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 <slirp.h>
   9#include <libslirp.h>
  10
  11#include "monitor/monitor.h"
  12#include "qemu/main-loop.h"
  13
  14#ifdef DEBUG
  15int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
  16#endif
  17
  18struct quehead {
  19        struct quehead *qh_link;
  20        struct quehead *qh_rlink;
  21};
  22
  23inline void
  24insque(void *a, void *b)
  25{
  26        register struct quehead *element = (struct quehead *) a;
  27        register struct quehead *head = (struct quehead *) b;
  28        element->qh_link = head->qh_link;
  29        head->qh_link = (struct quehead *)element;
  30        element->qh_rlink = (struct quehead *)head;
  31        ((struct quehead *)(element->qh_link))->qh_rlink
  32        = (struct quehead *)element;
  33}
  34
  35inline void
  36remque(void *a)
  37{
  38  register struct quehead *element = (struct quehead *) a;
  39  ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
  40  ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
  41  element->qh_rlink = NULL;
  42}
  43
  44int add_exec(struct ex_list **ex_ptr, int do_pty, char *exec,
  45             struct in_addr addr, int port)
  46{
  47        struct ex_list *tmp_ptr;
  48
  49        /* First, check if the port is "bound" */
  50        for (tmp_ptr = *ex_ptr; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
  51                if (port == tmp_ptr->ex_fport &&
  52                    addr.s_addr == tmp_ptr->ex_addr.s_addr)
  53                        return -1;
  54        }
  55
  56        tmp_ptr = *ex_ptr;
  57        *ex_ptr = g_new(struct ex_list, 1);
  58        (*ex_ptr)->ex_fport = port;
  59        (*ex_ptr)->ex_addr = addr;
  60        (*ex_ptr)->ex_pty = do_pty;
  61        (*ex_ptr)->ex_exec = (do_pty == 3) ? exec : g_strdup(exec);
  62        (*ex_ptr)->ex_next = tmp_ptr;
  63        return 0;
  64}
  65
  66#ifndef HAVE_STRERROR
  67
  68/*
  69 * For systems with no strerror
  70 */
  71
  72extern int sys_nerr;
  73extern char *sys_errlist[];
  74
  75char *
  76strerror(error)
  77        int error;
  78{
  79        if (error < sys_nerr)
  80           return sys_errlist[error];
  81        else
  82           return "Unknown error.";
  83}
  84
  85#endif
  86
  87
  88#ifdef _WIN32
  89
  90int
  91fork_exec(struct socket *so, const char *ex, int do_pty)
  92{
  93    /* not implemented */
  94    return 0;
  95}
  96
  97#else
  98
  99/*
 100 * XXX This is ugly
 101 * We create and bind a socket, then fork off to another
 102 * process, which connects to this socket, after which we
 103 * exec the wanted program.  If something (strange) happens,
 104 * the accept() call could block us forever.
 105 *
 106 * do_pty = 0   Fork/exec inetd style
 107 * do_pty = 1   Fork/exec using slirp.telnetd
 108 * do_ptr = 2   Fork/exec using pty
 109 */
 110int
 111fork_exec(struct socket *so, const char *ex, int do_pty)
 112{
 113        int s;
 114        struct sockaddr_in addr;
 115        socklen_t addrlen = sizeof(addr);
 116        int opt;
 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                        error_report("Error: inet socket: %s", strerror(errno));
 140                        closesocket(s);
 141
 142                        return 0;
 143                }
 144        }
 145
 146        pid = fork();
 147        switch(pid) {
 148         case -1:
 149                error_report("Error: fork failed: %s", strerror(errno));
 150                close(s);
 151                return 0;
 152
 153         case 0:
 154                setsid();
 155
 156                /* Set the DISPLAY */
 157                getsockname(s, (struct sockaddr *)&addr, &addrlen);
 158                close(s);
 159                /*
 160                 * Connect to the socket
 161                 * XXX If any of these fail, we're in trouble!
