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 "qemu/error-report.h"
  12 #include "qemu/main-loop.h"
  13
  14 inline void
  15 insque(void *a, void *b)
  16 {
  17         register struct quehead *element = (struct quehead *) a;
  18         register struct quehead *head = (struct quehead *) b;
  19         element->qh_link = head->qh_link;
  20         head->qh_link = (struct quehead *)element;
  21         element->qh_rlink = (struct quehead *)head;
  22         ((struct quehead *)(element->qh_link))->qh_rlink
  23         = (struct quehead *)element;
  24 }
  25
  26 inline void
  27 remque(void *a)
  28 {
  29   register struct quehead *element = (struct quehead *) a;
  30   ((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
  31   ((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
  32   element->qh_rlink = NULL;
  33 }
  34
  35 int add_exec(struct gfwd_list **ex_ptr, void *chardev, const char *cmdline,
  36              struct in_addr addr, int port)
  37 {
  38         struct gfwd_list *tmp_ptr;
  39
  40         tmp_ptr = *ex_ptr;
  41         *ex_ptr = g_new0(struct gfwd_list, 1);
  42         (*ex_ptr)->ex_fport = port;
  43         (*ex_ptr)->ex_addr = addr;
  44         if (chardev) {
  45                 (*ex_ptr)->ex_chardev = chardev;
  46         } else {
  47                 (*ex_ptr)->ex_exec = g_strdup(cmdline);
  48         }
  49         (*ex_ptr)->ex_next = tmp_ptr;
  50         return 0;
  51 }
  52
  53
  54 static int
  55 slirp_socketpair_with_oob(int sv[2])
  56 {
  57     struct sockaddr_in addr = {
  58         .sin_family = AF_INET,
  59         .sin_port = 0,
  60         .sin_addr.s_addr = INADDR_ANY,
  61     };
  62     socklen_t addrlen = sizeof(addr);
  63     int ret, s;
  64
  65     sv[1] = -1;
  66     s = qemu_socket(AF_INET, SOCK_STREAM, 0);
  67     if (s < 0 || bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
  68         listen(s, 1) < 0 ||
  69         getsockname(s, (struct sockaddr *)&addr, &addrlen) < 0) {
  70         goto err;
  71     }
  72
  73     sv[1] = qemu_socket(AF_INET, SOCK_STREAM, 0);
  74     if (sv[1] < 0) {
  75         goto err;
  76     }
  77     /*
  78      * This connect won't block because we've already listen()ed on
  79      * the server end (even though we won't accept() the connection
  80      * until later on).
  81      */
  82     do {
  83         ret = connect(sv[1], (struct sockaddr *)&addr, addrlen);
  84     } while (ret < 0 && errno == EINTR);
  85     if (ret < 0) {
  86         goto err;
  87     }
  88
  89     do {
  90         sv[0] = accept(s, (struct sockaddr *)&addr, &addrlen);
  91     } while (sv[0] < 0 && errno == EINTR);
  92     if (sv[0] < 0) {
  93         goto err;
  94     }
  95
  96     closesocket(s);
  97     return 0;
  98
  99 err:
 100     g_critical("slirp_socketpair(): %s", strerror(errno));
 101     if (s >= 0) {
 102         closesocket(s);
 103     }
 104     if (sv[1] >= 0) {
 105         closesocket(sv[1]);
 106     }
 107     return -1;
 108 }
 109
 110 static void
 111 fork_exec_child_setup(gpointer data)
 112 {
 113 #ifndef _WIN32
 114     setsid();
 115 #endif
 116 }
 117
 118 int
 119 fork_exec(struct socket *so, const char *ex)
 120 {
 121     GError *err = NULL;
 122     char **argv;
 123     int opt, sp[2];
 124
 125     DEBUG_CALL("fork_exec");
 126     DEBUG_ARG("so = %p", so);
 127     DEBUG_ARG("ex = %p", ex);
 128
 129     if (slirp_socketpair_with_oob(sp) < 0) {
 130         return 0;
 131     }
 132
 133     argv = g_strsplit(ex, " ", -1);
 134     g_spawn_async_with_fds(NULL /* cwd */,
 135                            argv,
 136                            NULL /* env */,
 137                            G_SPAWN_SEARCH_PATH,
 138                            fork_exec_child_setup, NULL /* data */,
 139                            NULL /* child_pid */,
 140                            sp[1], sp[1], sp[1],
 141                            &err);
 142     g_strfreev(argv);
 143
 144     if (err) {
 145         g_critical("fork_exec: %s", err->message);
 146         g_error_free(err);
 147         closesocket(sp[0]);
 148         closesocket(sp[1]);
 149         return 0;
 150     }
 151
 152     so->s = sp[0];
 153     closesocket(sp[1]);
