1 /* $OpenBSD: sys_socket.c,v 1.33 2017/08/11 21:24:19 mpi Exp $ */ 2 /* $NetBSD: sys_socket.c,v 1.13 1995/08/12 23:59:09 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/file.h> 38 #include <sys/proc.h> 39 #include <sys/mbuf.h> 40 #include <sys/protosw.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 #include <sys/ioctl.h> 44 #include <sys/poll.h> 45 #include <sys/stat.h> 46 47 #include <net/if.h> 48 #include <net/route.h> 49 50 struct fileops socketops = { 51 soo_read, soo_write, soo_ioctl, soo_poll, soo_kqfilter, 52 soo_stat, soo_close 53 }; 54 55 int 56 soo_read(struct file *fp, off_t *poff, struct uio *uio, struct ucred *cred) 57 { 58 59 return (soreceive((struct socket *)fp->f_data, (struct mbuf **)NULL, 60 uio, (struct mbuf **)NULL, (struct mbuf **)NULL, (int *)NULL, 61 (socklen_t)0)); 62 } 63 64 int 65 soo_write(struct file *fp, off_t *poff, struct uio *uio, struct ucred *cred) 66 { 67 68 return (sosend((struct socket *)fp->f_data, (struct mbuf *)NULL, 69 uio, (struct mbuf *)NULL, (struct mbuf *)NULL, 0)); 70 } 71 72 int 73 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p) 74 { 75 struct socket *so = (struct socket *)fp->f_data; 76 int s, error = 0; 77 78 switch (cmd) { 79 80 case FIONBIO: 81 s = solock(so); 82 if (*(int *)data) 83 so->so_state |= SS_NBIO; 84 else 85 so->so_state &= ~SS_NBIO; 86 sounlock(s); 87 break; 88 89 case FIOASYNC: 90 s = solock(so); 91 if (*(int *)data) { 92 so->so_state |= SS_ASYNC; 93 so->so_rcv.sb_flags |= SB_ASYNC; 94 so->so_snd.sb_flags |= SB_ASYNC; 95 } else { 96 so->so_state &= ~SS_ASYNC; 97 so->so_rcv.sb_flags &= ~SB_ASYNC; 98 so->so_snd.sb_flags &= ~SB_ASYNC; 99 } 100 sounlock(s); 101 break; 102 103 case FIONREAD: 104 *(int *)data = so->so_rcv.sb_datacc; 105 break; 106 107 case SIOCSPGRP: 108 so->so_pgid = *(int *)data; 109 so->so_siguid = p->p_ucred->cr_ruid; 110 so->so_sigeuid = p->p_ucred->cr_uid; 111 break; 112 113 case SIOCGPGRP: 114 *(int *)data = so->so_pgid; 115 break; 116 117 case SIOCATMARK: 118 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 119 break; 120 121 default: 122 /* 123 * Interface/routing/protocol specific ioctls: 124 * interface and routing ioctls should have a 125 * different entry since a socket's unnecessary 126 */ 127 if (IOCGROUP(cmd) == 'i') { 128 NET_LOCK(); 129 error = ifioctl(so, cmd, data, p); 130 NET_UNLOCK(); 131 return (error); 132 } 133 if (IOCGROUP(cmd) == 'r') 134 return (EOPNOTSUPP); 135 s = solock(so); 136 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 137 (struct mbuf *)cmd, (struct mbuf *)data, NULL, p)); 138 sounlock(s); 139 break; 140 } 141 142 return (error); 143 } 144 145 int 146 soo_poll(struct file *fp, int events, struct proc *p) 147 { 148 struct socket *so = fp->f_data; 149 int revents = 0; 150 int s; 151 152 s = solock(so); 153 if (events & (POLLIN | POLLRDNORM)) { 154 if (soreadable(so)) 155 revents |= events & (POLLIN | POLLRDNORM); 156 } 157 /* NOTE: POLLHUP and POLLOUT/POLLWRNORM are mutually exclusive */ 158 if (so->so_state & SS_ISDISCONNECTED) { 159 revents |= POLLHUP; 160 } else if (events & (POLLOUT | POLLWRNORM)) { 161 if (sowriteable(so)) 162 revents |= events & (POLLOUT | POLLWRNORM); 163 } 164 if (events & (POLLPRI | POLLRDBAND)) { 165 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 166 revents |= events & (POLLPRI | POLLRDBAND); 167 } 168 if (revents == 0) { 169 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 170 selrecord(p, &so->so_rcv.sb_sel); 171 so->so_rcv.sb_flagsintr |= SB_SEL; 172 } 173 if (events & (POLLOUT | POLLWRNORM)) { 174 selrecord(p, &so->so_snd.sb_sel); 175 so->so_snd.sb_flagsintr |= SB_SEL; 176 } 177 } 178 sounlock(s); 179 return (revents); 180 } 181 182 int 183 soo_stat(struct file *fp, struct stat *ub, struct proc *p) 184 { 185 struct socket *so = fp->f_data; 186 int s; 187 188 memset(ub, 0, sizeof (*ub)); 189 ub->st_mode = S_IFSOCK; 190 s = solock(so); 191 if ((so->so_state & SS_CANTRCVMORE) == 0 || so->so_rcv.sb_cc != 0) 192 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 193 if ((so->so_state & SS_CANTSENDMORE) == 0) 194 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 195 ub->st_uid = so->so_euid; 196 ub->st_gid = so->so_egid; 197 (void) ((*so->so_proto->pr_usrreq)(so, PRU_SENSE, 198 (struct mbuf *)ub, NULL, NULL, p)); 199 sounlock(s); 200 return (0); 201 } 202 203 int 204 soo_close(struct file *fp, struct proc *p) 205 { 206 int error = 0; 207 208 if (fp->f_data) 209 error = soclose(fp->f_data); 210 fp->f_data = 0; 211 return (error); 212 } 213