| 1 | /* |
| 2 | * Copyright (c) 1992, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * This code is derived from software donated to Berkeley by |
| 7 | * Jan-Simon Pendry. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. All advertising materials mentioning features or use of this software |
| 18 | * must display the following acknowledgement: |
| 19 | * This product includes software developed by the University of |
| 20 | * California, Berkeley and its contributors. |
| 21 | * 4. Neither the name of the University nor the names of its contributors |
| 22 | * may be used to endorse or promote products derived from this software |
| 23 | * without specific prior written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 35 | * SUCH DAMAGE. |
| 36 | * |
| 37 | * @(#)activate.c 8.3 (Berkeley) 4/28/95 |
| 38 | * |
| 39 | * $FreeBSD: src/sbin/mount_portal/activate.c,v 1.7 1999/08/28 00:13:35 peter Exp $ |
| 40 | * $DragonFly: src/sbin/mount_portal/activate.c,v 1.6 2007/05/18 17:05:12 dillon Exp $ |
| 41 | */ |
| 42 | |
| 43 | #include <errno.h> |
| 44 | #include <string.h> |
| 45 | #include <unistd.h> |
| 46 | #include <sys/types.h> |
| 47 | #include <sys/param.h> |
| 48 | #include <sys/socket.h> |
| 49 | #include <sys/syslog.h> |
| 50 | #include <sys/uio.h> |
| 51 | |
| 52 | #include "portald.h" |
| 53 | |
| 54 | /* |
| 55 | * Scan the providers list and call the |
| 56 | * appropriate function. |
| 57 | */ |
| 58 | static int |
| 59 | activate_argv(struct portal_cred *pcr, char *key, char **v, int so, int *fdp) |
| 60 | { |
| 61 | provider *pr; |
| 62 | |
| 63 | for (pr = providers; pr->pr_match; pr++) |
| 64 | if (strcmp(v[0], pr->pr_match) == 0) |
| 65 | return ((*pr->pr_func)(pcr, key, v, so, fdp)); |
| 66 | |
| 67 | return (ENOENT); |
| 68 | } |
| 69 | |
| 70 | static int |
| 71 | get_request(int so, struct portal_cred *pcr, char *key, int klen) |
| 72 | { |
| 73 | struct iovec iov[2]; |
| 74 | struct msghdr msg; |
| 75 | int n; |
| 76 | |
| 77 | iov[0].iov_base = (caddr_t) pcr; |
| 78 | iov[0].iov_len = sizeof(*pcr); |
| 79 | iov[1].iov_base = key; |
| 80 | iov[1].iov_len = klen; |
| 81 | |
| 82 | memset(&msg, 0, sizeof(msg)); |
| 83 | msg.msg_iov = iov; |
| 84 | msg.msg_iovlen = 2; |
| 85 | |
| 86 | n = recvmsg(so, &msg, 0); |
| 87 | if (n < 0) |
| 88 | return (errno); |
| 89 | |
| 90 | if ((size_t)n <= sizeof(*pcr)) |
| 91 | return (EINVAL); |
| 92 | |
| 93 | n -= sizeof(*pcr); |
| 94 | key[n] = '\0'; |
| 95 | |
| 96 | return (0); |
| 97 | } |
| 98 | |
| 99 | static void |
| 100 | send_reply(int so, int fd, int error) |
| 101 | { |
| 102 | int n; |
| 103 | struct iovec iov; |
| 104 | struct msghdr msg; |
| 105 | struct { |
| 106 | struct cmsghdr cmsg; |
| 107 | int fd; |
| 108 | } ctl; |
| 109 | |
| 110 | /* |
| 111 | * Line up error code. Don't worry about byte ordering |
| 112 | * because we must be sending to the local machine. |
| 113 | */ |
| 114 | iov.iov_base = (caddr_t) &error; |
| 115 | iov.iov_len = sizeof(error); |
| 116 | |
| 117 | /* |
| 118 | * Build a msghdr |
| 119 | */ |
| 120 | memset(&msg, 0, sizeof(msg)); |
| 121 | msg.msg_iov = &iov; |
| 122 | msg.msg_iovlen = 1; |
| 123 | |
| 124 | /* |
| 125 | * If there is a file descriptor to send then |
| 126 | * construct a suitable rights control message. |
| 127 | */ |
| 128 | if (fd >= 0) { |
| 129 | ctl.fd = fd; |
| 130 | ctl.cmsg.cmsg_len = sizeof(ctl); |
| 131 | ctl.cmsg.cmsg_level = SOL_SOCKET; |
| 132 | ctl.cmsg.cmsg_type = SCM_RIGHTS; |
| 133 | msg.msg_control = (caddr_t) &ctl; |
| 134 | msg.msg_controllen = ctl.cmsg.cmsg_len; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Send to kernel... |
| 139 | */ |
| 140 | if ((n = sendmsg(so, &msg, 0)) < 0) |
| 141 | syslog(LOG_ERR, "send: %s", strerror(errno)); |
| 142 | #ifdef DEBUG |
| 143 | fprintf(stderr, "sent %d bytes\n", n); |
| 144 | #endif |
| 145 | sleep(1); /*XXX*/ |
| 146 | #ifdef notdef |
| 147 | if (shutdown(so, SHUT_RDWR) < 0) |
| 148 | syslog(LOG_ERR, "shutdown: %s", strerror(errno)); |
| 149 | #endif |
| 150 | /* |
| 151 | * Throw away the open file descriptor |
| 152 | */ |
| 153 | close(fd); |
| 154 | } |
| 155 | |
| 156 | void |
| 157 | activate(qelem *q, int so) |
| 158 | { |
| 159 | struct portal_cred pcred; |
| 160 | char key[MAXPATHLEN+1]; |
| 161 | int error; |
| 162 | char **v; |
| 163 | int fd = -1; |
| 164 | |
| 165 | /* |
| 166 | * Read the key from the socket |
| 167 | */ |
| 168 | error = get_request(so, &pcred, key, sizeof(key)); |
| 169 | if (error) { |
| 170 | syslog(LOG_ERR, "activate: recvmsg: %s", strerror(error)); |
| 171 | goto drop; |
| 172 | } |
| 173 | |
| 174 | #ifdef DEBUG |
| 175 | fprintf(stderr, "lookup key %s\n", key); |
| 176 | #endif |
| 177 | |
| 178 | /* |
| 179 | * Find a match in the configuration file |
| 180 | */ |
| 181 | v = conf_match(q, key); |
| 182 | |
| 183 | /* |
| 184 | * If a match existed, then find an appropriate portal |
| 185 | * otherwise simply return ENOENT. |
| 186 | */ |
| 187 | if (v) { |
| 188 | error = activate_argv(&pcred, key, v, so, &fd); |
| 189 | if (error) |
| 190 | fd = -1; |
| 191 | else if (fd < 0) |
| 192 | error = -1; |
| 193 | } else { |
| 194 | error = ENOENT; |
| 195 | } |
| 196 | |
| 197 | if (error >= 0) |
| 198 | send_reply(so, fd, error); |
| 199 | |
| 200 | drop:; |
| 201 | close(so); |
| 202 | } |