Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 1 | #include "internal.h" |
| 2 | |
| 3 | #include <stdio.h> |
| 4 | #include <unistd.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <errno.h> |
| 7 | #include <string.h> |
| 8 | #include <time.h> |
| 9 | #include <sys/fcntl.h> |
| 10 | #include <sys/socket.h> |
| 11 | #include <sys/ioctl.h> |
| 12 | #include <arpa/inet.h> |
| 13 | |
| 14 | #include <osmocom/core/select.h> |
| 15 | #include <osmocom/gsm/tlv.h> |
| 16 | #include <osmocom/core/msgb.h> |
| 17 | #include <osmocom/core/logging.h> |
| 18 | #include <talloc.h> |
| 19 | #include <osmocom/abis/e1_input.h> |
| 20 | #include <osmocom/abis/ipaccess.h> |
| 21 | #include <osmocom/core/socket.h> |
| 22 | #include <osmocom/abis/logging.h> |
| 23 | |
| 24 | #include <osmocom/abis/ipa.h> |
| 25 | |
| 26 | #define IPA_ALLOC_SIZE 1200 |
| 27 | |
| 28 | static struct msgb *ipa_msg_alloc(void) |
| 29 | { |
| 30 | return msgb_alloc(IPA_ALLOC_SIZE, "Abis/IP"); |
| 31 | } |
| 32 | |
| 33 | int ipa_msg_recv(int fd, struct msgb **rmsg) |
| 34 | { |
| 35 | struct msgb *msg; |
| 36 | struct ipaccess_head *hh; |
| 37 | int len, ret; |
| 38 | |
| 39 | msg = ipa_msg_alloc(); |
| 40 | if (msg == NULL) |
| 41 | return -ENOMEM; |
| 42 | |
| 43 | /* first read our 3-byte header */ |
| 44 | hh = (struct ipaccess_head *) msg->data; |
| 45 | ret = recv(fd, msg->data, sizeof(*hh), 0); |
| 46 | if (ret <= 0) { |
| 47 | msgb_free(msg); |
| 48 | return ret; |
| 49 | } else if (ret != sizeof(*hh)) { |
| 50 | msgb_free(msg); |
| 51 | return -EIO; |
| 52 | } |
| 53 | msgb_put(msg, ret); |
| 54 | |
| 55 | /* then read the length as specified in header */ |
| 56 | msg->l2h = msg->data + sizeof(*hh); |
| 57 | len = ntohs(hh->len); |
| 58 | |
| 59 | if (len < 0 || IPA_ALLOC_SIZE < len + sizeof(*hh)) { |
| 60 | msgb_free(msg); |
| 61 | return -EIO; |
| 62 | } |
| 63 | |
| 64 | ret = recv(fd, msg->l2h, len, 0); |
| 65 | if (ret <= 0) { |
| 66 | msgb_free(msg); |
| 67 | return ret; |
| 68 | } else if (ret < len) { |
| 69 | msgb_free(msg); |
| 70 | return -EIO; |
| 71 | } |
| 72 | msgb_put(msg, ret); |
| 73 | *rmsg = msg; |
| 74 | return ret; |
| 75 | } |
| 76 | |
| 77 | void ipa_client_link_close(struct ipa_link *link); |
| 78 | |
| 79 | static void ipa_client_retry(struct ipa_link *link) |
| 80 | { |
| 81 | LOGP(DINP, LOGL_NOTICE, "connection closed\n"); |
| 82 | ipa_client_link_close(link); |
| 83 | LOGP(DINP, LOGL_NOTICE, "retrying in 5 seconds...\n"); |
| 84 | osmo_timer_schedule(&link->timer, 5, 0); |
| 85 | link->state = IPA_LINK_STATE_CONNECTING; |
| 86 | } |
| 87 | |
| 88 | void ipa_client_link_close(struct ipa_link *link) |
| 89 | { |
| 90 | osmo_fd_unregister(&link->ofd); |
| 91 | close(link->ofd.fd); |
| 92 | } |
| 93 | |
| 94 | static void ipa_client_read(struct ipa_link *link) |
| 95 | { |
| 96 | struct osmo_fd *ofd = &link->ofd; |
| 97 | struct msgb *msg; |
| 98 | int ret; |
| 99 | |
| 100 | LOGP(DINP, LOGL_NOTICE, "message received\n"); |
| 101 | |
| 102 | ret = ipa_msg_recv(ofd->fd, &msg); |
| 103 | if (ret < 0) { |
| 104 | if (errno == EPIPE || errno == ECONNRESET) { |
| 105 | LOGP(DINP, LOGL_ERROR, "lost connection with server\n"); |
| 106 | } else { |
| 107 | LOGP(DINP, LOGL_ERROR, "unknown error\n"); |
| 108 | } |
| 109 | ipa_client_retry(link); |
| 110 | return; |
| 111 | } else if (ret == 0) { |
| 112 | LOGP(DINP, LOGL_ERROR, "connection closed with server\n"); |
| 113 | ipa_client_retry(link); |
| 114 | return; |
| 115 | } |
| 116 | if (link->process) |
| 117 | link->process(link, msg); |
| 118 | } |
| 119 | |
| 120 | static void ipa_client_write(struct ipa_link *link) |
| 121 | { |
| 122 | struct osmo_fd *ofd = &link->ofd; |
| 123 | struct msgb *msg; |
| 124 | struct llist_head *lh; |
| 125 | int ret; |
| 126 | |
