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/*
* uqmid -- tiny QMI support implementation
*
* Copyright (C) 2024 Alexander Couzens <lynxis@fe80.eu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <libqmi-glib.h>
#include "gsmtapv3.h"
/* from osmo-qcdiag under GPLv2 */
/* A small wrapper around libqmi-glib to give us a human-readable string
* representation of QMI messages that we receive from DIAG */
static int dump_qmi_msg(const uint8_t *data, unsigned int len)
{
GByteArray *buffer;
GError *error = NULL;
QmiMessage *message;
gchar *printable;
buffer = g_byte_array_sized_new(len);
g_byte_array_append(buffer, data, len);
message = qmi_message_new_from_raw(buffer, &error);
if (!message) {
fprintf(stderr, "qmi_message_new_from_raw() returned NULL\n");
return -1;
}
printable = qmi_message_get_printable(message, "QMI ");
printf("<<<< QMI\n");
fputs(printable, stdout);
printf(">>>> QMI\n");
printf("\n");
g_free(printable);
return 0;
}
int main() {
int sfd, ret;
struct sockaddr_in in = {};
sfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sfd < 0) {
fprintf(stderr, "Failed to create socket! %d", ret);
return -1;
}
in.sin_addr.s_addr = 0;
in.sin_port = htons(GSMTAPV3_UDP_PORT);
in.sin_family = AF_INET;
ret = bind(sfd, (struct sockaddr *) &in, sizeof(struct sockaddr_in));
if (ret < 0) {
fprintf(stderr, "Failed to bind! %d", ret);
return -1;
}
struct gsmtap_hdr_v3 ghdr;
uint8_t buffer[4096];
ssize_t rs;
void *data;
while ((rs = recvfrom(sfd, buffer, sizeof(buffer), 0, NULL, 0)) >= 0) {
uint16_t hdrlen;
if (rs < sizeof(ghdr))
continue;
memcpy(&ghdr, buffer, sizeof(ghdr));
hdrlen = htons(ghdr.hdr_len) * 4;
if (hdrlen > rs)
continue;
if (ghdr.type != htons(GSMTAPV3_TYPE_BASEBAND_DIAG))
continue;
if (ghdr.sub_type != htons(GSMTAPV3_BASEBAND_DIAG_QUALCOMM))
continue;
if (hdrlen == rs)
continue;
data = buffer + hdrlen;
dump_qmi_msg(data, rs - hdrlen);
}
}
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