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
  13#ifdef DEBUG
  14int slirp_debug = DBG_CALL|DBG_MISC|DBG_ERROR;
  15#endif
  16
  17struct quehead {
  18        struct quehead *qh_link;
  19        struct quehead *qh_rlink;
  20};
  21
  22inline void
  23insque(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
  34inline void
  35remque(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
  43int 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
  71extern int sys_nerr;
  72extern char *sys_errlist[];
  73
  74char *
  75strerror(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
  89int
  90fork_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 */
 109int
 110fork_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        const char *argv[256];
 117        /* don't want to clobber the original */
 118        char *bptr;
 119        const char *curarg;
 120        int c, i, ret;
 121        pid_t pid;
 122
 123        DEBUG_CALL("fork_exec");
 124        DEBUG_ARG("so = %lx", (long)so);
 125        DEBUG_ARG("ex = %lx", (long)ex);
 126        DEBUG_ARG("do_pty = %lx", (long)do_pty);
 127
 128        if (do_pty == 2) {
 129                return 0;
 130        } else {
 131                addr.sin_family = AF_INET;
 132                addr.sin_port = 0;
 133                addr.sin_addr.s_addr = INADDR_ANY;
 134
 135                if ((s = qemu_socket(AF_INET, SOCK_STREAM, 0)) < 0 ||
 136                    bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
 137                    listen(s, 1) < 0) {
 138                        lprint("Error: inet socket: %s\n", strerror(errno));
 139                        closesocket(s);
 140
 141                        return 0;
 142                }
 143        }
 144
 145        pid = fork();
 146        switch(pid) {
 147         case -1:
 148                lprint("Error: fork failed: %s\n", strerror(errno));
 149                close(s);
 150                return 0;
 151
 152         case 0:
 153                setsid();
 154
 155                /* Set the DISPLAY */
 156                getsockname(s, (struct sockaddr *)&addr, &addrlen);
 157                close(s);
 158                /*
 159                 * Connect to the socket
 160                 * XXX If any of these fail, we're in trouble!
 161                 */
 162                s = qemu_socket(AF_INET, SOCK_STREAM, 0);
 163                addr.sin_addr = loopback_addr;
 164                do {
 165                    ret = connect(s, (struct sockaddr *)&addr, addrlen);
 166                } while (ret < 0 && errno == EINTR);
 167
 168                dup2(s, 0);
 169                dup2(s, 1);
 170                dup2(s, 2);
 171                for (s = getdtablesize() - 1; s >= 3; s--)
 172                   close(s);
 173
 174                i = 0;
 175                bptr = g_strdup(ex); /* No need to free() this */
 176                if (do_pty == 1) {
 177                        /* Setup "slirp.telnetd -x" */
 178                        argv[i++] = "slirp.telnetd";
 179                        argv[i++] = "-x";
 180                        argv[i++] = bptr;
 181                } else
 182                   do {
 183                        /* Change the string into argv[] */
 184                        curarg = bptr;
 185                        while (*bptr != ' ' && *bptr != (char)0)
 186                           bptr++;
 187                        c = *bptr;
 188                        *bptr++ = (char)0;
 189                        argv[i++] = strdup(curarg);
 190                   } while (c);
 191
 192                argv[i] = NULL;
 193                execvp(argv[0], (char **)argv);
 194
 195                /* Ooops, failed, let's tell the user why */
 196        fprintf(stderr, "Error: execvp of %s failed: %s\n",
 197                argv[0], strerror(errno));
 198                close(0); close(1); close(2); /* XXX */
 199                exit(1);
 200
 201         default:
 202                qemu_add_child_watch(pid);
 203                /*
 204                 * XXX this could block us...
 205                 * XXX Should set a timer here, and if accept() doesn't
 206                 * return after X seconds, declare it a failure
 207                 * The only reason this will block forever is if socket()
 208                 * of connect() fail in the child process
 209                 */
 210                do {
 211                    so->s = accept(s, (struct sockaddr *)&addr, &addrlen);
 212                } while (so->s < 0 && errno == EINTR);
 213                closesocket(s);
 214                opt = 1;
 215                setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(int));
 216                opt = 1;
 217                setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, (char *)&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
 231#ifndef HAVE_STRDUP
 232char *
 233strdup(str)
 234        const char *str;
 235{
 236        char *bptr;
 237
 238        bptr = (char *)malloc(strlen(str)+1);
 239        strcpy(bptr, str);
 240
 241        return bptr;
 242}
 243#endif
 244
 245#include "monitor/monitor.h"
 246
 247void lprint(const char *format, ...)
