Hello, I am trying to send a file (1 MB) through sockets and for some reason I am getting segmentation fault message and receiving in the server an incomplete file. The current file is about 3 pages long and need to send it from the client to the server. I've tried malloc with free(), I am now trying the read stream and write stream, with the fdopen and the flush at the end. I'm new with Linux and didnt know where to place my question.
I guess my question(s) are: how can I send the complete file to the server? Is there another function in c that I can use?
The global variables are declared elsewhere.
Thank you
Here is the code:
#include "sockheaders.h"
void bail(const char *on_what) {
if ( errno != 0 ) {
fputs(strerror(errno),stderr);
fputs(": ",stderr);
}
fputs(on_what,stderr);
fputc('\n',stderr);
exit(1);
}
int create_server_socket(char srvr_addr, char srvr_port){
/ srvr_addr = NULL;
srvr_port = "9099";
srvr_addr = "127.0.0.1";/
/*Create a TDP/IP socket to use : */
s = socket\(PF\_INET,SOCK_STREAM,0\);
if \( s == -1 \)\{ bail\("socket\(\)"\);\}
/* Create a server socket address: */
memset\(&adr_srvr,0,sizeof adr_srvr\);
adr\_srvr.sin_family = AF_INET;
adr\_srvr.sin_port = htons\(atoi\(srvr_port\)\);
if \( strcmp\(srvr_addr,"*"\) != 0 \) \{
/* Normal Address */
adr\_srvr.sin\_addr.s_addr = inet\_addr\(srvr_addr\);
if \( adr\_srvr.sin\_addr.s_addr == INADDR_NONE \)
bail\("bad address."\); \}
else \{ adr\_srvr.sin\_addr.s_addr = INADDR_ANY;\} /* Wild Address */
/*Bind the server address: */
len_inet = sizeof adr_srvr;
z = bind\(s,\(struct sockaddr *\)&adr\_srvr,len_inet\);
if \( z == -1 \) \{ bail\("bind\(2\)"\);\}
/* Make it a listening socket: */
z = listen\(s,10\);
if \( z == -1 \) \{ bail\("listen\(2\)"\);\}
//FILE *rx; /* read stream */
//FILE *tx; /* write stream */
//s = socket\(PF\_INET,SOCK_STREAM,0\);
srx = fdopen\(s,"r"\);
if \( srx == NULL \) \{
fprintf\(stderr, "%s: fdopen\(s,'r'\)\\n",strerror\(errno\)\);
exit\(1\);
\}
stx = fdopen\(dup\(s\),"w"\);
if \( stx == NULL \) \{
fprintf\(stderr,"%s: fdopen\(s,'w'\)\\n",strerror\(errno\)\);
exit\(1\);
\}
setlinebuf\(srx\); /* Line Buffered Mode */
setlinebuf\(stx\); /* Line Buffered Mode */
return 1;
}
send_server_message(){
strcpy\(dtbuf,"<html><bold> I am the server!</bold></html>"\);
/*##################################################################/
/-----------------connection section-------------------------------/
/*##################################################################/
/* Wait for a connect : */
len_inet = sizeof adr_clnt;
c = accept\(s,\(struct sockaddr *\)&adr\_clnt,&len_inet\);
if \( c == -1 \)\{ printf\("problem with accept\\n"\);\}
/--------- recieve message----------/
recieved[0]=0;
z = read(c,&recieved,sizeof recieved -1);
if ( z == -1 ){ printf("cannot read from socket 001\0");}
printf("int is: %s\n",recieved);
/---------Write result back to the client---------/
printf\(" sending the following %s\\n",dtbuf\);
z = write\(c,&dtbuf,sizeof dtbuf\);//changed by coe
if \( z == -1 \)\{ printf\("unable to write to socket"\);\}
/*CLOSE CLIENT CONNECTION*/
close\(c\);
return 1;
}
int create_client( char srvr_addr1, char srvr_port1){
/*##########################################################/
/*--------------connection1-setup---------------------------/
/*##########################################################*/
/*srvr_addr1 = NULL;
srvr_port1 = "9099";
srvr_addr1 = "127.0.0.1"; /
s1 = socket(PF_INET,SOCK_STREAM,0);
if ( s1 == -1 ){/*bail("socket()");/}
/*Create a server socket address: */
memset\(&adr_srvr1,0,sizeof adr_srvr1\);
adr\_srvr1.sin_family = AF_INET;
adr\_srvr1.sin_port = htons\(atoi\(srvr_port1\)\);
adr\_srvr1.sin\_addr.s_addr = inet\_addr\(srvr_addr1\);
if \( adr\_srvr1.sin\_addr.s_addr == INADDR_NONE \)\{/*bail\("bad address."\);*/\}
/*Connect to the server: */
len_inet1 = sizeof adr_srvr1;
/create the connection/
z1 = connect(s1,&adr_srvr1,len_inet1);
if ( z1 == -1 ){ /*bail("connect(2)");*/}
//FILE rx; / read stream */
//FILE tx; / write stream */
//s = socket(PF_INET,SOCK_STREAM,0);
crx = fdopen\(s1,"r"\);
if \( crx == NULL \) \{
fprintf\(stderr, "%s: fdopen\(s,'r'\)\\n",strerror\(errno\)\);
exit\(1\);
\}
ctx = fdopen\(dup\(s1\),"w"\);
if \( ctx == NULL \) \{
fprintf\(stderr,"%s: fdopen\(s,'w'\)\\n",strerror\(errno\)\);
exit\(1\);
\}
setlinebuf\(crx\); /* Line Buffered Mode */
setlinebuf\(ctx\); /* Line Buffered Mode */
return 1;
}
int send_message(){
/*##########################################################/
/*--------------connection1-message-------------------------/
/*##########################################################*/
strcpy(dtbuf,"I am the client!");
printf("sending: %s\n",dtbuf);
z1= send\_File\_To_Server\(\);
if \( z1 == -1 \)\{ /\*bail\("write\(2\)"\);*/\}
z1= read\(s1,&dtbuf,sizeof dtbuf -1\);
printf\("data recieved is %s",dtbuf\);
close\(s1\);
putchar\('\\n'\);
}
int send_File_To_Server(){
FILE *ptr;
ptr = fopen("config.c", "r"); //open file
crx = fdopen(c, "r");
if (!crx){
close(c);
//continue;
}
ctx = fdopen(dup(c), "w");
if (!ctx){
close(c);
//continue;
}
srx = fdopen(s1, "r");
if (!srx){
close(s1);
//continue;
}
stx = fdopen(dup(s1), "w");
if (!stx){
close(s1);
//continue;
}
setlinebuf(srx); /* Line Buffered Mode /
setlinebuf(stx); / Line Buffered Mode */
int ch;
int Pos,Length;
Pos = ftell(ptr);
fseek(ptr, 0L, SEEK_END);
Length = ftell(ptr);
fseek(ptr,Pos, SEEK_SET);
char temp[1048576];
int i=0;
while ((ch = getc(ptr)) != EOF/*!feof(ptr)*/){
temp[i]=ch;
i++;
} //prints everything from the file into the console
fputs(temp, stx);//to the server
fflush(stx);
}