1 /* $OpenBSD: sys_socket.c,v 1.44 2020/01/08 16:27:41 visa 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 #include <sys/fcntl.h> 47 48 #include <net/if.h> 49 #include <net/route.h> 50 51 const struct fileops socketops = { 52 .fo_read = soo_read, 53 .fo_write = soo_write, 54 .fo_ioctl = soo_ioctl, 55 .fo_poll = soo_poll, 56 .fo_kqfilter = soo_kqfilter, 57 .fo_stat = soo_stat, 58 .fo_close = soo_close 59 }; 60 61 int 62 soo_read(struct file *fp, struct uio *uio, int fflags) 63 { 64 struct socket *so = (struct socket *)fp->f_data; 65 int flags = 0; 66 67 if (fp->f_flag & FNONBLOCK) 68 flags |= MSG_DONTWAIT; 69 70 return (soreceive(so, NULL, uio, NULL, NULL, &flags, 0)); 71 } 72 73 int 74 soo_write(struct file *fp, struct uio *uio, int fflags) 75 { 76 struct socket *so = (struct socket *)fp->f_data; 77 int flags = 0; 78 79 if (fp->f_flag & FNONBLOCK) 80 flags |= MSG_DONTWAIT; 81 82 return (sosend(so, NULL, uio, NULL, NULL, flags)); 83 } 84 85 int 86 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p) 87 { 88 struct socket *so = (struct socket *)fp->f_data; 89 int s, error = 0; 90 91 switch (cmd) { 92 93 case FIONBIO: 94 break; 95 96 case FIOASYNC: 97 s = solock(so); 98 if (*(int *)data) { 99 so->so_state |= SS_ASYNC; 100 so->so_rcv.sb_flags |= SB_ASYNC; 101 so->so_snd.sb_flags |= SB_ASYNC; 102 } else { 103 so->so_state &= ~SS_ASYNC; 104 so->so_rcv.sb_flags &= ~SB_ASYNC; 105 so->so_snd.sb_flags &= ~SB_ASYNC; 106 } 107 sounlock(so, s); 108 break; 109 110 case FIONREAD: 111 *(int *)data = so->so_rcv.sb_datacc; 112 break; 113 114 case FIOSETOWN: 115 case SIOCSPGRP: 116 case TIOCSPGRP: 117 error = sigio_setown(&so->so_sigio, cmd, data); 118 break; 119 120 case FIOGETOWN: 121 case SIOCGPGRP: 122 case TIOCGPGRP: 123 sigio_getown(&so->so_sigio, cmd, data); 124 break; 125 126 case SIOCATMARK: 127 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 128 break; 129 130 default: 131 /* 132 * Interface/routing/protocol specific ioctls: 133 * interface and routing ioctls should have a 134 * different entry since a socket's unnecessary 135 */ 136 if (IOCGROUP(cmd) == 'i') { 137 error = ifioctl(so, cmd, data, p); 138 return (error); 139 } 140 if (IOCGROUP(cmd) == 'r') 141 return (EOPNOTSUPP); 142 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 143 (struct mbuf *)cmd, (struct mbuf *)data, NULL, p)); 144 break; 145 } 146 147 return (error); 148 } 149 150 int 151 soo_poll(struct file *fp, int events, struct proc *p) 152 { 153 struct socket *so = fp->f_data; 154 int revents = 0; 155 int s; 156 157 s = solock(so); 158 if (events & (POLLIN | POLLRDNORM)) { 159 if (soreadable(so)) 160 revents |= events & (POLLIN | POLLRDNORM); 161 } 162 /* NOTE: POLLHUP and POLLOUT/POLLWRNORM are mutually exclusive */ 163 if (so->so_state & SS_ISDISCONNECTED) { 164 revents |= POLLHUP; 165 } else if (events & (POLLOUT | POLLWRNORM)) { 166 if (sowriteable(so)) 167 revents |= events & (POLLOUT | POLLWRNORM); 168 } 169 if (events & (POLLPRI | POLLRDBAND)) { 170 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 171 revents |= events & (POLLPRI | POLLRDBAND); 172 } 173 if (revents == 0) { 174 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 175 selrecord(p, &so->so_rcv.sb_sel); 176 so->so_rcv.sb_flags |= SB_SEL; 177 } 178 if (events & (POLLOUT | POLLWRNORM)) { 179 selrecord(p, &so->so_snd.sb_sel); 180 so->so_snd.sb_flags |= SB_SEL; 181 } 182 } 183 sounlock(so, s); 184 return (revents); 185 } 186 187 int 188 soo_stat(struct file *fp, struct stat *ub, struct proc *p) 189 { 190 struct socket *so = fp->f_data; 191 int s; 192 193 memset(ub, 0, sizeof (*ub)); 194 ub->st_mode = S_IFSOCK; 195 s = solock(so); 196 if ((so->so_state & SS_CANTRCVMORE) == 0 || so->so_rcv.sb_cc != 0) 197 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 198 if ((so->so_state & SS_CANTSENDMORE) == 0) 199 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 200 ub->st_uid = so->so_euid; 201 ub->st_gid = so->so_egid; 202 (void) ((*so->so_proto->pr_usrreq)(so, PRU_SENSE, 203 (struct mbuf *)ub, NULL, NULL, p)); 204 sounlock(so, s); 205 return (0); 206 } 207 208 int 209 soo_close(struct file *fp, struct proc *p) 210 { 211 int flags, error = 0; 212 213 if (fp->f_data) { 214 flags = (fp->f_flag & FNONBLOCK) ? MSG_DONTWAIT : 0; 215 error = soclose(fp->f_data, flags); 216 } 217 fp->f_data = 0; 218 return (error); 219 } 220