404 lines
7.8 KiB
C
404 lines
7.8 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <time.h>
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#include <sys/fcntl.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <arpa/inet.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/select.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/netif/datagram.h>
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/*
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* Client side.
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*/
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#define OSMO_DGRAM_CLI_F_RECONF (1 << 0)
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struct osmo_dgram_tx {
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struct osmo_fd ofd;
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struct llist_head tx_queue;
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const char *addr;
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uint16_t port;
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int (*write_cb)(struct osmo_dgram_tx *conn);
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void *data;
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unsigned int flags;
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};
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void osmo_dgram_tx_close(struct osmo_dgram_tx *conn)
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{
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osmo_fd_unregister(&conn->ofd);
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close(conn->ofd.fd);
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}
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static int osmo_dgram_tx_write(struct osmo_dgram_tx *conn)
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{
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struct msgb *msg;
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struct llist_head *lh;
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int ret;
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LOGP(DLINP, LOGL_DEBUG, "sending data\n");
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if (llist_empty(&conn->tx_queue)) {
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conn->ofd.when &= ~BSC_FD_WRITE;
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return 0;
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}
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lh = conn->tx_queue.next;
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llist_del(lh);
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msg = llist_entry(lh, struct msgb, list);
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ret = send(conn->ofd.fd, msg->data, msg->len, 0);
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if (ret < 0) {
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LOGP(DLINP, LOGL_ERROR, "error to send (%s)\n",
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strerror(errno));
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}
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msgb_free(msg);
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return 0;
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}
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static int osmo_dgram_tx_fd_cb(struct osmo_fd *ofd, unsigned int what)
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{
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struct osmo_dgram_tx *conn = ofd->data;
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if (what & BSC_FD_WRITE) {
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LOGP(DLINP, LOGL_DEBUG, "write\n");
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osmo_dgram_tx_write(conn);
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}
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return 0;
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}
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struct osmo_dgram_tx *osmo_dgram_tx_create(void *crx)
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{
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struct osmo_dgram_tx *conn;
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conn = talloc_zero(crx, struct osmo_dgram_tx);
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if (!conn)
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return NULL;
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conn->ofd.fd = -1;
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conn->ofd.when |= BSC_FD_READ;
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conn->ofd.priv_nr = 0; /* XXX */
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conn->ofd.cb = osmo_dgram_tx_fd_cb;
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conn->ofd.data = conn;
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INIT_LLIST_HEAD(&conn->tx_queue);
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return conn;
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}
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void
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osmo_dgram_tx_set_addr(struct osmo_dgram_tx *conn,
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const char *addr)
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{
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if (conn->addr != NULL)
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talloc_free((void *)conn->addr);
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conn->addr = talloc_strdup(conn, addr);
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conn->flags |= OSMO_DGRAM_CLI_F_RECONF;
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}
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void
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osmo_dgram_tx_set_port(struct osmo_dgram_tx *conn,
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uint16_t port)
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{
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conn->port = port;
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conn->flags |= OSMO_DGRAM_CLI_F_RECONF;
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}
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void
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osmo_dgram_tx_set_data(struct osmo_dgram_tx *conn, void *data)
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{
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conn->data = data;
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}
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void osmo_dgram_tx_destroy(struct osmo_dgram_tx *conn)
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{
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talloc_free(conn);
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}
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int osmo_dgram_tx_open(struct osmo_dgram_tx *conn)
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{
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int ret;
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/* we are reconfiguring this socket, close existing first. */
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if ((conn->flags & OSMO_DGRAM_CLI_F_RECONF) && conn->ofd.fd >= 0)
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osmo_dgram_tx_close(conn);
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conn->flags &= ~OSMO_DGRAM_CLI_F_RECONF;
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ret = osmo_sock_init(AF_INET, SOCK_DGRAM, IPPROTO_UDP,
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conn->addr, conn->port,
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OSMO_SOCK_F_CONNECT|OSMO_SOCK_F_NONBLOCK);
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if (ret < 0)
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return ret;
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conn->ofd.fd = ret;
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if (osmo_fd_register(&conn->ofd) < 0) {
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close(ret);
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return -EIO;
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}
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return 0;
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}
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void osmo_dgram_tx_send(struct osmo_dgram_tx *conn,
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struct msgb *msg)
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{
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msgb_enqueue(&conn->tx_queue, msg);
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conn->ofd.when |= BSC_FD_WRITE;
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}
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/*
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* Server side.
