qemu/slirp/misc.c
Marc-André Lureau fdbfba8cbf slirp: remove slirp_ prefix for socket wrappers
QEMU wraps the socket functions in os-win32.h, but in commit
a9d8b3ec43, the header inclusion was dropped,
breaking libslirp on Windows.

There are already a few socket functions that are wrapped in libslirp,
with "slirp_" prefix, but many of them are missing, and we are going
to wrap the missing functions in a second patch.

Using "slirp_" prefix avoids the conflict with socket function #define
wrappers in QEMU os-win32.h, but they are quite intrusive. In the end,
the functions should behave the same as original one, but with errno
being set. To avoid the churn, and potential confusion, remove the
"slirp_" prefix. A series of #undef is necessary until libslirp is
made standalone to prevent the #define conflict with QEMU.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190212160953.29051-2-marcandre.lureau@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
2019-02-12 20:47:42 +01:00

321 lines
9.3 KiB
C

/*
* Copyright (c) 1995 Danny Gasparovski.
*
* Please read the file COPYRIGHT for the
* terms and conditions of the copyright.
*/
#include "slirp.h"
inline void
insque(void *a, void *b)
{
register struct quehead *element = (struct quehead *) a;
register struct quehead *head = (struct quehead *) b;
element->qh_link = head->qh_link;
head->qh_link = (struct quehead *)element;
element->qh_rlink = (struct quehead *)head;
((struct quehead *)(element->qh_link))->qh_rlink
= (struct quehead *)element;
}
inline void
remque(void *a)
{
register struct quehead *element = (struct quehead *) a;
((struct quehead *)(element->qh_link))->qh_rlink = element->qh_rlink;
((struct quehead *)(element->qh_rlink))->qh_link = element->qh_link;
element->qh_rlink = NULL;
}
struct gfwd_list *
add_guestfwd(struct gfwd_list **ex_ptr,
SlirpWriteCb write_cb, void *opaque,
struct in_addr addr, int port)
{
struct gfwd_list *f = g_new0(struct gfwd_list, 1);
f->write_cb = write_cb;
f->opaque = opaque;
f->ex_fport = port;
f->ex_addr = addr;
f->ex_next = *ex_ptr;
*ex_ptr = f;
return f;
}
struct gfwd_list *
add_exec(struct gfwd_list **ex_ptr, const char *cmdline,
struct in_addr addr, int port)
{
struct gfwd_list *f = add_guestfwd(ex_ptr, NULL, NULL, addr, port);
f->ex_exec = g_strdup(cmdline);
return f;
}
static int
slirp_socketpair_with_oob(int sv[2])
{
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = 0,
.sin_addr.s_addr = INADDR_ANY,
};
socklen_t addrlen = sizeof(addr);
int ret, s;
sv[1] = -1;
s = slirp_socket(AF_INET, SOCK_STREAM, 0);
if (s < 0 || bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
listen(s, 1) < 0 ||
getsockname(s, (struct sockaddr *)&addr, &addrlen) < 0) {
goto err;
}
sv[1] = slirp_socket(AF_INET, SOCK_STREAM, 0);
if (sv[1] < 0) {
goto err;
}
/*
* This connect won't block because we've already listen()ed on
* the server end (even though we won't accept() the connection
* until later on).
*/
do {
ret = connect(sv[1], (struct sockaddr *)&addr, addrlen);
} while (ret < 0 && errno == EINTR);
if (ret < 0) {
goto err;
}
do {
sv[0] = accept(s, (struct sockaddr *)&addr, &addrlen);
} while (sv[0] < 0 && errno == EINTR);
if (sv[0] < 0) {
goto err;
}
closesocket(s);
return 0;
err:
g_critical("slirp_socketpair(): %s", strerror(errno));
if (s >= 0) {
closesocket(s);
}
if (sv[1] >= 0) {
closesocket(sv[1]);
}
return -1;
}
static void
fork_exec_child_setup(gpointer data)
{
#ifndef _WIN32
setsid();
#endif
}
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#if !GLIB_CHECK_VERSION(2, 58, 0)
typedef struct SlirpGSpawnFds {
GSpawnChildSetupFunc child_setup;
gpointer user_data;
gint stdin_fd;
gint stdout_fd;
gint stderr_fd;
} SlirpGSpawnFds;
static inline void
slirp_gspawn_fds_setup(gpointer user_data)
{
SlirpGSpawnFds *q = (SlirpGSpawnFds *)user_data;
dup2(q->stdin_fd, 0);
dup2(q->stdout_fd, 1);
dup2(q->stderr_fd, 2);
q->child_setup(q->user_data);
}
#endif
static inline gboolean
g_spawn_async_with_fds_slirp(const gchar *working_directory,
gchar **argv,
gchar **envp,
GSpawnFlags flags,
GSpawnChildSetupFunc child_setup,
gpointer user_data,
GPid *child_pid,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error)
{