 154     socket_set_fast_reuse(so->s);
 155     opt = 1;
 156     qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
 157     qemu_set_nonblock(so->s);
 158     return 1;
 159 }
 160
 161 char *slirp_connection_info(Slirp *slirp)
 162 {
 163     GString *str = g_string_new(NULL);
 164     const char * const tcpstates[] = {
 165         [TCPS_CLOSED]       = "CLOSED",
 166         [TCPS_LISTEN]       = "LISTEN",
 167         [TCPS_SYN_SENT]     = "SYN_SENT",
 168         [TCPS_SYN_RECEIVED] = "SYN_RCVD",
 169         [TCPS_ESTABLISHED]  = "ESTABLISHED",
 170         [TCPS_CLOSE_WAIT]   = "CLOSE_WAIT",
 171         [TCPS_FIN_WAIT_1]   = "FIN_WAIT_1",
 172         [TCPS_CLOSING]      = "CLOSING",
 173         [TCPS_LAST_ACK]     = "LAST_ACK",
 174         [TCPS_FIN_WAIT_2]   = "FIN_WAIT_2",
 175         [TCPS_TIME_WAIT]    = "TIME_WAIT",
 176     };
 177     struct in_addr dst_addr;
 178     struct sockaddr_in src;
 179     socklen_t src_len;
 180     uint16_t dst_port;
 181     struct socket *so;
 182     const char *state;
 183     char buf[20];
 184
 185     g_string_append_printf(str,
 186         "  Protocol[State]    FD  Source Address  Port   "
 187         "Dest. Address  Port RecvQ SendQ\n");
 188
 189     for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
 190         if (so->so_state & SS_HOSTFWD) {
 191             state = "HOST_FORWARD";
 192         } else if (so->so_tcpcb) {
 193             state = tcpstates[so->so_tcpcb->t_state];
 194         } else {
 195             state = "NONE";
 196         }
 197         if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
 198             src_len = sizeof(src);
 199             getsockname(so->s, (struct sockaddr *)&src, &src_len);
 200             dst_addr = so->so_laddr;
 201             dst_port = so->so_lport;
 202         } else {
 203             src.sin_addr = so->so_laddr;
 204             src.sin_port = so->so_lport;
 205             dst_addr = so->so_faddr;
 206             dst_port = so->so_fport;
 207         }
 208         snprintf(buf, sizeof(buf), "  TCP[%s]", state);
 209         g_string_append_printf(str, "%-19s %3d %15s %5d ", buf, so->s,
 210                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 211                        ntohs(src.sin_port));
 212         g_string_append_printf(str, "%15s %5d %5d %5d\n",
 213                        inet_ntoa(dst_addr), ntohs(dst_port),
 214                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
 215     }
 216
 217     for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
 218         if (so->so_state & SS_HOSTFWD) {
 219             snprintf(buf, sizeof(buf), "  UDP[HOST_FORWARD]");
 220             src_len = sizeof(src);
 221             getsockname(so->s, (struct sockaddr *)&src, &src_len);
 222             dst_addr = so->so_laddr;
 223             dst_port = so->so_lport;
 224         } else {
 225             snprintf(buf, sizeof(buf), "  UDP[%d sec]",
 226                          (so->so_expire - curtime) / 1000);
 227             src.sin_addr = so->so_laddr;
 228             src.sin_port = so->so_lport;
 229             dst_addr = so->so_faddr;
 230             dst_port = so->so_fport;
 231         }
 232         g_string_append_printf(str, "%-19s %3d %15s %5d ", buf, so->s,
 233                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
 234                        ntohs(src.sin_port));
 235         g_string_append_printf(str, "%15s %5d %5d %5d\n",
 236                        inet_ntoa(dst_addr), ntohs(dst_port),
 237                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
 238     }
 239
 240     for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
 241         snprintf(buf, sizeof(buf), "  ICMP[%d sec]",
 242                      (so->so_expire - curtime) / 1000);
 243         src.sin_addr = so->so_laddr;
 244         dst_addr = so->so_faddr;
 245         g_string_append_printf(str, "%-19s %3d %15s  -    ", buf, so->s,
 246                        src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
 247         g_string_append_printf(str, "%15s  -    %5d %5d\n", inet_ntoa(dst_addr),
 248                        so->so_rcv.sb_cc, so->so_snd.sb_cc);
 249     }
 250
 251     return g_string_free(str, FALSE);
 252 }