| 127 | LOGP(DINP, LOGL_NOTICE, "sending data\n"); |
| 128 | |
| 129 | if (llist_empty(&link->tx_queue)) { |
| 130 | ofd->when &= ~BSC_FD_WRITE; |
| 131 | return; |
| 132 | } |
| 133 | lh = link->tx_queue.next; |
| 134 | llist_del(lh); |
| 135 | msg = llist_entry(lh, struct msgb, list); |
| 136 | |
| 137 | ret = send(link->ofd.fd, msg->data, msg->len, 0); |
| 138 | if (ret < 0) { |
| 139 | if (errno == EPIPE || errno == ENOTCONN) { |
| 140 | ipa_client_retry(link); |
| 141 | } |
| 142 | LOGP(DINP, LOGL_ERROR, "error to send\n"); |
| 143 | } |
| 144 | msgb_free(msg); |
| 145 | } |
| 146 | |
| 147 | int ipa_client_fd_cb(struct osmo_fd *ofd, unsigned int what) |
| 148 | { |
| 149 | struct ipa_link *link = ofd->data; |
| 150 | int error, ret; |
| 151 | size_t len = sizeof(error); |
| 152 | |
| 153 | switch(link->state) { |
| 154 | case IPA_LINK_STATE_CONNECTING: |
| 155 | ret = getsockopt(ofd->fd, SOL_SOCKET, SO_ERROR, &error, &len); |
| 156 | if (ret >= 0 && error > 0) { |
| 157 | ipa_client_retry(link); |
| 158 | return 0; |
| 159 | } |
| 160 | ofd->when &= ~BSC_FD_WRITE; |
| 161 | LOGP(DINP, LOGL_NOTICE, "connection done.\n"); |
| 162 | link->state = IPA_LINK_STATE_CONNECTED; |
| 163 | break; |
| 164 | case IPA_LINK_STATE_CONNECTED: |
| 165 | LOGP(DINP, LOGL_NOTICE, "connected read/write\n"); |
| 166 | if (what & BSC_FD_READ) |
| 167 | ipa_client_read(link); |
| 168 | if (what & BSC_FD_WRITE) |
| 169 | ipa_client_write(link); |
| 170 | break; |
| 171 | default: |
| 172 | break; |
| 173 | } |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | static void ipa_link_timer_cb(void *data); |
| 178 | |
Pablo Neira Ayuso | 9b3a33c | 2011-06-21 13:52:41 +0200 | [diff] [blame] | 179 | struct ipa_link * |
| 180 | ipa_client_link_create(void *ctx, const char *addr, uint16_t port) |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 181 | { |
| 182 | struct ipa_link *ipa_link; |
| 183 | |
| 184 | ipa_link = talloc_zero(ctx, struct ipa_link); |
| 185 | if (!ipa_link) |
| 186 | return NULL; |
| 187 | |
| 188 | ipa_link->ofd.when |= BSC_FD_READ | BSC_FD_WRITE; |
| 189 | ipa_link->ofd.cb = ipa_client_fd_cb; |
| 190 | ipa_link->ofd.data = ipa_link; |
| 191 | ipa_link->state = IPA_LINK_STATE_CONNECTING; |
| 192 | ipa_link->timer.cb = ipa_link_timer_cb; |
| 193 | ipa_link->timer.data = ipa_link; |
Pablo Neira Ayuso | c00ee73 | 2011-06-21 12:22:49 +0200 | [diff] [blame] | 194 | ipa_link->addr = talloc_strdup(ipa_link, addr); |
Pablo Neira Ayuso | 9b3a33c | 2011-06-21 13:52:41 +0200 | [diff] [blame] | 195 | ipa_link->port = port; |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 196 | |
| 197 | return ipa_link; |
| 198 | } |
| 199 | |
| 200 | void ipa_client_link_destroy(struct ipa_link *link) |
| 201 | { |
| 202 | talloc_free(link); |
| 203 | } |
| 204 | |
| 205 | int ipa_client_link_open(struct ipa_link *link) |
| 206 | { |
| 207 | int ret; |
| 208 | |
| 209 | ret = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP, |
Pablo Neira Ayuso | 9b3a33c | 2011-06-21 13:52:41 +0200 | [diff] [blame] | 210 | link->addr, link->port, |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 211 | OSMO_SOCK_F_CONNECT|OSMO_SOCK_F_NONBLOCK); |
| 212 | if (ret < 0) { |
| 213 | if (errno != EINPROGRESS) |
| 214 | return ret; |
| 215 | } |
| 216 | link->ofd.fd = ret; |
| 217 | if (osmo_fd_register(&link->ofd) < 0) { |
| 218 | close(ret); |
| 219 | return -EIO; |
| 220 | } |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static void ipa_link_timer_cb(void *data) |
| 225 | { |
| 226 | struct ipa_link *link = data; |
| 227 | |
| 228 | LOGP(DINP, LOGL_NOTICE, "reconnecting.\n"); |
| 229 | |
| 230 | switch(link->state) { |
| 231 | case IPA_LINK_STATE_CONNECTING: |
| 232 | ipa_client_link_open(link); |
| 233 | break; |
| 234 | default: |
| 235 | break; |
| 236 | } |
| 237 | } |