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common.c
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#include "common.h"
int create_socket(int domain, int type, int protocol)
{
int sID = -1;
sID = socket(domain, type, protocol);
return(sID);
}
int make_bind(int sockID, short int family, unsigned short int port, char *host)
{
int ok = -1;
struct sockaddr_in sockInfo;
bzero(&sockInfo, sizeof(struct sockaddr_in));
sockInfo.sin_family = family;
sockInfo.sin_port = htons(port);
if(host == NULL)
{
sockInfo.sin_addr.s_addr = INADDR_ANY;
}
else
{
sockInfo.sin_addr = *(struct in_addr *)gethostbyname(host)->h_addr;
}
ok = bind(sockID, (struct sockaddr *) &sockInfo, sizeof(struct sockaddr_in));
return(ok);
}
//====================
void help(struct PARAMS *params)
{
printf("[-p] port \t -- port number\n");
printf("[-v] \t\t -- verbose mode (shows a log on screen)\n");
printf("[-h] \t\t -- shows the help\n");
if(params->sc == TRIVIAL)
{
printf("[-r|-w] \t --read or write\n");
printf("[-t] rexmt \t -- retrasmission time\n");
printf("[-H] host \t -- name of host server\n");
printf("[-f] file \t -- name of the file\n");
}
}
void param_parser(int argc, char *argv[], struct PARAMS *params)
{
int i = 0;
for(i = 0; i < argc; i++)
{
if(!strcmp("-p", argv[i]))
{
params->port = atoi(argv[++i]);
}
if(!strcmp("-v", argv[i]))
{
params->verbose = 1;
}
if(!strcmp("-h", argv[i]))
{
help(params);
exit(EXIT_SUCCESS);
}
if(params->sc == TRIVIAL)
{
if(!strcmp("-r", argv[i]))
{
params->read_write = RFC1350_OP_RRQ;
}
if(!strcmp("-w", argv[i]))
{
params->read_write = RFC1350_OP_WRQ;
}
if(!strcmp("-f", argv[i]))
{
strcpy(params->file, argv[++i]);
}
if(!strcmp("-H", argv[i]))
{
strcpy(params->host, argv[++i]);
}
if(!strcmp("-t", argv[i]))
{
params->rexmt = atoi(argv[++i]);
}
}
}
}
//====================
int rwq_serialize(tftp_rwq_hdr *rwq, char *buffer)
{
int i = 0;
bzero(buffer, MAX_BUFFER);
stshort(rwq->opcode, buffer);
int sz = sizeof(unsigned short int);
for(i = 0; rwq->filename[i] != '\0' && i < MAXPATH_STRLEN; i++, sz++)
{
*(buffer+sz) = rwq->filename[i];
}
for(i = 0; rwq->mode[i] != '\0' && i < MAXMODE_STRLEN; i++, sz++)
{
*(buffer+sz+1) = rwq->mode[i];
}
return(++sz);
}
void rwq_deserialize(tftp_rwq_hdr *rwq, char *buffer)
{
int i = 0;
bzero(rwq, sizeof(tftp_rwq_hdr));
rwq->opcode = ldshort(buffer);
for(i = 0, buffer += sizeof(unsigned short int); *buffer != '\0' && i < MAXPATH_STRLEN; i++, buffer++)
{
rwq->filename[i] = *buffer;
}
for(i = 0, buffer += 1; *buffer != '\0' && i < MAXMODE_STRLEN; i++, buffer++)
{
rwq->mode[i] = *buffer;
}
for(i = 0, buffer += 1; *buffer != '\0' && i < 8; i++, buffer++)
{
rwq->tout[i] = *buffer;
}
for(i = 0, buffer += 1; *buffer != '\0' && i < 4; i++, buffer++)
{
rwq->toutv[i] = *buffer;
}
}
int ack_serialize(tftp_ack_hdr *ack, char *buffer)
{
int sz = 0;
bzero(buffer, MAX_BUFFER);
stshort(ack->opcode, buffer + sz);
sz += SHORT_SIZE;
stshort(ack->num_block, buffer + sz);
sz += SHORT_SIZE;
return(sz);
}
void ack_deserialize(tftp_ack_hdr *ack, char *buffer)
{
int sz = 0;
bzero(ack, sizeof(tftp_ack_hdr));
ack->opcode = ldshort(buffer + sz);
sz += SHORT_SIZE;
ack->num_block = ldshort(buffer + sz);
sz += SHORT_SIZE;
}
int data_serialize(tftp_data_hdr *data, char *buffer, int dsz)
{
int sz = 0;
bzero(buffer, MAX_BUFFER);
stshort(data->opcode, buffer + sz);
sz += SHORT_SIZE;
stshort(data->num_block, buffer + sz);
sz += SHORT_SIZE;
int i = 0;
for(i = 0; i < dsz; i++, sz++)
{
*(buffer + sz) = data->data[i];
}
return(sz);
}
void data_deserialize(tftp_data_hdr *data, char *buffer, int dsz)
{
int sz = 0;
bzero(data, sizeof(tftp_data_hdr));
data->opcode = ldshort(buffer+sz);
sz += SHORT_SIZE;
data->num_block = ldshort(buffer+sz);
sz += SHORT_SIZE;
int i = 0;
for(i = 0; i < (dsz - SHORT_SIZE * 2); i++, sz++)
{
data->data[i] = *(buffer+sz);
}
}
int error_serialize(tftp_error_hdr *error, char *buffer)
{
int sz = 0;
bzero(buffer, MAX_BUFFER);
stshort(error->opcode, buffer + sz);
sz += SHORT_SIZE;
stshort(error->code, buffer + sz);
sz += SHORT_SIZE;
int i = 0;
for(i = 0; i < MAX_ERROR_STRLEN && error->message[i] != '\0'; i++, sz++)
