Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 1 | /* Routines to talk to the MSC using the IPA Protocol */ |
| 2 | /* |
| 3 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
Holger Hans Peter Freyther | df6143a | 2010-06-15 18:46:56 +0800 | [diff] [blame] | 4 | * (C) 2010 by On-Waves |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <openbsc/bsc_msc.h> |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 24 | #include <openbsc/debug.h> |
| 25 | |
| 26 | #include <osmocore/write_queue.h> |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 27 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 28 | |
| 29 | #include <arpa/inet.h> |
| 30 | #include <sys/socket.h> |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 31 | #include <errno.h> |
| 32 | #include <fcntl.h> |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 33 | #include <stdio.h> |
| 34 | #include <string.h> |
| 35 | #include <unistd.h> |
| 36 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 37 | static void connection_loss(struct bsc_msc_connection *con) |
| 38 | { |
| 39 | struct bsc_fd *fd; |
| 40 | |
| 41 | fd = &con->write_queue.bfd; |
| 42 | |
| 43 | close(fd->fd); |
| 44 | fd->fd = -1; |
| 45 | fd->cb = write_queue_bfd_cb; |
| 46 | fd->when = 0; |
| 47 | |
| 48 | con->is_connected = 0; |
| 49 | con->connection_loss(con); |
| 50 | } |
| 51 | |
Holger Hans Peter Freyther | 0176eb4 | 2010-04-08 11:12:32 +0200 | [diff] [blame] | 52 | static int bsc_msc_except(struct bsc_fd *bfd) |
| 53 | { |
| 54 | struct write_queue *wrt; |
| 55 | struct bsc_msc_connection *con; |
| 56 | |
| 57 | LOGP(DMSC, LOGL_ERROR, "Exception on the BFD. Closing down.\n"); |
| 58 | |
| 59 | wrt = container_of(bfd, struct write_queue, bfd); |
| 60 | con = container_of(wrt, struct bsc_msc_connection, write_queue); |
| 61 | |
| 62 | connection_loss(con); |
| 63 | return 0; |
| 64 | } |
| 65 | |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 66 | /* called in the case of a non blocking connect */ |
| 67 | static int msc_connection_connect(struct bsc_fd *fd, unsigned int what) |
| 68 | { |
| 69 | int rc; |
| 70 | int val; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 71 | struct bsc_msc_connection *con; |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 72 | struct write_queue *queue; |
| 73 | |
| 74 | socklen_t len = sizeof(val); |
| 75 | |
| 76 | if ((what & BSC_FD_WRITE) == 0) { |
| 77 | LOGP(DMSC, LOGL_ERROR, "Callback but not readable.\n"); |
| 78 | return -1; |
| 79 | } |
| 80 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 81 | queue = container_of(fd, struct write_queue, bfd); |
| 82 | con = container_of(queue, struct bsc_msc_connection, write_queue); |
| 83 | |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 84 | /* check the socket state */ |
| 85 | rc = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &val, &len); |
| 86 | if (rc != 0) { |
| 87 | LOGP(DMSC, LOGL_ERROR, "getsockopt for the MSC socket failed.\n"); |
| 88 | goto error; |
| 89 | } |
| 90 | if (val != 0) { |
Holger Hans Peter Freyther | 9d90da9 | 2010-04-06 10:25:00 +0200 | [diff] [blame] | 91 | LOGP(DMSC, LOGL_ERROR, "Not connected to the MSC: %d\n", val); |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 92 | goto error; |
| 93 | } |
| 94 | |
| 95 | |
| 96 | /* go to full operation */ |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 97 | fd->cb = write_queue_bfd_cb; |
Holger Hans Peter Freyther | 0176eb4 | 2010-04-08 11:12:32 +0200 | [diff] [blame] | 98 | fd->when = BSC_FD_READ | BSC_FD_EXCEPT; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 99 | |
| 100 | con->is_connected = 1; |
Holger Hans Peter Freyther | b9ac37d | 2010-04-05 17:58:52 +0200 | [diff] [blame] | 101 | LOGP(DMSC, LOGL_NOTICE, "(Re)Connected to the MSC.\n"); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 102 | if (con->connected) |
| 103 | con->connected(con); |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 104 | return 0; |
| 105 | |
| 106 | error: |
| 107 | bsc_unregister_fd(fd); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 108 | connection_loss(con); |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 109 | return -1; |
| 110 | } |
| 111 | static void setnonblocking(struct bsc_fd *fd) |
| 112 | { |
| 113 | int flags; |
| 114 | |
| 115 | flags = fcntl(fd->fd, F_GETFL); |
| 116 | if (flags < 0) { |
| 117 | perror("fcntl get failed"); |
| 118 | close(fd->fd); |
| 119 | fd->fd = -1; |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | flags |= O_NONBLOCK; |
| 124 | flags = fcntl(fd->fd, F_SETFL, flags); |
| 125 | if (flags < 0) { |
| 126 | perror("fcntl get failed"); |
| 127 | close(fd->fd); |
| 128 | fd->fd = -1; |
