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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <gsmd/usock.h>
#include <libgsmd/libgsmd.h>
#include "lgsm_internals.h"
static int lgsm_get_packet(struct lgsm_handle *lh)
{
static char buf[GSMD_MSGSIZE_MAX];
struct gsmd_msg_hdr *hdr = (struct gsmd_msg_hdr *) buf;
int rc = read(lh->fd, buf, sizeof(buf));
if (rc <= 0)
return rc;
if (hdr->version != GSMD_PROTO_VERSION)
return -EINVAL;
switch (hdr->msg_type) {
case GSMD_MSG_PASSTHROUGH:
break;
default:
return -EINVAL;
}
return 0;
}
static int lgsm_open_backend(struct lgsm_handle *lh, const char *device)
{
int rc;
if (!strcmp(device, LGSMD_DEVICE_GSMD)) {
struct sockaddr_un sun;
/* use unix domain socket to gsm daemon */
lh->fd = socket(PF_UNIX, GSMD_UNIX_SOCKET_TYPE, 0);
if (lh->fd < 0)
return lh->fd;
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
memcpy(sun.sun_path, GSMD_UNIX_SOCKET, sizeof(GSMD_UNIX_SOCKET));
rc = connect(lh->fd, (struct sockaddr *)&sun, sizeof(sun));
if (rc < 0) {
close(lh->fd);
lh->fd = -1;
return rc;
}
} else
return -EINVAL;
return 0;
}
/* handle a packet that was received on the gsmd socket */
int lgsm_handle_packet(struct lgsm_handle *lh, char *buf, int len)
{
struct gsmd_msg_hdr *gmh = (struct gsmd_msg_hdr *)buf;
lgsm_msg_handler *handler;
if (len < sizeof(*gmh))
return -EINVAL;
if (len - sizeof(*gmh) < gmh->len)
return -EINVAL;
if (gmh->msg_type >= __NUM_GSMD_MSGS)
return -EINVAL;
handler = lh->handler[gmh->msg_type];
if (handler)
return handler(lh, gmh);
else {
fprintf(stderr, "unable to handle packet type=%u\n", gmh->msg_type);
return 0;
}
}
int lgsm_register_handler(struct lgsm_handle *lh, int type, lgsm_msg_handler *handler)
{
if (type >= __NUM_GSMD_MSGS)
return -EINVAL;
lh->handler[type] = handler;
return 0;
}
void lgsm_unregister_handler(struct lgsm_handle *lh, int type)
{
if (type < __NUM_GSMD_MSGS)
lh->handler[type] = NULL;
}
/* blocking read and processing of packets until packet matching 'id' is found */
int lgsm_blocking_wait_packet(struct lgsm_handle *lh, u_int16_t id,
struct gsmd_msg_hdr *gmh, int rlen)
{
int rc;
fd_set readset;
FD_ZERO(&readset);
while (1) {
FD_SET(lh->fd, &readset);
rc = select(lh->fd+1, &readset, NULL, NULL, NULL);
if (rc <= 0)
return rc;
rc = read(lh->fd, (char *)gmh, rlen);
if (rc <= 0)
return rc;
if (gmh->id == id) {
/* we've found the matching packet, return to calling function */
return rc;
} else
rc = lgsm_handle_packet(lh, (char *)gmh, rc);
}
}
int lgsm_fd(struct lgsm_handle *lh)
{
return lh->fd;
}
struct lgsm_handle *lgsm_init(const char *device)
{
struct lgsm_handle *lh = malloc(sizeof(*lh));
memset(lh, 0, sizeof(*lh));
lh->fd = -1;
if (lgsm_open_backend(lh, device) < 0) {
free(lh);
return NULL;
}
lgsm_evt_init(lh);
return lh;
}
int lgsm_exit(struct lgsm_handle *lh)
{
free(lh);
return 0;
}
static u_int16_t next_msg_id;
int lgsm_send(struct lgsm_handle *lh, struct gsmd_msg_hdr *gmh)
{
gmh->id = next_msg_id++;
return send(lh->fd, (char *) gmh, sizeof(*gmh) + gmh->len, 0);
}
struct gsmd_msg_hdr *lgsm_gmh_fill(int type, int subtype, int payload_len)
{
struct gsmd_msg_hdr *gmh = malloc(sizeof(*gmh)+payload_len);
if (!gmh)
return NULL;
memset(gmh, 0, sizeof(*gmh));
gmh->version = GSMD_PROTO_VERSION;
gmh->msg_type = type;
gmh->msg_subtype = subtype;
gmh->len = payload_len;
return gmh;
}
int lgsm_pin(struct lgsm_handle *lh, char *pin)
{
int rc;
struct gsmd_msg_hdr *gmh;
gmh = lgsm_gmh_fill(GSMD_MSG_PIN, GSMD_PIN_INPUT, strlen(pin)+1);
if (!gmh)
return -ENOMEM;
gmh->data[0] = '\0';
strcat(gmh->data, pin);
rc = lgsm_send(lh, gmh);
free(gmh);
return rc;
}
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