{
*(buffer + sz) = error->message[i];
}
return(++sz);
}
void error_deserialize(tftp_error_hdr *error, char *buffer, int dsz)
{
int sz = 0;
bzero(error, sizeof(tftp_error_hdr));
error->opcode = ldshort(buffer + sz);
sz += SHORT_SIZE;
error->code = ldshort(buffer + sz);
sz += SHORT_SIZE;
int i = 0;
for(i = 0; i < (dsz - SHORT_SIZE * 2); i++, sz++)
{
error->message[i] = *(buffer + sz);
}
}
//================
int sendACKOpt(int sockID, struct sockaddr_in sockInfo, char *opt, int value)
{
int sz = 0;
char buffer[MAX_BUFFER];
char vchar[4];
bzero(buffer, MAX_BUFFER);
bzero(vchar, 4);
stshort(6, buffer + sz);
sz += SHORT_SIZE;
int i = 0;
for(i = 0; *(opt+i) != '\0'; sz++, i++)
{
*(buffer+sz+1) = *(opt+i);
}
sprintf(vchar, "%d", value);
for(i = 0; *(vchar+i) != '\0'; sz++, i++)
{
*(buffer+sz+1) = *(vchar+i);
}
return(++sz);
}
int sendACK(int sockID, struct sockaddr_in sockInfo, unsigned short int ack)
{
char buffer[MAX_BUFFER];
tftp_ack_hdr aCk;
bzero(buffer, MAX_BUFFER);
bzero(&aCk, sizeof(tftp_ack_hdr));
aCk.opcode = RFC1350_OP_ACK;
aCk.num_block = ack;
int sz = ack_serialize(&aCk, buffer);
int ok = sendto(sockID, (char *) buffer, sz, 0, (struct sockaddr *) &sockInfo, sizeof(struct sockaddr_in));
return(ok);
}
int sendInfo(int sockID, struct sockaddr_in sockInfo, char *buffer, int sz)
{
return(sendto(sockID, (char *) buffer, sz, 0, (struct sockaddr *) &sockInfo, sizeof(struct sockaddr_in)));
}
int sendError(int sockID, struct sockaddr_in sockInfo, unsigned short int opcode, unsigned short int errcode, char *errtext)
{
tftp_error_hdr error;
char buffer[MAX_BUFFER];
bzero(&error, sizeof(tftp_error_hdr));
bzero(buffer, MAX_BUFFER);
error.opcode = opcode;
error.code = errcode;
strncpy(error.message, errtext, MAX_ERROR_STRLEN);
int sz = error_serialize(&error, buffer);
return(sendInfo(sockID, sockInfo, buffer, sz));
}
//================
int timeout_option(tftp_rwq_hdr *rwq, struct PARAMS *params)
{
int ok = -1;
if(!strcmp(rwq->tout, "timeout") && atoi(rwq->toutv) > 0 && atoi(rwq->toutv) < 256)
{
ok = 1;
params->rexmt = atoi(rwq->toutv);
if(params->verbose)
{
printf("New timeout value: %d s\n", params->rexmt);
}
}
return(ok);
}
int select_func(int sockID, int time)
{
fd_set fds;
struct timeval t_retx;
bzero(&t_retx, sizeof(struct timeval));
FD_ZERO(&fds);
FD_SET(sockID, &fds);
t_retx.tv_sec = time;
int s = select(sockID + 1, &fds , NULL , NULL , &t_retx);
return(s);
}
int mode_transfer(char *modeFound, char *modeCorrect, struct PARAMS *params)
{
int ok = 1;
if(strcmp(modeFound, modeCorrect))
{
if(params->verbose)
{
printf("ERROR Client transfer mode is set to: %s\n", modeFound);
}
ok = -1;
}
return(ok);
}
FILE *open_file(char *fName, char *mode, struct PARAMS *params)
{
FILE *pFile = NULL;
if((pFile = fopen(fName, mode)) == NULL)
{
if(params->verbose)
{
printf("Error opening file: %s\n", fName);
}
}
return(pFile);
}
int file_exists(char *fName)
{
FILE *pFile = NULL;
int OK = -1;
if((pFile = fopen(fName, "r")) != NULL)
{
fclose(pFile);
OK = 1;
}
return(OK);
}
int get_data(tftp_data_hdr *data, int sockID, struct sockaddr_in sockInfo, struct PARAMS *params)
{
int sz = 0;
char buffer[MAX_BUFFER];
socklen_t socklen = sizeof(struct sockaddr_in);
bzero(buffer, MAX_BUFFER);
bzero(data, sizeof(tftp_data_hdr));
sz = recvfrom(sockID, (char *) buffer, MAX_BUFFER, 0, (struct sockaddr *) &sockInfo, &socklen);
data_deserialize(data, buffer, sz);
if(params->verbose)
{
printf("C\t %s: Data [%d#] [%lu]\n", inet_ntoa(sockInfo.sin_addr), data->num_block, sz - SHORT_SIZE * 2);
printf("S\t ACK [%d#]\n", data->num_block);
}
return(sz - SHORT_SIZE * 2);
}
int get_ack(tftp_ack_hdr *ack, int sockID, struct sockaddr_in sockInfo, struct PARAMS *params)
{
int sz = 0;
char buffer[MAX_BUFFER];
socklen_t socklen = sizeof(struct sockaddr_in);
bzero(buffer, MAX_BUFFER);
bzero(ack, sizeof(tftp_ack_hdr));
sz = recvfrom(sockID, (char *) buffer, MAX_BUFFER, 0, (struct sockaddr *) &sockInfo, &socklen);
ack_deserialize(ack, buffer);
if(params->verbose)
{
printf("S\t ACK [%d#]\n", ack->num_block);
}
return(sz);
}