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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <gsmd/gsmd.h>
#include <gsmd/usock.h>
#include "gsmd.h"
#include "select.h"
#include "atcmd.h"
#include "usock.h"
/* callback for completed passthrough gsmd_atcmd's */
static int usock_cmd_cb(struct gsmd_atcmd *cmd, void *ctx)
{
struct gsmd_user *gu = ctx;
struct gsmd_ucmd *ucmd = malloc(sizeof(*ucmd)+cmd->buflen);
if (!ucmd)
return -ENOMEM;
ucmd->hdr.version = GSMD_PROTO_VERSION;
ucmd->hdr.msg_type = GSMD_MSG_PASSTHROUGH;
ucmd->hdr.msg_subtype = GSMD_PASSTHROUGH_RESP;
ucmd->hdr.len = cmd->buflen;
memcpy(ucmd->buf, cmd->buf, ucmd->hdr.len);
/* add to per-user list of finished cmds */
llist_add_tail(&ucmd->list, &gu->finished_ucmds);
/* mark socket of user as we-want-to-write */
gu->gfd.when |= GSMD_FD_WRITE;
return 0;
}
static int usock_rcv_pcmd(struct gsmd_user *gu, char *buf, int len)
{
struct gsmd_msg_hdr *gph = (struct gsmd_msg_hdr *)buf;
if (gph->version != GSMD_PROTO_VERSION)
return -EINVAL;
switch (gph->msg_type) {
case GSMD_MSG_PASSTHROUGH:
{
struct gsmd_atcmd *cmd;
cmd = atcmd_fill((char *)gph+sizeof(*gph),
255, &usock_cmd_cb, gu);
if (!cmd)
return -ENOMEM;
return atcmd_submit(gu->gsmd, cmd);
}
break;
case GSMD_PCMD_EVT_SUBSCRIPTIONS:
{
u_int32_t *evtmask = (u_int32_t *) (buf + sizeof(*gph));
if (len < sizeof(*gph) + sizeof(u_int32_t))
return -EINVAL;
gu->subscriptions = *evtmask;
}
break;
default:
return -EINVAL;
}
return 0;
}
/* callback for read/write on client (libgsmd) socket */
static int gsmd_usock_user_cb(int fd, unsigned int what, void *data)
{
struct gsmd_user *gu = data;
/* FIXME: check some kind of backlog and limit it */
if (what & GSMD_FD_READ) {
char buf[1024];
int rcvlen;
/* read data from socket, determine what he wants */
rcvlen = read(fd, buf, sizeof(buf));
if (rcvlen == 0) {
/* EOF, this client has just vanished */
gsmd_unregister_fd(&gu->gfd);
close(fd);
/* destroy whole user structure */
llist_del(&gu->list);
/* FIXME: delete budy ucmds from finished_ucmds */
return 0;
} else if (rcvlen < 0)
return rcvlen;
else
return usock_rcv_pcmd(gu, buf, rcvlen);
}
if (what & GSMD_FD_WRITE) {
/* write data from pending replies to socket */
struct gsmd_ucmd *ucmd, *uctmp;
llist_for_each_entry_safe(ucmd, uctmp, &gu->finished_ucmds,
list) {
int rc;
rc = write(fd, &ucmd->hdr, sizeof(ucmd->hdr) + ucmd->hdr.len);
if (rc < 0) {
DEBUGP("write return %d\n", rc);
return rc;
}
if (rc == 0) {
DEBUGP("write returns zero!!\n");
break;
}
if (rc != sizeof(ucmd->hdr) + ucmd->hdr.len) {
DEBUGP("short write\n");
break;
}
llist_del(&ucmd->list);
free(ucmd);
}
}
return 0;
}
/* callback for read on master-listen-socket */
static int gsmd_usock_cb(int fd, unsigned int what, void *data)
{
struct gsmd *g = data;
struct gsmd_user *newuser;
/* FIXME: implement this */
if (what & GSMD_FD_READ) {
/* new incoming connection */
newuser = malloc(sizeof(*newuser));
if (!newuser)
return -ENOMEM;
newuser->gfd.fd = accept(fd, NULL, 0);
if (newuser->gfd.fd < 0) {
DEBUGP("error accepting incoming conn: `%s'\n",
strerror(errno));
free(newuser);
}
newuser->gfd.when = GSMD_FD_READ;
newuser->gfd.data = newuser;
newuser->gfd.cb = &gsmd_usock_user_cb;
newuser->gsmd = g;
llist_add(&newuser->list, &g->users);
gsmd_register_fd(&newuser->gfd);
}
return 0;
}
/* handling of socket with incoming client connections */
int usock_init(struct gsmd *g)
{
struct sockaddr_un sun;
int fd, rc;
fd = socket(PF_UNIX, GSMD_UNIX_SOCKET_TYPE, 0);
if (fd < 0)
return fd;
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
memcpy(sun.sun_path, GSMD_UNIX_SOCKET, sizeof(GSMD_UNIX_SOCKET));
rc = bind(fd, (struct sockaddr *)&sun, sizeof(sun));
if (rc < 0) {
close(fd);
return rc;
}
rc = listen(fd, 10);
if (rc < 0) {
close(fd);
return rc;
}
g->gfd_sock.fd = fd;
g->gfd_sock.when = GSMD_FD_READ | GSMD_FD_EXCEPT;
g->gfd_sock.data = g;
g->gfd_sock.cb = &gsmd_usock_cb;
return gsmd_register_fd(&g->gfd_sock);
}
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