minix/lib/libc/ip/bind.c

#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>

#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/gen/udp.h>
#include <net/gen/udp_io.h>
#include <sys/un.h>

#include <minix/config.h>
#include <minix/const.h>

#define DEBUG 0

static int _tcp_bind(int socket, const struct sockaddr *address,
	socklen_t address_len, nwio_tcpconf_t *tcpconfp);
static int _udp_bind(int socket, const struct sockaddr *address,
	socklen_t address_len, nwio_udpopt_t *udpoptp);
static int _uds_bind(int socket, const struct sockaddr *address,
	socklen_t address_len, struct sockaddr_un *uds_addr);

int bind(int socket, const struct sockaddr *address, socklen_t address_len)
{
	int r;
	nwio_tcpconf_t tcpconf;
	nwio_udpopt_t udpopt;
	struct sockaddr_un uds_addr;

	r= ioctl(socket, NWIOGTCPCONF, &tcpconf);
	if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
	{
		if (r == -1)
			return r;
		r= _tcp_bind(socket, address, address_len, &tcpconf);
#if DEBUG
		if (r == -1)
		{
			int t_errno= errno;
			fprintf(stderr, "bind(tcp) failed: %s\n",
				strerror(errno));
			errno= t_errno;
		}
#endif
		return r;
	}

	r= ioctl(socket, NWIOGUDPOPT, &udpopt);
	if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
	{
		if (r == -1)
			return r;
		return _udp_bind(socket, address, address_len, &udpopt);
	}

	r= ioctl(socket, NWIOGUDSADDR, &uds_addr);
	if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
	{
		if (r == -1)
			return r;
		return _uds_bind(socket, address, address_len, &uds_addr);
	}

#if DEBUG
	fprintf(stderr, "bind: not implemented for fd %d\n", socket);
#endif
	errno= ENOSYS;
	return -1;
}

static int _tcp_bind(int socket, const struct sockaddr *address,
	socklen_t address_len, nwio_tcpconf_t *tcpconfp)
{
	int r;
	nwio_tcpconf_t tcpconf;
	struct sockaddr_in *sinp;

	sinp= (struct sockaddr_in *)address;
	if (sinp->sin_family != AF_INET || address_len != sizeof(*sinp))
	{
#if DEBUG
		fprintf(stderr, "bind(tcp): sin_family = %d, len = %d\n",
			sinp->sin_family, address_len);
#endif
		errno= EAFNOSUPPORT;
		return -1;
	}

	if (sinp->sin_addr.s_addr != INADDR_ANY &&
		sinp->sin_addr.s_addr != tcpconfp->nwtc_locaddr)
	{
		errno= EADDRNOTAVAIL;
		return -1;
	}

	tcpconf.nwtc_flags= 0;

	if (sinp->sin_port == 0)
		tcpconf.nwtc_flags |= NWTC_LP_SEL;
	else
	{
		tcpconf.nwtc_flags |= NWTC_LP_SET;
		tcpconf.nwtc_locport= sinp->sin_port;
	}

	r= ioctl(socket, NWIOSTCPCONF, &tcpconf);
	return r;
}

static int _udp_bind(int socket, const struct sockaddr *address,
	socklen_t address_len, nwio_udpopt_t *udpoptp)
{
	int r;
	unsigned long curr_flags;
	nwio_udpopt_t udpopt;
	struct sockaddr_in *sinp;

	sinp= (struct sockaddr_in *)address;
	if (sinp->sin_family != AF_INET || address_len != sizeof(*sinp))
	{
#if DEBUG
		fprintf(stderr, "bind(udp): sin_family = %d, len = %d\n",
			sinp->sin_family, address_len);
#endif
		errno= EAFNOSUPPORT;
		return -1;
	}

	if (sinp->sin_addr.s_addr != INADDR_ANY &&
		sinp->sin_addr.s_addr != udpoptp->nwuo_locaddr)
	{
		errno= EADDRNOTAVAIL;
		return -1;
	}

	udpopt.nwuo_flags= 0;

	if (sinp->sin_port == 0)
		udpopt.nwuo_flags |= NWUO_LP_SEL;
	else
	{
		udpopt.nwuo_flags |= NWUO_LP_SET;
		udpopt.nwuo_locport= sinp->sin_port;
	}

	curr_flags= udpoptp->nwuo_flags;
	if (!(curr_flags & NWUO_ACC_MASK))
		udpopt.nwuo_flags |= NWUO_EXCL;
	if (!(curr_flags & (NWUO_EN_LOC|NWUO_DI_LOC)))
		udpopt.nwuo_flags |= NWUO_EN_LOC;
	if (!(curr_flags & (NWUO_EN_BROAD|NWUO_DI_BROAD)))
		udpopt.nwuo_flags |= NWUO_EN_BROAD;
	if (!(curr_flags & (NWUO_RP_SET|NWUO_RP_ANY)))
		udpopt.nwuo_flags |= NWUO_RP_ANY;
	if (!(curr_flags & (NWUO_RA_SET|NWUO_RA_ANY)))
		udpopt.nwuo_flags |= NWUO_RA_ANY;
	if (!(curr_flags & (NWUO_RWDATONLY|NWUO_RWDATALL)))
		udpopt.nwuo_flags |= NWUO_RWDATALL;
	if (!(curr_flags & (NWUO_EN_IPOPT|NWUO_DI_IPOPT)))
		udpopt.nwuo_flags |= NWUO_DI_IPOPT;

	r= ioctl(socket, NWIOSUDPOPT, &udpopt);
	return r;
}

static int in_group(uid_t uid, gid_t gid)
{
	int r, i;
	int size;
	gid_t *list;

	size = sysconf(_SC_NGROUPS_MAX);
	list = malloc(size * sizeof(gid_t));

	if (list == NULL) {
		return 0;
	}

	r= getgroups(size, list);
	if (r == -1) {
		free(list);
		return 0;
	}

	for (i = 0; i < r; i++) {
		if (gid == list[i]) {
			free(list);
			return 1;
		}
	}

	free(list);
	return 0;
}


static int _uds_bind(int socket, const struct sockaddr *address,
	socklen_t address_len, struct sockaddr_un *uds_addr)
{
	int r;
	int did_mknod;

	if (address == NULL) {
		errno = EFAULT;
		return -1;
	}

	did_mknod = 0;

	r = mknod(((struct sockaddr_un *) address)->sun_path,
		S_IFSOCK|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH, 0);

	if (r == -1 && errno != EEXIST) {
		return -1;
	} else if (r == 0) {
		did_mknod = 1;
	}

	/* perform the bind */
	r= ioctl(socket, NWIOSUDSADDR, (void *) address);

	if (r == -1 && did_mknod) {

		/* bind() failed in pfs, so we roll back the 
		 * file system change
		 */
		unlink(((struct sockaddr_un *) address)->sun_path);
	}

	return r;
}