| 129 | return; |
| 130 | } |
| 131 | } |
| 132 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 133 | int bsc_msc_connect(struct bsc_msc_connection *con) |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 134 | { |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 135 | struct bsc_fd *fd; |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 136 | struct sockaddr_in sin; |
| 137 | int on = 1, ret; |
| 138 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 139 | LOGP(DMSC, LOGL_NOTICE, "Attempting to connect MSC at %s:%d\n", con->ip, con->port); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 140 | |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 141 | con->is_connected = 0; |
| 142 | |
| 143 | fd = &con->write_queue.bfd; |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 144 | fd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 145 | fd->data = NULL; |
| 146 | fd->priv_nr = 1; |
| 147 | |
| 148 | if (fd->fd < 0) { |
| 149 | perror("Creating TCP socket failed"); |
| 150 | return fd->fd; |
| 151 | } |
| 152 | |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 153 | /* make it non blocking */ |
| 154 | setnonblocking(fd); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 155 | |
| 156 | memset(&sin, 0, sizeof(sin)); |
| 157 | sin.sin_family = AF_INET; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 158 | sin.sin_port = htons(con->port); |
| 159 | inet_aton(con->ip, &sin.sin_addr); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 160 | |
| 161 | setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 162 | ret = connect(fd->fd, (struct sockaddr *) &sin, sizeof(sin)); |
| 163 | |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 164 | if (ret == -1 && errno == EINPROGRESS) { |
| 165 | LOGP(DMSC, LOGL_ERROR, "MSC Connection in progress\n"); |
| 166 | fd->when = BSC_FD_WRITE; |
| 167 | fd->cb = msc_connection_connect; |
| 168 | } else if (ret < 0) { |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 169 | perror("Connection failed"); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 170 | connection_loss(con); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 171 | return ret; |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 172 | } else { |
Holger Hans Peter Freyther | 0176eb4 | 2010-04-08 11:12:32 +0200 | [diff] [blame] | 173 | fd->when = BSC_FD_READ | BSC_FD_EXCEPT; |
Holger Hans Peter Freyther | 6c0a04e | 2010-03-26 10:41:20 +0100 | [diff] [blame] | 174 | fd->cb = write_queue_bfd_cb; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 175 | con->is_connected = 1; |
| 176 | if (con->connected) |
| 177 | con->connected(con); |
Holger Hans Peter Freyther | eef86b5 | 2010-06-15 18:45:06 +0800 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | ret = bsc_register_fd(fd); |
| 181 | if (ret < 0) { |
| 182 | perror("Registering the fd failed"); |
| 183 | close(fd->fd); |
| 184 | return ret; |
| 185 | } |
| 186 | |
| 187 | return ret; |
| 188 | } |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 189 | |
| 190 | struct bsc_msc_connection *bsc_msc_create(const char *ip, int port) |
| 191 | { |
| 192 | struct bsc_msc_connection *con; |
| 193 | |
| 194 | con = talloc_zero(NULL, struct bsc_msc_connection); |
| 195 | if (!con) { |
| 196 | LOGP(DMSC, LOGL_FATAL, "Failed to create the MSC connection.\n"); |
| 197 | return NULL; |
| 198 | } |
| 199 | |
| 200 | con->ip = ip; |
| 201 | con->port = port; |
| 202 | write_queue_init(&con->write_queue, 100); |
Holger Hans Peter Freyther | 0176eb4 | 2010-04-08 11:12:32 +0200 | [diff] [blame] | 203 | con->write_queue.except_cb = bsc_msc_except; |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 204 | return con; |
| 205 | } |
| 206 | |
| 207 | void bsc_msc_lost(struct bsc_msc_connection *con) |
| 208 | { |
Holger Hans Peter Freyther | 03ca97e | 2010-03-31 13:15:26 +0200 | [diff] [blame] | 209 | write_queue_clear(&con->write_queue); |
Holger Hans Peter Freyther | baf2abe | 2010-06-15 18:47:29 +0800 | [diff] [blame] | 210 | bsc_unregister_fd(&con->write_queue.bfd); |
| 211 | connection_loss(con); |
| 212 | } |
| 213 | |
| 214 | static void reconnect_msc(void *_msc) |
| 215 | { |
| 216 | struct bsc_msc_connection *con = _msc; |
| 217 | |
| 218 | LOGP(DMSC, LOGL_NOTICE, "Attempting to reconnect to the MSC.\n"); |
| 219 | bsc_msc_connect(con); |
| 220 | } |
| 221 | |
| 222 | void bsc_msc_schedule_connect(struct bsc_msc_connection *con) |
| 223 | { |
| 224 | LOGP(DMSC, LOGL_NOTICE, "Attempting to reconnect to the MSC.\n"); |
| 225 | con->reconnect_timer.cb = reconnect_msc; |
| 226 | con->reconnect_timer.data = con; |
| 227 | bsc_schedule_timer(&con->reconnect_timer, 5, 0); |
| 228 | } |