1 /* $OpenBSD: sys_socket.c,v 1.39 2018/07/10 08:58:50 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 .fo_read = soo_read, 52 .fo_write = soo_write, 53 .fo_ioctl = soo_ioctl, 54 .fo_poll = soo_poll, 55 .fo_kqfilter = soo_kqfilter, 56 .fo_stat = soo_stat, 57 .fo_close = soo_close 58 }; 59 60 int 61 soo_read(struct file *fp, off_t *poff, struct uio *uio, struct ucred *cred) 62 { 63 64 return (soreceive((struct socket *)fp->f_data, (struct mbuf **)NULL, 65 uio, (struct mbuf **)NULL, (struct mbuf **)NULL, (int *)NULL, 66 (socklen_t)0)); 67 } 68 69 int 70 soo_write(struct file *fp, off_t *poff, struct uio *uio, struct ucred *cred) 71 { 72 73 return (sosend((struct socket *)fp->f_data, (struct mbuf *)NULL, 74 uio, (struct mbuf *)NULL, (struct mbuf *)NULL, 0)); 75 } 76 77 int 78 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p) 79 { 80 struct socket *so = (struct socket *)fp->f_data; 81 int s, error = 0; 82 83 switch (cmd) { 84 85 case FIONBIO: 86 s = solock(so); 87 if (*(int *)data) 88 so->so_state |= SS_NBIO; 89 else 90 so->so_state &= ~SS_NBIO; 91 sounlock(so, s); 92 break; 93 94 case FIOASYNC: 95 s = solock(so); 96 if (*(int *)data) { 97 so->so_state |= SS_ASYNC; 98 so->so_rcv.sb_flags |= SB_ASYNC; 99 so->so_snd.sb_flags |= SB_ASYNC; 100 } else { 101 so->so_state &= ~SS_ASYNC; 102 so->so_rcv.sb_flags &= ~SB_ASYNC; 103 so->so_snd.sb_flags &= ~SB_ASYNC; 104 } 105 sounlock(so, s); 106 break; 107 108 case FIONREAD: 109 *(int *)data = so->so_rcv.sb_datacc; 110 break; 111 112 case TIOCSPGRP: 113 /* FALLTHROUGH */ 114 case SIOCSPGRP: 115 so->so_pgid = *(int *)data; 116 so->so_siguid = p->p_ucred->cr_ruid; 117 so->so_sigeuid = p->p_ucred->cr_uid; 118 break; 119 120 case TIOCGPGRP: 121 *(int *)data = -so->so_pgid; 122 break; 123 124 case SIOCGPGRP: 125 *(int *)data = so->so_pgid; 126 break; 127 128 case SIOCATMARK: 129 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 130 break; 131 132 default: 133 /* 134 * Interface/routing/protocol specific ioctls: 135 * interface and routing ioctls should have a 136 * different entry since a socket's unnecessary 137 */ 138 if (IOCGROUP(cmd) == 'i') { 139 error = ifioctl(so, cmd, data, p); 140 return (error); 141 } 142 if (IOCGROUP(cmd) == 'r') 143 return (EOPNOTSUPP); 144 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 145 (struct mbuf *)cmd, (struct mbuf *)data, NULL, p)); 146 break; 147 } 148 149 return (error); 150 } 151 152 int 153 soo_poll(struct file *fp, int events, struct proc *p) 154 { 155 struct socket *so = fp->f_data; 156 int revents = 0; 157 int s; 158 159 s = solock(so); 160 if (events & (POLLIN | POLLRDNORM)) { 161 if (soreadable(so)) 162 revents |= events & (POLLIN | POLLRDNORM); 163 } 164 /* NOTE: POLLHUP and POLLOUT/POLLWRNORM are mutually exclusive */ 165 if (so->so_state & SS_ISDISCONNECTED) { 166 revents |= POLLHUP; 167 } else if (events & (POLLOUT | POLLWRNORM)) { 168 if (sowriteable(so)) 169 revents |= events & (POLLOUT | POLLWRNORM); 170 } 171 if (events & (POLLPRI | POLLRDBAND)) { 172 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 173 revents |= events & (POLLPRI | POLLRDBAND); 174 } 175 if (revents == 0) { 176 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 177 selrecord(p, &so->so_rcv.sb_sel); 178 so->so_rcv.sb_flags |= SB_SEL; 179 } 180 if (events & (POLLOUT | POLLWRNORM)) { 181 selrecord(p, &so->so_snd.sb_sel); 182 so->so_snd.sb_flags |= SB_SEL; 183 } 184 } 185 sounlock(so, s); 186 return (revents); 187 } 188 189 int 190 soo_stat(struct file *fp, struct stat *ub, struct proc *p) 191 { 192 struct socket *so = fp->f_data; 193 int s; 194 195 memset(ub, 0, sizeof (*ub)); 196 ub->st_mode = S_IFSOCK; 197 s = solock(so); 198 if ((so->so_state & SS_CANTRCVMORE) == 0 || so->so_rcv.sb_cc != 0) 199 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 200 if ((so->so_state & SS_CANTSENDMORE) == 0) 201 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 202 ub->st_uid = so->so_euid; 203 ub->st_gid = so->so_egid; 204 (void) ((*so->so_proto->pr_usrreq)(so, PRU_SENSE, 205 (struct mbuf *)ub, NULL, NULL, p)); 206 sounlock(so, s); 207 return (0); 208 } 209 210 int 211 soo_close(struct file *fp, struct proc *p) 212 { 213 int error = 0; 214 215 if (fp->f_data) 216 error = soclose(fp->f_data); 217 fp->f_data = 0; 218 return (error); 219 } 220