 162                 */
 163                s = qemu_socket(AF_INET, SOCK_STREAM, 0);
 164                addr.sin_addr = loopback_addr;
 165                do {
 166                    ret = connect(s, (struct sockaddr *)&addr, addrlen);
 167                } while (ret < 0 && errno == EINTR);
 168
 169                dup2(s, 0);
 170                dup2(s, 1);
 171                dup2(s, 2);
 172                for (s = getdtablesize() - 1; s >= 3; s--)
 173                   close(s);
 174
 175                i = 0;
 176                bptr = g_strdup(ex); /* No need to free() this */
 177                if (do_pty == 1) {
 178                        /* Setup "slirp.telnetd -x" */
 179                        argv[i++] = "slirp.telnetd";
 180                        argv[i++] = "-x";
 181                        argv[i++] = bptr;
 182                } else
 183                   do {
 184                        /* Change the string into argv[] */
 185                        curarg = bptr;
 186                        while (*bptr != ' ' && *bptr != (char)0)
 187                           bptr++;
 188                        c = *bptr;
 189                        *bptr++ = (char)0;
 190                        argv[i++] = g_strdup(curarg);
 191                   } while (c);
 192
 193                argv[i] = NULL;
 194                execvp(argv[0], (char **)argv);
 195
 196                /* Ooops, failed, let's tell the user why */
 197        fprintf(stderr, "Error: execvp of %s failed: %s\n",
 198                argv[0], strerror(errno));
 199                close(0); close(1); close(2); /* XXX */
 200                exit(1);
 201
 202         default:
 203                qemu_add_child_watch(pid);
 204                /*
 205                 * XXX this could block us...
 206                 * XXX Should set a timer here, and if accept() doesn't
 207                 * return after X seconds, declare it a failure
 208                 * The only reason this will block forever is if socket()
 209                 * of connect() fail in the child process
 210                 */
 211                do {
 212                    so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
 213                } while (so->s < 0 && errno == EINTR);
 214                closesocket(s);
 215                socket_set_fast_reuse(so->s);
 216                opt = 1;
 217                qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
 218                qemu_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
 231void slirp_connection_info(Slirp *slirp, Monitor *mon)
 232{
 233    const char * const tcpstates[] = {
 234        [TCPS_CLOSED]       = "CLOSED",
 235        [TCPS_LISTEN]       = "LISTEN",
 236        [TCPS_SYN_SENT]     = "SYN_SENT",
 237        [TCPS_SYN_RECEIVED] = "SYN_RCVD",
 238        [TCPS_ESTABLISHED]  = "ESTABLISHED",
 239        [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
 240        [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
 241        [TCPS_CLOSING]      = "CLOSING",
 242        [TCPS_LAST_ACK]     = "LAST_ACK",
 243        [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
 244        [TCPS_TIME_WAIT]    = "TIME_WAIT",
 245    };
 246    struct in_addr dst_addr;
 247    struct sockaddr_in src;
 248    socklen_t src_len;
 249    uint16_t dst_port;
 250    struct socket *so;
 251    const char *state;
 252    char buf[20];
 253
 254    monitor_printf(mon, "  Protocol[State]    FD  Source Address  Port   "
 255                        "Dest. Address  Port RecvQ SendQ\n");
 256
 257    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
 258        if (so->so_state & SS_HOSTFWD) {
 259            state = "HOST_FORWARD";
 260        } else if (so->so_tcpcb) {
 261            state = tcpstates[so->so_tcpcb->t_state];
 262        } else {
 263            state = "NONE";
 264        }
 265        if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
 266            src_len = sizeof(src);
 267            getsockname(so->s, (struct sockaddr *)&src, &src_len);
 268            dst_addr = so->so_laddr;
 269            dst_port = so->so_lport;
 270        } else {
 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        snprintf(buf, sizeof(buf), "  TCP[%s]", state);
 277        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
 278                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 279                       ntohs(src.sin_port));
 280        monitor_printf(mon, "%15s %5d %5d %5d\n",
 281                       inet_ntoa(dst_addr), ntohs(dst_port),
 282                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 283    }
 284
 285    for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
 286        if (so->so_state & SS_HOSTFWD) {
 287            snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
 288            src_len = sizeof(src);
 289            getsockname(so->s, (struct sockaddr *)&src, &src_len);
 290            dst_addr = so->so_laddr;
 291            dst_port = so->so_lport;
 292        } else {
 293            snprintf(buf, sizeof(buf), "  UDP[%d sec]",
 294                         (so->so_expire - curtime) / 1000);
 295            src.sin_addr = so->so_laddr;
 296            src.sin_port = so->so_lport;
 297            dst_addr = so->so_faddr;
 298            dst_port = so->so_fport;
 299        }
 300        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
 301                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 302                       ntohs(src.sin_port));
 303        monitor_printf(mon, "%15s %5d %5d %5d\n",
 304                       inet_ntoa(dst_addr), ntohs(dst_port),
 305                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 306    }
 307
 308    for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
 309        snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
 310                     (so->so_expire - curtime) / 1000);
 311        src.sin_addr = so->so_laddr;
 312        dst_addr = so->so_faddr;
 313        monitor_printf(mon, "%-19s %3d %15s  -    ", buf, so->s,
 314                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
 315        monitor_printf(mon, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
 316                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 317    }
 318}
 319