307 lines
6.1 KiB
C
307 lines
6.1 KiB
C
#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <net/gen/in.h>
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#include <net/gen/tcp.h>
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#include <net/gen/tcp_io.h>
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#include <net/gen/udp.h>
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#include <net/gen/udp_io.h>
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#include <minix/const.h>
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#define DEBUG 0
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static int _tcp_connect(int socket, const struct sockaddr *address,
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socklen_t address_len, nwio_tcpconf_t *tcpconfp);
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static int _udp_connect(int socket, const struct sockaddr *address,
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socklen_t address_len, nwio_udpopt_t *udpoptp);
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static int _uds_connect(int socket, const struct sockaddr *address,
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socklen_t address_len);
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int connect(int socket, const struct sockaddr *address,
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socklen_t address_len)
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{
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int r;
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nwio_tcpconf_t tcpconf;
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nwio_udpopt_t udpopt;
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r= ioctl(socket, NWIOGTCPCONF, &tcpconf);
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if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
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{
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if (r == -1)
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{
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/* Bad file descriptor */
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return -1;
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}
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return _tcp_connect(socket, address, address_len, &tcpconf);
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}
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r= ioctl(socket, NWIOGUDPOPT, &udpopt);
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if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
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{
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if (r == -1)
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{
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/* Bad file descriptor */
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return -1;
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}
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return _udp_connect(socket, address, address_len, &udpopt);
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}
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r= _uds_connect(socket, address, address_len);
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if (r != -1 ||
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(errno != ENOTTY && errno != EBADIOCTL &&
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errno != EAFNOSUPPORT))
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{
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if (r == -1)
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{
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/* Bad file descriptor */
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return -1;
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}
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return r;
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}
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#if DEBUG
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fprintf(stderr, "connect: not implemented for fd %d\n", socket);
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#endif
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errno= ENOSYS;
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return -1;
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}
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static int _tcp_connect(int socket, const struct sockaddr *address,
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socklen_t address_len, nwio_tcpconf_t *tcpconfp)
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{
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int r;
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struct sockaddr_in *sinp;
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nwio_tcpconf_t tcpconf;
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nwio_tcpcl_t tcpcl;
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if (address_len != sizeof(*sinp))
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{
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errno= EINVAL;
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return -1;
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}
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sinp= (struct sockaddr_in *)address;
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if (sinp->sin_family != AF_INET)
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{
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errno= EINVAL;
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return -1;
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}
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tcpconf.nwtc_flags= NWTC_SET_RA | NWTC_SET_RP;
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if ((tcpconfp->nwtc_flags & NWTC_LOCPORT_MASK) == NWTC_LP_UNSET)
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tcpconf.nwtc_flags |= NWTC_LP_SEL;
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tcpconf.nwtc_remaddr= sinp->sin_addr.s_addr;
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tcpconf.nwtc_remport= sinp->sin_port;
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if (ioctl(socket, NWIOSTCPCONF, &tcpconf) == -1)
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{
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/* Ignore EISCONN error. The NWIOTCPCONN ioctl will get the
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* right error.