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*/
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#define OSMO_DGRAM_RX_F_RECONF (1 << 0)
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struct osmo_dgram_rx {
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struct osmo_fd ofd;
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const char *addr;
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uint16_t port;
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int (*cb)(struct osmo_dgram_rx *conn);
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void *data;
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unsigned int flags;
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};
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int osmo_dgram_rx_recv(struct osmo_dgram_rx *conn,
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struct msgb *msg)
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{
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int ret;
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ret = recv(conn->ofd.fd, msg->data, msg->data_len, 0);
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if (ret <= 0) {
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LOGP(DLINP, LOGL_ERROR, "error receiving data from tx\n");
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return ret;
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}
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msgb_put(msg, ret);
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LOGP(DLINP, LOGL_DEBUG, "received %d bytes from tx\n", ret);
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return ret;
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}
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static void osmo_dgram_rx_read(struct osmo_dgram_rx *conn)
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{
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LOGP(DLINP, LOGL_DEBUG, "message received\n");
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if (conn->cb)
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conn->cb(conn);
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}
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static int osmo_dgram_rx_cb(struct osmo_fd *ofd, unsigned int what)
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{
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struct osmo_dgram_rx *conn = ofd->data;
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LOGP(DLINP, LOGL_DEBUG, "read\n");
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if (what & BSC_FD_READ)
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osmo_dgram_rx_read(conn);
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return 0;
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}
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struct osmo_dgram_rx *osmo_dgram_rx_create(void *crx)
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{
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struct osmo_dgram_rx *conn;
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conn = talloc_zero(crx, struct osmo_dgram_rx);
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if (!conn)
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return NULL;
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conn->ofd.fd = -1;
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conn->ofd.when |= BSC_FD_READ;
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conn->ofd.cb = osmo_dgram_rx_cb;
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conn->ofd.data = conn;
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return conn;
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}
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void osmo_dgram_rx_set_addr(struct osmo_dgram_rx *conn,
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const char *addr)
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{
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if (conn->addr != NULL)
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talloc_free((void *)conn->addr);
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conn->addr = talloc_strdup(conn, addr);
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conn->flags |= OSMO_DGRAM_RX_F_RECONF;
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}
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void osmo_dgram_rx_set_port(struct osmo_dgram_rx *conn,
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uint16_t port)
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{
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conn->port = port;
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conn->flags |= OSMO_DGRAM_RX_F_RECONF;
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}
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void osmo_dgram_rx_set_read_cb(struct osmo_dgram_rx *conn,
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int (*read_cb)(struct osmo_dgram_rx *conn))
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{
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conn->cb = read_cb;
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}
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void osmo_dgram_rx_destroy(struct osmo_dgram_rx *conn)
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{
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talloc_free(conn);
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}
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int osmo_dgram_rx_open(struct osmo_dgram_rx *conn)
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{
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int ret;
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/* we are reconfiguring this socket, close existing first. */
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if ((conn->flags & OSMO_DGRAM_RX_F_RECONF) && conn->ofd.fd >= 0)
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osmo_dgram_rx_close(conn);
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conn->flags &= ~OSMO_DGRAM_RX_F_RECONF;
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ret = osmo_sock_init(AF_INET, SOCK_DGRAM, IPPROTO_UDP,
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conn->addr, conn->port, OSMO_SOCK_F_BIND);
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if (ret < 0)
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return ret;
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conn->ofd.fd = ret;
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if (osmo_fd_register(&conn->ofd) < 0) {
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close(ret);
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return -EIO;
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}
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return 0;
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}
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void osmo_dgram_rx_close(struct osmo_dgram_rx *conn)
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{
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osmo_fd_unregister(&conn->ofd);
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close(conn->ofd.fd);
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}
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/*
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* Client+Server (bidirectional communications).
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*/
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struct osmo_dgram {
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struct osmo_dgram_rx *rx;
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struct osmo_dgram_tx *tx;
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int (*read_cb)(struct osmo_dgram *conn);
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void *data;
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};
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static int
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dgram_rx_cb(struct osmo_dgram_rx *rx)
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{
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struct osmo_dgram *conn = rx->data;
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if (conn->read_cb)
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return conn->read_cb(conn);
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return 0;
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}
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struct osmo_dgram *osmo_dgram_create(void *crx)
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{
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struct osmo_dgram *conn;
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conn = talloc_zero(crx, struct osmo_dgram);
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if (!conn)
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return NULL;
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conn->rx= osmo_dgram_rx_create(crx);
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if (conn->rx == NULL)
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return NULL;
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osmo_dgram_rx_set_read_cb(conn->rx, dgram_rx_cb);
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conn->rx->data = conn;
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conn->tx = osmo_dgram_tx_create(crx);
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if (conn->tx == NULL) {
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osmo_dgram_rx_destroy(conn->rx);
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return NULL;
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}
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return conn;
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}
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void osmo_dgram_destroy(struct osmo_dgram *conn)
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{
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osmo_dgram_rx_destroy(conn->rx);
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osmo_dgram_tx_destroy(conn->tx);
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}
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void
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osmo_dgram_set_local_addr(struct osmo_dgram *conn, const char *addr)
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{
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osmo_dgram_rx_set_addr(conn->rx, addr);
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}
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void
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osmo_dgram_set_remote_addr(struct osmo_dgram *conn, const char *addr)
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{
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osmo_dgram_tx_set_addr(conn->tx, addr);
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}
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void
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osmo_dgram_set_local_port(struct osmo_dgram *conn, uint16_t port)
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{
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osmo_dgram_rx_set_port(conn->rx, port);
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}
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void
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osmo_dgram_set_remote_port(struct osmo_dgram *conn, uint16_t port)
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{
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osmo_dgram_tx_set_port(conn->tx, port);
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}
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void osmo_dgram_set_read_cb(struct osmo_dgram *conn,
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int (*read_cb)(struct osmo_dgram *conn))
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{
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conn->read_cb = read_cb;
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}
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void osmo_dgram_set_data(struct osmo_dgram *conn, void *data)
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{
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conn->data = data;
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}
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void *osmo_dgram_get_data(struct osmo_dgram *conn)
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{
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return conn->data;
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}
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int osmo_dgram_open(struct osmo_dgram *conn)
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{
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int ret;
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ret = osmo_dgram_rx_open(conn->rx);
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if (ret < 0)
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return ret;
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ret = osmo_dgram_tx_open(conn->tx);
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if (ret < 0) {
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osmo_dgram_rx_close(conn->rx);
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return ret;
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}
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return ret;
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}
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void osmo_dgram_close(struct osmo_dgram *conn)
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{
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osmo_dgram_rx_close(conn->rx);
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osmo_dgram_tx_close(conn->tx);
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}
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void osmo_dgram_send(struct osmo_dgram *conn, struct msgb *msg)
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{
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osmo_dgram_tx_send(conn->tx, msg);
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}
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int osmo_dgram_recv(struct osmo_dgram *conn, struct msgb *msg)
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{
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return osmo_dgram_rx_recv(conn->rx, msg);
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}
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