#if GLIB_CHECK_VERSION(2, 58, 0)
return g_spawn_async_with_fds(working_directory, argv, envp, flags,
child_setup, user_data,
child_pid, stdin_fd, stdout_fd, stderr_fd,
error);
#else
SlirpGSpawnFds setup = {
.child_setup = child_setup,
.user_data = user_data,
.stdin_fd = stdin_fd,
.stdout_fd = stdout_fd,
.stderr_fd = stderr_fd,
};
return g_spawn_async(working_directory, argv, envp, flags,
slirp_gspawn_fds_setup, &setup,
child_pid, error);
#endif
}
#define g_spawn_async_with_fds(wd, argv, env, f, c, d, p, ifd, ofd, efd, err) \
g_spawn_async_with_fds_slirp(wd, argv, env, f, c, d, p, ifd, ofd, efd, err)
#pragma GCC diagnostic pop
int
fork_exec(struct socket *so, const char *ex)
{
GError *err = NULL;
char **argv;
int opt, sp[2];
DEBUG_CALL("fork_exec");
DEBUG_ARG("so = %p", so);
DEBUG_ARG("ex = %p", ex);
if (slirp_socketpair_with_oob(sp) < 0) {
return 0;
}
argv = g_strsplit(ex, " ", -1);
g_spawn_async_with_fds(NULL /* cwd */,
argv,
NULL /* env */,
G_SPAWN_SEARCH_PATH,
fork_exec_child_setup, NULL /* data */,
NULL /* child_pid */,
sp[1], sp[1], sp[1],
&err);
g_strfreev(argv);
if (err) {
g_critical("fork_exec: %s", err->message);
g_error_free(err);
closesocket(sp[0]);
closesocket(sp[1]);
return 0;
}
so->s = sp[0];
closesocket(sp[1]);
slirp_socket_set_fast_reuse(so->s);
opt = 1;
setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
slirp_set_nonblock(so->s);
so->slirp->cb->register_poll_fd(so->s, so->slirp->opaque);
return 1;
}
char *slirp_connection_info(Slirp *slirp)
{
GString *str = g_string_new(NULL);
const char * const tcpstates[] = {
[TCPS_CLOSED] = "CLOSED",
[TCPS_LISTEN] = "LISTEN",
[TCPS_SYN_SENT] = "SYN_SENT",
[TCPS_SYN_RECEIVED] = "SYN_RCVD",
[TCPS_ESTABLISHED] = "ESTABLISHED",
[TCPS_CLOSE_WAIT] = "CLOSE_WAIT",
[TCPS_FIN_WAIT_1] = "FIN_WAIT_1",
[TCPS_CLOSING] = "CLOSING",
[TCPS_LAST_ACK] = "LAST_ACK",
[TCPS_FIN_WAIT_2] = "FIN_WAIT_2",
[TCPS_TIME_WAIT] = "TIME_WAIT",
};
struct in_addr dst_addr;
struct sockaddr_in src;
socklen_t src_len;
uint16_t dst_port;
struct socket *so;
const char *state;
char buf[20];
g_string_append_printf(str,
" Protocol[State] FD Source Address Port "
"Dest. Address Port RecvQ SendQ\n");
for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
if (so->so_state & SS_HOSTFWD) {
state = "HOST_FORWARD";
} else if (so->so_tcpcb) {
state = tcpstates[so->so_tcpcb->t_state];
} else {
state = "NONE";
}
if (so->so_state & (SS_HOSTFWD | SS_INCOMING)) {
src_len = sizeof(src);
getsockname(so->s, (struct sockaddr *)&src, &src_len);
dst_addr = so->so_laddr;
dst_port = so->so_lport;
} else {
src.sin_addr = so->so_laddr;
src.sin_port = so->so_lport;
dst_addr = so->so_faddr;
dst_port = so->so_fport;
}
snprintf(buf, sizeof(buf), " TCP[%s]", state);
g_string_append_printf(str, "%-19s %3d %15s %5d ", buf, so->s,
src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
ntohs(src.sin_port));
g_string_append_printf(str, "%15s %5d %5d %5d\n",
inet_ntoa(dst_addr), ntohs(dst_port),
so->so_rcv.sb_cc, so->so_snd.sb_cc);
}
for (so = slirp->udb.so_next; so != &slirp->udb; so = so->so_next) {
if (so->so_state & SS_HOSTFWD) {
snprintf(buf, sizeof(buf), " UDP[HOST_FORWARD]");
src_len = sizeof(src);
getsockname(so->s, (struct sockaddr *)&src, &src_len);
dst_addr = so->so_laddr;
dst_port = so->so_lport;
} else {
snprintf(buf, sizeof(buf), " UDP[%d sec]",
(so->so_expire - curtime) / 1000);
src.sin_addr = so->so_laddr;
src.sin_port = so->so_lport;
dst_addr = so->so_faddr;
dst_port = so->so_fport;
}
g_string_append_printf(str, "%-19s %3d %15s %5d ", buf, so->s,
src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*",
ntohs(src.sin_port));
g_string_append_printf(str, "%15s %5d %5d %5d\n",
inet_ntoa(dst_addr), ntohs(dst_port),
so->so_rcv.sb_cc, so->so_snd.sb_cc);
}
for (so = slirp->icmp.so_next; so != &slirp->icmp; so = so->so_next) {
snprintf(buf, sizeof(buf), " ICMP[%d sec]",
(so->so_expire - curtime) / 1000);
src.sin_addr = so->so_laddr;
dst_addr = so->so_faddr;
g_string_append_printf(str, "%-19s %3d %15s - ", buf, so->s,
src.sin_addr.s_addr ? inet_ntoa(src.sin_addr) : "*");
g_string_append_printf(str, "%15s - %5d %5d\n", inet_ntoa(dst_addr),
so->so_rcv.sb_cc, so->so_snd.sb_cc);
}
return g_string_free(str, FALSE);
}