 248{
 249    va_list args;
 250
 251    va_start(args, format);
 252    monitor_vprintf(default_mon, format, args);
 253    va_end(args);
 254}
 255
 256void slirp_connection_info(Slirp *slirp, Monitor *mon)
 257{
 258    const char * const tcpstates[] = {
 259        [TCPS_CLOSED]       = "CLOSED",
 260        [TCPS_LISTEN]       = "LISTEN",
 261        [TCPS_SYN_SENT]     = "SYN_SENT",
 262        [TCPS_SYN_RECEIVED] = "SYN_RCVD",
 263        [TCPS_ESTABLISHED]  = "ESTABLISHED",
 264        [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
 265        [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
 266        [TCPS_CLOSING]      = "CLOSING",
 267        [TCPS_LAST_ACK]     = "LAST_ACK",
 268        [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
 269        [TCPS_TIME_WAIT]    = "TIME_WAIT",
 270    };
 271    struct in_addr dst_addr;
 272    struct sockaddr_in src;
 273    socklen_t src_len;
 274    uint16_t dst_port;
 275    struct socket *so;
 276    const char *state;
 277    char buf[20];
 278
 279    monitor_printf(mon, "  Protocol[State]    FD  Source Address  Port   "
 280                        "Dest. Address  Port RecvQ SendQ\n");
 281
 282    for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
 283        if (so->so_state & SS_HOSTFWD) {
 284            state = "HOST_FORWARD";
 285        } else if (so->so_tcpcb) {
 286            state = tcpstates[so->so_tcpcb->t_state];
 287        } else {
 288            state = "NONE";
 289        }
 290        if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
 291            src_len = sizeof(src);
 292            getsockname(so->s, (struct sockaddr *)&src, &src_len);
 293            dst_addr = so->so_laddr;
 294            dst_port = so->so_lport;
 295        } else {
 296            src.sin_addr = so->so_laddr;
 297            src.sin_port = so->so_lport;
 298            dst_addr = so->so_faddr;
 299            dst_port = so->so_fport;
 300        }
 301        snprintf(buf, sizeof(buf), "  TCP[%s]", state);
 302        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
 303                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 304                       ntohs(src.sin_port));
 305        monitor_printf(mon, "%15s %5d %5d %5d\n",
 306                       inet_ntoa(dst_addr), ntohs(dst_port),
 307                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 308    }
 309
 310    for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
 311        if (so->so_state & SS_HOSTFWD) {
 312            snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
 313            src_len = sizeof(src);
 314            getsockname(so->s, (struct sockaddr *)&src, &src_len);
 315            dst_addr = so->so_laddr;
 316            dst_port = so->so_lport;
 317        } else {
 318            snprintf(buf, sizeof(buf), "  UDP[%d sec]",
 319                         (so->so_expire - curtime) / 1000);
 320            src.sin_addr = so->so_laddr;
 321            src.sin_port = so->so_lport;
 322            dst_addr = so->so_faddr;
 323            dst_port = so->so_fport;
 324        }
 325        monitor_printf(mon, "%-19s %3d %15s %5d ", buf, so->s,
 326                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 327                       ntohs(src.sin_port));
 328        monitor_printf(mon, "%15s %5d %5d %5d\n",
 329                       inet_ntoa(dst_addr), ntohs(dst_port),
 330                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 331    }
 332
 333    for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
 334        snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
 335                     (so->so_expire - curtime) / 1000);
 336        src.sin_addr = so->so_laddr;
 337        dst_addr = so->so_faddr;
 338        monitor_printf(mon, "%-19s %3d %15s  -    ", buf, so->s,
 339                       src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
 340        monitor_printf(mon, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
 341                       so->so_rcv.sb_cc, so->so_snd.sb_cc);
 342    }
 343}
 344