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#include "../config.h"
/*! \addtogroup socket
* @{
*/
/*! \file socket.c
* \brief Osmocom socket convenience functions
*/
#ifdef HAVE_SYS_SOCKET_H
#include <osmocom/core/logging.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>
#include <ifaddrs.h>
/*! \brief Initialize a socket (including bind/connect)
* \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
* \param[in] host remote host name or IP address in string form
* \param[in] port remote port number in host byte order
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
*
* This function creates a new socket of the designated \a family, \a
* type and \a proto and optionally binds or connects it, depending on
* the value of \a flags parameter.
*/
int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto,
const char *host, uint16_t port, unsigned int flags)
{
struct addrinfo hints, *result, *rp;
int sfd, rc, on = 1;
char portbuf[16];
if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) ==
(OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT))
return -EINVAL;
sprintf(portbuf, "%u", port);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = family;
hints.ai_socktype = type;
hints.ai_flags = 0;
hints.ai_protocol = proto;
if (flags & OSMO_SOCK_F_BIND)
hints.ai_flags |= AI_PASSIVE;
rc = getaddrinfo(host, portbuf, &hints, &result);
if (rc != 0) {
perror("getaddrinfo returned NULL");
return -EINVAL;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sfd == -1)
continue;
if (flags & OSMO_SOCK_F_NONBLOCK) {
if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) {
perror("cannot set this socket unblocking");
close(sfd);
return -EINVAL;
}
}
if (flags & OSMO_SOCK_F_CONNECT) {
rc = connect(sfd, rp->ai_addr, rp->ai_addrlen);
if (rc != -1 || (rc == -1 && errno == EINPROGRESS))
break;
} else {
rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR,
&on, sizeof(on));
if (rc < 0) {
perror("cannot setsockopt socket");
break;
}
if (bind(sfd, rp->ai_addr, rp->ai_addrlen) != -1)
break;
}
close(sfd);
}
freeaddrinfo(result);
if (rp == NULL) {
perror("unable to connect/bind socket");
return -ENODEV;
}
setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
/* Make sure to call 'listen' on a bound, connection-oriented sock */
if (flags & OSMO_SOCK_F_BIND) {
switch (type) {
case SOCK_STREAM:
case SOCK_SEQPACKET:
listen(sfd, 10);
break;
}
}
return sfd;
}
/*! \brief Initialize a socket and fill \ref osmo_fd
* \param[out] osmocom file descriptor (will be filled in)
* \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
* \param[in] host remote host name or IP address in string form
* \param[in] port remote port number in host byte order
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
*
* This function creates (and optionall binds/connects) a socket using
* \ref osmo_sock_init, but also fills the \a ofd structure.
*/
int osmo_sock_init_ofd(struct osmo_fd *ofd, int family, int type, int proto,
const char *host, uint16_t port, unsigned int flags)
{
int sfd, rc;
sfd = osmo_sock_init(family, type, proto, host, port, flags);
if (sfd < 0)
return sfd;
ofd->fd = sfd;
ofd->when = BSC_FD_READ;
rc = osmo_fd_register(ofd);
if (rc < 0) {
close(sfd);
return rc;
}
return sfd;
}
/*! \brief Initialize a socket and fill \ref sockaddr
* \param[out] ss socket address (will be filled in)
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
*
* This function creates (and optionall binds/connects) a socket using
* \ref osmo_sock_init, but also fills the \a ss structure.
*/
int osmo_sock_init_sa(struct sockaddr *ss, uint16_t type,
uint8_t proto, unsigned int flags)
{
char host[NI_MAXHOST];
uint16_t port;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
int s, sa_len;
/* determine port and host from ss */
switch (ss->sa_family) {
case AF_INET:
sin = (struct sockaddr_in *) ss;
sa_len = sizeof(struct sockaddr_in);
port = ntohs(sin->sin_port);
break;
case AF_INET6:
sin6 = (struct sockaddr_in6 *) ss;
sa_len = sizeof(struct sockaddr_in6);
port = ntohs(sin6->sin6_port);
break;
default:
return -EINVAL;
}
s = getnameinfo(ss, sa_len, host, NI_MAXHOST,
NULL, 0, NI_NUMERICHOST);
if (s != 0) {
perror("getnameinfo failed");
return s;
}
return osmo_sock_init(ss->sa_family, type, proto, host, port, flags);
}
static int sockaddr_equal(const struct sockaddr *a,
const struct sockaddr *b, unsigned int len)
{
struct sockaddr_in *sin_a, *sin_b;
struct sockaddr_in6 *sin6_a, *sin6_b;
if (a->sa_family != b->sa_family)
return 0;
switch (a->sa_family) {
case AF_INET:
sin_a = (struct sockaddr_in *)a;
sin_b = (struct sockaddr_in *)b;
if (!memcmp(&sin_a->sin_addr, &sin_b->sin_addr,
sizeof(struct in_addr)))
return 1;
break;
case AF_INET6:
sin6_a = (struct sockaddr_in6 *)a;
sin6_b = (struct sockaddr_in6 *)b;
if (!memcmp(&sin6_a->sin6_addr, &sin6_b->sin6_addr,
sizeof(struct in6_addr)))
return 1;
break;
}
return 0;
}
/*! \brief Determine if the given address is a local address
* \param[in] addr Socket Address
* \param[in] addrlen Length of socket address in bytes
* \returns 1 if address is local, 0 otherwise.
*/
int osmo_sockaddr_is_local(struct sockaddr *addr, socklen_t addrlen)
{
struct ifaddrs *ifaddr, *ifa;
if (getifaddrs(&ifaddr) == -1) {
perror("getifaddrs");
return -EIO;
}
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr)
continue;
if (sockaddr_equal(ifa->ifa_addr, addr, addrlen))
return 1;
}
return 0;
}
#endif /* HAVE_SYS_SOCKET_H */
/*! }@ */
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