| #include "internal.h" |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <time.h> |
| #include <sys/fcntl.h> |
| #include <sys/socket.h> |
| #include <sys/ioctl.h> |
| #include <arpa/inet.h> |
| |
| #include <osmocom/core/select.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/logging.h> |
| #include <talloc.h> |
| #include <osmocom/abis/e1_input.h> |
| #include <osmocom/abis/ipaccess.h> |
| #include <osmocom/core/socket.h> |
| #include <osmocom/abis/logging.h> |
| |
| #include <osmocom/abis/ipa.h> |
| |
| #define IPA_ALLOC_SIZE 1200 |
| |
| static struct msgb *ipa_msg_alloc(void) |
| { |
| return msgb_alloc(IPA_ALLOC_SIZE, "Abis/IP"); |
| } |
| |
| int ipa_msg_recv(int fd, struct msgb **rmsg) |
| { |
| struct msgb *msg; |
| struct ipaccess_head *hh; |
| int len, ret; |
| |
| msg = ipa_msg_alloc(); |
| if (msg == NULL) |
| return -ENOMEM; |
| |
| /* first read our 3-byte header */ |
| hh = (struct ipaccess_head *) msg->data; |
| ret = recv(fd, msg->data, sizeof(*hh), 0); |
| if (ret <= 0) { |
| msgb_free(msg); |
| return ret; |
| } else if (ret != sizeof(*hh)) { |
| msgb_free(msg); |
| return -EIO; |
| } |
| msgb_put(msg, ret); |
| |
| /* then read the length as specified in header */ |
| msg->l2h = msg->data + sizeof(*hh); |
| len = ntohs(hh->len); |
| |
| if (len < 0 || IPA_ALLOC_SIZE < len + sizeof(*hh)) { |
| msgb_free(msg); |
| return -EIO; |
| } |
| |
| ret = recv(fd, msg->l2h, len, 0); |
| if (ret <= 0) { |
| msgb_free(msg); |
| return ret; |
| } else if (ret < len) { |
| msgb_free(msg); |
| return -EIO; |
| } |
| msgb_put(msg, ret); |
| *rmsg = msg; |
| return ret; |
| } |
| |
| void ipa_client_link_close(struct ipa_link *link); |
| |
| static void ipa_client_retry(struct ipa_link *link) |
| { |
| LOGP(DINP, LOGL_NOTICE, "connection closed\n"); |
| ipa_client_link_close(link); |
| LOGP(DINP, LOGL_NOTICE, "retrying in 5 seconds...\n"); |
| osmo_timer_schedule(&link->timer, 5, 0); |
| link->state = IPA_LINK_STATE_CONNECTING; |
| } |
| |
| void ipa_client_link_close(struct ipa_link *link) |
| { |
| osmo_fd_unregister(&link->ofd); |
| close(link->ofd.fd); |
| } |
| |
| static void ipa_client_read(struct ipa_link *link) |
| { |
| struct osmo_fd *ofd = &link->ofd; |
| struct msgb *msg; |
| int ret; |
| |
| LOGP(DINP, LOGL_NOTICE, "message received\n"); |
| |
| ret = ipa_msg_recv(ofd->fd, &msg); |
| if (ret < 0) { |
| if (errno == EPIPE || errno == ECONNRESET) { |
| LOGP(DINP, LOGL_ERROR, "lost connection with server\n"); |
| } else { |
| LOGP(DINP, LOGL_ERROR, "unknown error\n"); |
| } |
| ipa_client_retry(link); |
| return; |
| } else if (ret == 0) { |
| LOGP(DINP, LOGL_ERROR, "connection closed with server\n"); |
| ipa_client_retry(link); |
| return; |
| } |
| if (link->process) |
| link->process(link, msg); |
| } |
| |
| static void ipa_client_write(struct ipa_link *link) |
| { |
| struct osmo_fd *ofd = &link->ofd; |
| struct msgb *msg; |
| struct llist_head *lh; |
| int ret; |
| |
| LOGP(DINP, LOGL_NOTICE, "sending data\n"); |
| |
| if (llist_empty(&link->tx_queue)) { |
| ofd->when &= ~BSC_FD_WRITE; |
| return; |
| } |
| lh = link->tx_queue.next; |
| llist_del(lh); |
| msg = llist_entry(lh, struct msgb, list); |
| |
| ret = send(link->ofd.fd, msg->data, msg->len, 0); |
| if (ret < 0) { |
| if (errno == EPIPE || errno == ENOTCONN) { |
| ipa_client_retry(link); |
| } |
| LOGP(DINP, LOGL_ERROR, "error to send\n"); |
| } |
| msgb_free(msg); |
| } |
| |
| int ipa_client_fd_cb(struct osmo_fd *ofd, unsigned int what) |
| { |
| struct ipa_link *link = ofd->data; |
| int error, ret; |
| size_t len = sizeof(error); |
| |
| switch(link->state) { |
| case IPA_LINK_STATE_CONNECTING: |
| ret = getsockopt(ofd->fd, SOL_SOCKET, SO_ERROR, &error, &len); |
| if (ret >= 0 && error > 0) { |
| ipa_client_retry(link); |
| return 0; |
| } |
| ofd->when &= ~BSC_FD_WRITE; |
| LOGP(DINP, LOGL_NOTICE, "connection done.\n"); |
| link->state = IPA_LINK_STATE_CONNECTED; |
| break; |
| case IPA_LINK_STATE_CONNECTED: |
| LOGP(DINP, LOGL_NOTICE, "connected read/write\n"); |
| if (what & BSC_FD_READ) |
| ipa_client_read(link); |
| if (what & BSC_FD_WRITE) |
| ipa_client_write(link); |
| break; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| static void ipa_link_timer_cb(void *data); |
| |
| struct ipa_link * |
| ipa_client_link_create(void *ctx, const char *addr, uint16_t port) |
| { |
| struct ipa_link *ipa_link; |
| |
| ipa_link = talloc_zero(ctx, struct ipa_link); |
| if (!ipa_link) |
| return NULL; |
| |
| ipa_link->ofd.when |= BSC_FD_READ | BSC_FD_WRITE; |
| ipa_link->ofd.cb = ipa_client_fd_cb; |
| ipa_link->ofd.data = ipa_link; |
| ipa_link->state = IPA_LINK_STATE_CONNECTING; |
| ipa_link->timer.cb = ipa_link_timer_cb; |
| ipa_link->timer.data = ipa_link; |
| ipa_link->addr = talloc_strdup(ipa_link, addr); |
| ipa_link->port = port; |
| |
| return ipa_link; |
| } |
| |
| void ipa_client_link_destroy(struct ipa_link *link) |
| { |
| talloc_free(link); |
| } |
| |
| int ipa_client_link_open(struct ipa_link *link) |
| { |
| int ret; |
| |
| ret = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP, |
| link->addr, link->port, |
| OSMO_SOCK_F_CONNECT|OSMO_SOCK_F_NONBLOCK); |
| if (ret < 0) { |
| if (errno != EINPROGRESS) |
| return ret; |
| } |
| link->ofd.fd = ret; |
| if (osmo_fd_register(&link->ofd) < 0) { |
| close(ret); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| static void ipa_link_timer_cb(void *data) |
| { |
| struct ipa_link *link = data; |
| |
| LOGP(DINP, LOGL_NOTICE, "reconnecting.\n"); |
| |
| switch(link->state) { |
| case IPA_LINK_STATE_CONNECTING: |
| ipa_client_link_open(link); |
| break; |
| default: |
| break; |
| } |
| } |