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client.c
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client.c
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/******************************************************************************
*
* FILENAME:
* client.c
*
* DESCRIPTION:
* A client to transmit file via datagram socket(UDP).
*
* REVISION(MM/DD/YYYY):
* 05/06/2015 Shengkui Leng (lengshengkui@outlook.com)
* - Initial version
*
******************************************************************************/
#include <unistd.h>
#include <libgen.h>
#include "dsc.h"
#define MAX_RETRY_TIMES 3
/******************************************************************************
* NAME:
* print_usage
*
* DESCRIPTION:
* Print usage information and exit the program.
*
* PARAMETERS:
* pname - The name of the program.
*
* RETURN:
* None
******************************************************************************/
void print_usage(char *pname)
{
printf("\n"
"===================================================\n"
" Client to transmit file via datagram socket \n"
" v%d.%d \n"
"===================================================\n"
"\n"
"Usage: %s [-s server_ip] [-p port_number] <filename>\n"
"\n"
"Options:\n"
" -s server_ip The IP address of server, default: %s\n"
" -p port_number The port number of server, default: %d\n"
" filename The file to transmit\n"
"\n"
"Example:\n"
" %s -s 192.168.1.100 -p 9000 test1.txt\n"
"\n",
VERSION_MAJOR, VERSION_MINOR,
pname, SERVER_IP, SERVER_PORT,
pname
);
exit(STATUS_ERROR);
}
int main(int argc, char *argv[])
{
dsc_client_t *clnt;
dsc_command_t *res;
char *fname = NULL;
char *pname = argv[0];
const char *server_ip = SERVER_IP;
int serv_port = SERVER_PORT;
int opt;
int rc = STATUS_SUCCESS;
int retry_count;
uint32_t sequence_no = 0;
while ((opt = getopt(argc, argv, ":hp:s:")) != -1) {
switch (opt) {
case 'p':
serv_port = strtol(optarg, NULL, 10);
if (serv_port <= 0) {
printf("Error: invalid port number!\n");
print_usage(pname);
}
break;
case 's':
server_ip = optarg;
break;
case 'h':
print_usage(pname);
break;
case ':':
printf("Error: option '-%c' needs a value\n", optopt);
print_usage(pname);
break;
case '?':
default:
printf("Error: invalid option '-%c'\n", optopt);
print_usage(pname);
break;
}
}
if ((optind+1) == argc) {
fname = argv[optind];
} else {
print_usage(pname);
}
FILE *fp = fopen(fname, "r");
if (NULL == fp) {
perror("Open file error");
return STATUS_OPEN_FILE_ERROR;
}
printf("Connect server %s:%d\n", server_ip, serv_port);
clnt = client_init(server_ip, serv_port);
if (clnt == NULL) {
printf("Error: client init error\n");
fclose(fp);
return STATUS_INIT_ERROR;
}
dsc_request_start_t req_st;
req_st.common.command = CMD_START;
req_st.common.seq_no = sequence_no;
req_st.common.data_len = strlen(basename(fname));
snprintf(req_st.filename, DSC_FILENAME_LEN-1, "%s", basename(fname));
req_st.filename[DSC_FILENAME_LEN-1] = 0;
printf("Start file transmition(send filename to server)...\n");
retry_count = MAX_RETRY_TIMES;
while (retry_count-- > 0) {
res = client_send_request(clnt, (dsc_command_t *)&req_st);
if (res == NULL) {
printf("Error: client send request error\n");
rc = STATUS_ERROR;
continue;
}
rc = res->status;
free(res);
if (rc != STATUS_SUCCESS) {
printf("CMD_START error(%d)\n", rc);
continue;
} else {
/* CMD_START OK */
break;
}
}
if (rc != STATUS_SUCCESS) {
printf("Fail to transmit file name\n");
fclose(fp);
client_close(clnt);
return rc;
}
sequence_no++;
int trans_end = 0;
do {
dsc_request_send_data_t req_dt;
int len = fread(req_dt.data, 1, DSC_DATA_SIZE-1, fp);
if (len < 0) {
perror("read file error");
rc = STATUS_READ_FILE_ERROR;
break;
} else if (len == 0) {
/* The end of file, set the trans_end flag and send a packet with
* data_len set to 0 to inform server, the file has been
* transmitted successfully.
*/
trans_end = 1;
printf("End of file transmition\n");
}
req_dt.common.command = CMD_SEND_DATA;
req_dt.common.data_len = len;
req_dt.common.seq_no = sequence_no;
retry_count = MAX_RETRY_TIMES;
while (retry_count-- > 0) {
res = client_send_request(clnt, (dsc_command_t *)&req_dt);
if (res == NULL) {
printf("Error: send request error\n");
rc = STATUS_ERROR;
continue;
}
rc = res->status;
free(res);
if (rc != STATUS_SUCCESS) {
printf("CMD_SEND_DATA error(%d)\n", rc);
continue;
} else {
/* CMD_SEND_DATA OK */
break;
}
}
sequence_no++;
} while (!trans_end);
fclose(fp);
client_close(clnt);
return rc;
}