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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include <sys/socket.h>
#include "http.h"
#include "memory.h"
#include "util.h"
static void free_list(char **list,int nitems){
for(int i=0;i<nitems;i++){
free(list[i]);
}
free(list);
}
// -2: error; -1: socket closed; >=0: length of string
static int sock_get_line(char **dst,int sock){
int linesz=128,linelen=0;
char *line=malloc(linesz,char);
bool haveCR=false,alsoCR=false;
while(true){
char c;
ssize_t ret=recv(sock,&c,1,0);
if(ret<=0){
free(line);
*dst=NULL;
return ret-1;
}
if(c=='\r'){
haveCR=true;
continue;
} else if(c=='\n'){
break;
} else if(haveCR){
haveCR=false;
alsoCR=true;
}
if(linelen+1+alsoCR==linesz){
linesz*=2;
if(linesz==0){
exit(255); // Integer overflow!
}
line=realloc(line,linesz,char);
}
if(alsoCR){
line[linelen++]='\r';
alsoCR=false;
}
line[linelen++]=c;
}
line[linelen]='\0';
*dst=line;
return linelen;
}
// Returns number of lines, or -1 if error
static int get_header_lines(char ***dst,int sock){
int arrsz=16,arrlen=0;
char **arr=malloc(arrsz,char*);
while(true){
char *line;
int linelen=sock_get_line(&line,sock);
if(linelen<0){
free_list(arr,arrlen);
*dst=NULL;
return -1;
}
if(linelen==0){
break;
}
if(arrlen+1==arrsz){
arrsz*=2;
if(arrsz==0){
exit(255); // Integer overflow!
}
arr=realloc(arr,arrsz,char*);
}
arr[arrlen++]=line;
}
arr[arrlen]=NULL;
*dst=arr;
return arrlen;
}
static Headers* alloc_headers(void){
Headers *headers=malloc(1,Headers);
headers->method=NULL;
headers->url=NULL;
headers->version=NULL;
headers->nheaders=0;
headers->headers=NULL;
return headers;
}
void free_headers(Headers *headers){
if(headers==NULL){
return;
}
if(headers->method)free(headers->method);
if(headers->url)free(headers->url);
if(headers->version)free(headers->version);
if(headers->headers){
for(int i=0;i<headers->nheaders;i++){
free(headers->headers[i][0]);
free(headers->headers[i][1]);
}
free(headers->headers);
}
free(headers);
}
Headers* http_get_headers(int sock){
char **lines;
int nlines=get_header_lines(&lines,sock);
if(nlines<0){
return NULL;
}
if(nlines==0){
free_list(lines,nlines);
return NULL;
}
char *spacep=strchr(lines[0],' ');
char *space2p=strrchr(lines[0],' ');
if(spacep==NULL||space2p==NULL){
free_list(lines,nlines);
return NULL;
}
char *urlstart=spacep+1;
while(isspace(*urlstart)){
urlstart++;
}
if(urlstart>space2p){ // No url?
free_list(lines,nlines);
return NULL;
}
Headers *headers=alloc_headers();
headers->method=copy_buf(lines[0],spacep-lines[0]);
str_toupper(headers->method);
headers->url=copy_buf(urlstart,space2p-urlstart);
headers->version=copy_str(space2p);
str_toupper(headers->version);
int hsz=16;
headers->nheaders=0;
headers->headers=malloc(hsz,Header);
for(int i=1;i<nlines;i++){
char *colonp=strchr(lines[i],':');
if(colonp==NULL){
free_list(lines,nlines);
free_headers(headers);
return NULL;
}
char *valuep=colonp+1;
while(isspace(*valuep)){
valuep++;
}
if(headers->nheaders+1==hsz){
hsz*=2;
// Don't need to check overflow, because nlines would have
// overflowed already
headers->headers=realloc(headers->headers,hsz,Header);
}
headers->headers[headers->nheaders][0]=copy_buf(lines[i],colonp-lines[i]);
headers->headers[headers->nheaders][1]=copy_str(valuep);
headers->nheaders++;
}
headers->headers[headers->nheaders][0]=NULL;
headers->headers[headers->nheaders][1]=NULL;
free_list(lines,nlines);
return headers;
}
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