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*/
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if (errno != EISCONN)
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return -1;
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}
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tcpcl.nwtcl_flags= TCF_DEFAULT;
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r= fcntl(socket, F_GETFL);
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if (r == 1)
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return -1;
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if (r & O_NONBLOCK)
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tcpcl.nwtcl_flags |= TCF_ASYNCH;
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r= ioctl(socket, NWIOTCPCONN, &tcpcl);
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return r;
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}
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static int _udp_connect(int socket, const struct sockaddr *address,
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socklen_t address_len, nwio_udpopt_t *udpoptp)
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{
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int r;
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struct sockaddr_in *sinp;
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nwio_udpopt_t udpopt;
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if (address == NULL)
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{
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/* Unset remote address */
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udpopt.nwuo_flags= NWUO_RP_ANY | NWUO_RA_ANY | NWUO_RWDATALL;
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r= ioctl(socket, NWIOSUDPOPT, &udpopt);
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return r;
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}
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if (address_len != sizeof(*sinp))
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{
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errno= EINVAL;
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return -1;
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}
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sinp= (struct sockaddr_in *)address;
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if (sinp->sin_family != AF_INET)
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{
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errno= EINVAL;
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return -1;
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}
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udpopt.nwuo_flags= NWUO_RP_SET | NWUO_RA_SET | NWUO_RWDATONLY;
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if ((udpoptp->nwuo_flags & NWUO_LOCPORT_MASK) == NWUO_LP_ANY)
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udpopt.nwuo_flags |= NWUO_LP_SEL;
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udpopt.nwuo_remaddr= sinp->sin_addr.s_addr;
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udpopt.nwuo_remport= sinp->sin_port;
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r= ioctl(socket, NWIOSUDPOPT, &udpopt);
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return r;
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}
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static int in_group(uid_t uid, gid_t gid)
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{
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int r, i;
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int size;
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gid_t *list;
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size = sysconf(_SC_NGROUPS_MAX);
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list = malloc(size * sizeof(gid_t));
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if (list == NULL) {
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return 0;
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}
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r= getgroups(size, list);
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if (r == -1) {
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free(list);
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return 0;
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}
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for (i = 0; i < r; i++) {
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if (gid == list[i]) {
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free(list);
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return 1;
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}
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}
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free(list);
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return 0;
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}
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static int _uds_connect(int socket, const struct sockaddr *address,
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socklen_t address_len)
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{
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mode_t bits, perm_bits, access_desired;
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struct stat buf;
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uid_t euid;
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gid_t egid;
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char real_sun_path[PATH_MAX+1];
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char *realpath_result;
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int i, r, shift;
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int null_found;
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if (address == NULL) {
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errno = EFAULT;
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return -1;
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}
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/* sun_family is always supposed to be AF_UNIX */
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if (((struct sockaddr_un *) address)->sun_family != AF_UNIX) {
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errno = EAFNOSUPPORT;
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return -1;
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}
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/* an empty path is not supported */
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if (((struct sockaddr_un *) address)->sun_path[0] == '\0') {
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errno = EINVAL;
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return -1;
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}
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/* the path must be a null terminated string for realpath to work */
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for (null_found = i = 0;
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i < sizeof(((struct sockaddr_un *) address)->sun_path); i++) {
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if (((struct sockaddr_un *) address)->sun_path[i] == '\0') {
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null_found = 1;
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break;
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}
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}
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if (!null_found) {
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errno = EINVAL;
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return -1;
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}
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/*
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* Get the realpath(3) of the socket file.
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*/
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realpath_result = realpath(((struct sockaddr_un *) address)->sun_path,
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real_sun_path);
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if (realpath_result == NULL) {
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return -1;
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}
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if (strlen(real_sun_path) >= UNIX_PATH_MAX) {
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errno = ENAMETOOLONG;
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return -1;
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}
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strcpy(((struct sockaddr_un *) address)->sun_path, real_sun_path);
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/*
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* input parameters look good -- check the permissions of the
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* socket file. emulate eaccess() (i.e. the access(2) function
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* with effective UID/GID).
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*/
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access_desired = R_BIT | W_BIT; /* read + write access */
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euid = geteuid();
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egid = getegid();
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if (euid == -1 || egid == -1) {
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errno = EACCES;
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return -1;
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}
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r= stat(((struct sockaddr_un *) address)->sun_path, &buf);
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if (r == -1) {
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return -1;
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}
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if (!S_ISSOCK(buf.st_mode)) {
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errno = EINVAL;
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return -1;
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}
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bits = buf.st_mode;
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if (euid == ((uid_t) 0)) {
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perm_bits = R_BIT | W_BIT;
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} else {
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if (euid == buf.st_uid) {
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shift = 6; /* owner */
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} else if (egid == buf.st_gid) {
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shift = 3; /* group */
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} else if (in_group(euid, buf.st_gid)) {
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shift = 3; /* suppl. groups */
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} else {
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shift = 0; /* other */
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}
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perm_bits = (bits >> shift) & (R_BIT | W_BIT | X_BIT);
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}
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if ((perm_bits | access_desired) != perm_bits) {
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errno = EACCES;
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return -1;
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}
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/* perform the connect */
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r= ioctl(socket, NWIOSUDSCONN, (void *) address);
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return r;
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}
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