = "LAST_ACK",
 233        [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
 234        [TCPS_TIME_WAIT]    = "TIME_WAIT",
 235    };
 236    struct in_addr dst_addr;
 237    struct sockaddr_in src;
 238    socklen_t src_len;
 239    uint16_t dst_port;
 240    struct socket *so;
 241    const char *state;
 242    char buf[20];
 243
 244    monitor_printf(mon, "  Protocol[State]    FD  Source Address  Port   "
 245                        "Dest. Address  Port RecvQ SendQ\n");
 246
 247    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
 248        if (so->so_state & SS_HOSTFWD) {
 249            state = "HOST_FORWARD";
 250        } else if (so->so_tcpcb) {
 251            state = tcpstates[so->so_tcpcb->t_state];
 252        } else {
 253            state = "NONE";
 254        }
 255        if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
 256            src_len = sizeof(src);
 257            getsockname(so->s, (struct sockaddr *)&src, &src_len);
 258            dst_addr = so->so_laddr;
 259            dst_port = so->so_lport;
 260        } else {
 261            src.sin_addr = so->so_laddr;
 262            src.sin_port = so->so_lport;
 263            dst_addr = so->so_faddr;
 264            dst_port = so->so_fport;
 265        }
 266        snprintf(buf, sizeof(buf), "  TCP[%s]", state);
 267        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
 268                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 269                       ntohs(src.sin_port));
 270        monitor_printf(mon, "%15s %5d %5d %5d\n",
 271                       inet_ntoa(dst_addr), ntohs(dst_port),
 272                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 273    }
 274
 275    for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
 276        if (so->so_state & SS_HOSTFWD) {
 277            snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
 278            src_len = sizeof(src);
 279            getsockname(so->s, (struct sockaddr *)&src, &src_len);
 280            dst_addr = so->so_laddr;
 281            dst_port = so->so_lport;
 282        } else {
 283            snprintf(buf, sizeof(buf), "  UDP[%d sec]",
 284                         (so->so_expire - curtime) / 1000);
 285            src.sin_addr = so->so_laddr;
 286            src.sin_port = so->so_lport;
 287            dst_addr = so->so_faddr;
 288            dst_port = so->so_fport;
 289        }
 290        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
 291                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 292                       ntohs(src.sin_port));
 293        monitor_printf(mon, "%15s %5d %5d %5d\n",
 294                       inet_ntoa(dst_addr), ntohs(dst_port),
 295                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 296    }
 297
 298    for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
 299        snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
 300                     (so->so_expire - curtime) / 1000);
 301        src.sin_addr = so->so_laddr;
 302        dst_addr = so->so_faddr;
 303        monitor_printf(mon, "%-19s %3d %15s  -    ", buf, so->s,
 304                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
 305        monitor_printf(mon, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
 306                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 307    }
 308}
 309