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/* SPDX-License-Identifier: BSD-3-Clause */
* Copyright (c) 1995 Danny Gasparovski.
#include <string.h>
#ifndef _WIN32
#include <sys/un.h>
#include "misc.h"
#include "sbuf.h"
#define SO_EXPIRE 240000
#define SO_EXPIREFAST 10000
/* Helps unify some in/in6 routines. */
union in4or6_addr {
struct in_addr addr4;
struct in6_addr addr6;
typedef union in4or6_addr in4or6_addr;
* Our socket structure
union slirp_sockaddr {
struct sockaddr sa;
struct sockaddr_storage ss;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
struct socket {
struct socket *so_next, *so_prev; /* For a linked list of sockets */
int s; /* The actual socket or file descriptor of ping_pipe below */
#ifndef WIN32
FILE *ping_pipe; /* the popen() stream for ping binary */
int s_aux; /* An auxiliary socket for miscellaneous use. Currently used to
* reserve OS ports in UNIX-to-inet translation. */
struct gfwd_list *guestfwd;
int pollfds_idx; /* GPollFD GArray index */
Slirp *slirp; /* managing slirp instance */
/* XXX union these with not-yet-used sbuf params */
struct mbuf *so_m; /* Pointer to the original SYN packet,
* for non-blocking connect()'s, and
* PING reply's */
struct tcpiphdr *so_ti; /* Pointer to the original ti within
* so_mconn, for non-blocking connections */
uint32_t so_urgc;
union slirp_sockaddr fhost; /* Foreign host */
#define so_faddr fhost.sin.sin_addr
#define so_fport fhost.sin.sin_port
#define so_faddr6 fhost.sin6.sin6_addr
#define so_fport6 fhost.sin6.sin6_port
#define so_ffamily
union slirp_sockaddr lhost; /* Local host */
#define so_laddr lhost.sin.sin_addr
#define so_lport lhost.sin.sin_port
#define so_laddr6 lhost.sin6.sin6_addr
#define so_lport6 lhost.sin6.sin6_port
#define so_lfamily
uint8_t so_iptos; /* Type of service */
uint8_t so_emu; /* Is the socket emulated? */
uint8_t so_type; /* Protocol of the socket. May be 0 if loading old
* states. */
int32_t so_state; /* internal state flags SS_*, below */
struct tcpcb *so_tcpcb; /* pointer to TCP protocol control block */
unsigned so_expire; /* When the socket will expire */
int so_queued; /* Number of packets queued from this socket */
int so_nqueued; /* Number of packets queued in a row
* Used to determine when to "downgrade" a session
* from fastq to batchq */
struct sbuf so_rcv; /* Receive buffer */
struct sbuf so_snd; /* Send buffer */
* Socket state bits. (peer means the host on the Internet,
* local host means the host on the other end of the modem)
#define SS_NOFDREF 0x001 /* No fd reference */
0x002 /* Socket is connecting to peer (non-blocking connect()'s) */
#define SS_ISFCONNECTED 0x004 /* Socket is connected to peer */
0x008 /* Socket can't receive more from peer (for half-closes) */
0x010 /* Socket can't send more to peer (for half-closes) */
#define SS_FWDRAIN \
0x040 /* We received a FIN, drain data and set SS_FCANTSENDMORE */
#define SS_CTL 0x080
0x100 /* Socket is accepting connections from a host on the internet */
0x200 /* If set, the SS_FACCEPTCONN socket will die after one accept */
#define SS_PERSISTENT_MASK 0xf000 /* Unremovable state bits */
#define SS_HOSTFWD 0x1000 /* Socket describes host->guest forwarding */
#define SS_INCOMING \
0x2000 /* Connection was initiated by a host on the internet */
#define SS_HOSTFWD_V6ONLY 0x4000 /* Only bind on v6 addresses */
static inline int sockaddr_equal(const struct sockaddr_storage *a,
const struct sockaddr_storage *b)
if (a->ss_family != b->ss_family) {
return 0;
switch (a->ss_family) {
case AF_INET: {
const struct sockaddr_in *a4 = (const struct sockaddr_in *)a;
const struct sockaddr_in *b4 = (const struct sockaddr_in *)b;
return a4->sin_addr.s_addr == b4->sin_addr.s_addr &&
a4->sin_port == b4->sin_port;
case AF_INET6: {
const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *)a;
const struct sockaddr_in6 *b6 = (const struct sockaddr_in6 *)b;
return (in6_equal(&a6->sin6_addr, &b6->sin6_addr) &&
a6->sin6_port == b6->sin6_port);
#ifndef _WIN32
case AF_UNIX: {
const struct sockaddr_un *aun = (const struct sockaddr_un *)a;
const struct sockaddr_un *bun = (const struct sockaddr_un *)b;
return strncmp(aun->sun_path, bun->sun_path, sizeof(aun->sun_path)) == 0;
return 0;
static inline socklen_t sockaddr_size(const struct sockaddr_storage *a)
switch (a->ss_family) {
case AF_INET:
return sizeof(struct sockaddr_in);
case AF_INET6:
return sizeof(struct sockaddr_in6);
#ifndef _WIN32
case AF_UNIX:
return sizeof(struct sockaddr_un);
static inline void sockaddr_copy(struct sockaddr *dst, socklen_t dstlen, const struct sockaddr *src, socklen_t srclen)
socklen_t len = sockaddr_size((const struct sockaddr_storage *) src);
g_assert(len <= srclen);
g_assert(len <= dstlen);
memcpy(dst, src, len);
struct socket *solookup(struct socket **, struct socket *,
struct sockaddr_storage *, struct sockaddr_storage *);
struct socket *socreate(Slirp *, int);
void sofree(struct socket *);
int soread(struct socket *);
int sorecvoob(struct socket *);
int sosendoob(struct socket *);
int sowrite(struct socket *);
void sorecvfrom(struct socket *);
int sosendto(struct socket *, struct mbuf *);
struct socket *tcp_listen(Slirp *, uint32_t, unsigned, uint32_t, unsigned, int);
struct socket *tcpx_listen(Slirp *slirp,
const struct sockaddr *haddr, socklen_t haddrlen,
const struct sockaddr *laddr, socklen_t laddrlen,
int flags);
void soisfconnecting(register struct socket *);
void soisfconnected(register struct socket *);
void sofwdrain(struct socket *);
struct iovec; /* For win32 */
size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np);
int soreadbuf(struct socket *so, const char *buf, int size);
int sotranslate_out(struct socket *, struct sockaddr_storage *);
void sotranslate_in(struct socket *, struct sockaddr_storage *);
void sotranslate_accept(struct socket *);
void sodrop(struct socket *, int num);
int soassign_guest_addr_if_needed(struct socket *so);
#endif /* SLIRP_SOCKET_H */