| 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 | * %sccs.include.redist.c% |
| 10 | * |
| 11 | * @(#)activate.c 8.2 (Berkeley) %G% |
| 12 | * |
| 13 | * $Id: activate.c,v 1.2 1992/05/27 07:09:27 jsp Exp jsp $ |
| 14 | */ |
| 15 | |
| 16 | #include <stdio.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <unistd.h> |
| 19 | #include <string.h> |
| 20 | #include <errno.h> |
| 21 | #include <signal.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <sys/param.h> |
| 24 | #include <sys/socket.h> |
| 25 | #include <sys/un.h> |
| 26 | #include <sys/syslog.h> |
| 27 | #include <sys/uio.h> |
| 28 | |
| 29 | #include "portald.h" |
| 30 | |
| 31 | /* |
| 32 | * Scan the providers list and call the |
| 33 | * appropriate function. |
| 34 | */ |
| 35 | static int activate_argv(pcr, key, v, so, fdp) |
| 36 | struct portal_cred *pcr; |
| 37 | char *key; |
| 38 | char **v; |
| 39 | int so; |
| 40 | int *fdp; |
| 41 | { |
| 42 | provider *pr; |
| 43 | |
| 44 | for (pr = providers; pr->pr_match; pr++) |
| 45 | if (strcmp(v[0], pr->pr_match) == 0) |
| 46 | return ((*pr->pr_func)(pcr, key, v, so, fdp)); |
| 47 | |
| 48 | return (ENOENT); |
| 49 | } |
| 50 | |
| 51 | static int get_request(so, pcr, key, klen) |
| 52 | int so; |
| 53 | struct portal_cred *pcr; |
| 54 | char *key; |
| 55 | int klen; |
| 56 | { |
| 57 | struct iovec iov[2]; |
| 58 | struct msghdr msg; |
| 59 | int n; |
| 60 | |
| 61 | iov[0].iov_base = (caddr_t) pcr; |
| 62 | iov[0].iov_len = sizeof(*pcr); |
| 63 | iov[1].iov_base = key; |
| 64 | iov[1].iov_len = klen; |
| 65 | |
| 66 | bzero((char *) &msg, sizeof(msg)); |
| 67 | msg.msg_iov = iov; |
| 68 | msg.msg_iovlen = 2; |
| 69 | |
| 70 | n = recvmsg(so, &msg, 0); |
| 71 | if (n < 0) |
| 72 | return (errno); |
| 73 | |
| 74 | if (n <= sizeof(*pcr)) |
| 75 | return (EINVAL); |
| 76 | |
| 77 | n -= sizeof(*pcr); |
| 78 | key[n] = '\0'; |
| 79 | |
| 80 | return (0); |
| 81 | } |
| 82 | |
| 83 | static void send_reply(so, fd, error) |
| 84 | int so; |
| 85 | int fd; |
| 86 | int error; |
| 87 | { |
| 88 | int n; |
| 89 | struct iovec iov; |
| 90 | struct msghdr msg; |
| 91 | struct { |
| 92 | struct cmsghdr cmsg; |
| 93 | int fd; |
| 94 | } ctl; |
| 95 | |
| 96 | /* |
| 97 | * Line up error code. Don't worry about byte ordering |
| 98 | * because we must be sending to the local machine. |
| 99 | */ |
| 100 | iov.iov_base = (caddr_t) &error; |
| 101 | iov.iov_len = sizeof(error); |
| 102 | |
| 103 | /* |
| 104 | * Build a msghdr |
| 105 | */ |
| 106 | bzero((char *) &msg, sizeof(msg)); |
| 107 | msg.msg_iov = &iov; |
| 108 | msg.msg_iovlen = 1; |
| 109 | |
| 110 | /* |
| 111 | * If there is a file descriptor to send then |
| 112 | * construct a suitable rights control message. |
| 113 | */ |
| 114 | if (fd >= 0) { |
| 115 | ctl.fd = fd; |
| 116 | ctl.cmsg.cmsg_len = sizeof(ctl); |
| 117 | ctl.cmsg.cmsg_level = SOL_SOCKET; |
| 118 | ctl.cmsg.cmsg_type = SCM_RIGHTS; |
| 119 | msg.msg_control = (caddr_t) &ctl; |
| 120 | msg.msg_controllen = ctl.cmsg.cmsg_len; |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Send to kernel... |
| 125 | */ |
| 126 | if ((n = sendmsg(so, &msg, MSG_EOR)) < 0) |
| 127 | syslog(LOG_ERR, "send: %s", strerror(errno)); |
| 128 | #ifdef DEBUG |
| 129 | fprintf(stderr, "sent %d bytes\n", n); |
| 130 | #endif |
| 131 | sleep(1); /*XXX*/ |
| 132 | #ifdef notdef |
| 133 | if (shutdown(so, 2) < 0) |
| 134 | syslog(LOG_ERR, "shutdown: %s", strerror(errno)); |
| 135 | #endif |
| 136 | /* |
| 137 | * Throw away the open file descriptor |
| 138 | */ |
| 139 | (void) close(fd); |
| 140 | } |
| 141 | |
| 142 | void activate(q, so) |
| 143 | qelem *q; |
| 144 | int so; |
| 145 | { |
| 146 | struct portal_cred pcred; |
| 147 | char key[MAXPATHLEN+1]; |
| 148 | int error; |
| 149 | char **v; |
| 150 | int fd = -1; |
| 151 | |
| 152 | /* |
| 153 | * Read the key from the socket |
| 154 | */ |
| 155 | error = get_request(so, &pcred, key, sizeof(key)); |
| 156 | if (error) { |
| 157 | syslog(LOG_ERR, "activate: recvmsg: %s", strerror(error)); |
| 158 | goto drop; |
| 159 | } |
| 160 | |
| 161 | #ifdef DEBUG |
| 162 | fprintf(stderr, "lookup key %s\n", key); |
| 163 | #endif |
| 164 | |
| 165 | /* |
| 166 | * Find a match in the configuration file |
| 167 | */ |
| 168 | v = conf_match(q, key); |
| 169 | |
| 170 | /* |
| 171 | * If a match existed, then find an appropriate portal |
| 172 | * otherwise simply return ENOENT. |
| 173 | */ |
| 174 | if (v) { |
| 175 | error = activate_argv(&pcred, key, v, so, &fd); |
| 176 | if (error) |
| 177 | fd = -1; |
| 178 | else if (fd < 0) |
| 179 | error = -1; |
| 180 | } else { |
| 181 | error = ENOENT; |
| 182 | } |
| 183 | |
| 184 | if (error >= 0) |
| 185 | send_reply(so, fd, error); |
| 186 | |
| 187 | drop:; |
| 188 | close(so); |
| 189 | } |