1 /* $OpenBSD: sys_socket.c,v 1.31 2017/07/20 08:25:17 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 if (*(int *)data) 82 so->so_state |= SS_NBIO; 83 else 84 so->so_state &= ~SS_NBIO; 85 return (0); 86 87 case FIOASYNC: 88 if (*(int *)data) { 89 so->so_state |= SS_ASYNC; 90 so->so_rcv.sb_flags |= SB_ASYNC; 91 so->so_snd.sb_flags |= SB_ASYNC; 92 } else { 93 so->so_state &= ~SS_ASYNC; 94 so->so_rcv.sb_flags &= ~SB_ASYNC; 95 so->so_snd.sb_flags &= ~SB_ASYNC; 96 } 97 return (0); 98 99 case FIONREAD: 100 *(int *)data = so->so_rcv.sb_datacc; 101 return (0); 102 103 case SIOCSPGRP: 104 so->so_pgid = *(int *)data; 105 so->so_siguid = p->p_ucred->cr_ruid; 106 so->so_sigeuid = p->p_ucred->cr_uid; 107 return (0); 108 109 case SIOCGPGRP: 110 *(int *)data = so->so_pgid; 111 return (0); 112 113 case SIOCATMARK: 114 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 115 return (0); 116 } 117 /* 118 * Interface/routing/protocol specific ioctls: 119 * interface and routing ioctls should have a 120 * different entry since a socket's unnecessary 121 */ 122 if (IOCGROUP(cmd) == 'i') { 123 NET_LOCK(s); 124 error = ifioctl(so, cmd, data, p); 125 NET_UNLOCK(s); 126 return (error); 127 } 128 if (IOCGROUP(cmd) == 'r') 129 return (EOPNOTSUPP); 130 s = solock(so); 131 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 132 (struct mbuf *)cmd, (struct mbuf *)data, (struct mbuf *)NULL, p)); 133 sounlock(s); 134 135 return (error); 136 } 137 138 int 139 soo_poll(struct file *fp, int events, struct proc *p) 140 { 141 struct socket *so = fp->f_data; 142 int revents = 0; 143 int s; 144 145 s = solock(so); 146 if (events & (POLLIN | POLLRDNORM)) { 147 if (soreadable(so)) 148 revents |= events & (POLLIN | POLLRDNORM); 149 } 150 /* NOTE: POLLHUP and POLLOUT/POLLWRNORM are mutually exclusive */ 151 if (so->so_state & SS_ISDISCONNECTED) { 152 revents |= POLLHUP; 153 } else if (events & (POLLOUT | POLLWRNORM)) { 154 if (sowriteable(so)) 155 revents |= events & (POLLOUT | POLLWRNORM); 156 } 157 if (events & (POLLPRI | POLLRDBAND)) { 158 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 159 revents |= events & (POLLPRI | POLLRDBAND); 160 } 161 if (revents == 0) { 162 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 163 selrecord(p, &so->so_rcv.sb_sel); 164 so->so_rcv.sb_flagsintr |= SB_SEL; 165 } 166 if (events & (POLLOUT | POLLWRNORM)) { 167 selrecord(p, &so->so_snd.sb_sel); 168 so->so_snd.sb_flagsintr |= SB_SEL; 169 } 170 } 171 sounlock(s); 172 return (revents); 173 } 174 175 int 176 soo_stat(struct file *fp, struct stat *ub, struct proc *p) 177 { 178 struct socket *so = fp->f_data; 179 int s; 180 181 memset(ub, 0, sizeof (*ub)); 182 ub->st_mode = S_IFSOCK; 183 s = solock(so); 184 if ((so->so_state & SS_CANTRCVMORE) == 0 || so->so_rcv.sb_cc != 0) 185 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 186 if ((so->so_state & SS_CANTSENDMORE) == 0) 187 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 188 ub->st_uid = so->so_euid; 189 ub->st_gid = so->so_egid; 190 (void) ((*so->so_proto->pr_usrreq)(so, PRU_SENSE, 191 (struct mbuf *)ub, NULL, NULL, p)); 192 sounlock(s); 193 return (0); 194 } 195 196 int 197 soo_close(struct file *fp, struct proc *p) 198 { 199 int error = 0; 200 201 if (fp->f_data) 202 error = soclose(fp->f_data); 203 fp->f_data = 0; 204 return (error); 205 } 206