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httpget.cpp
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446 lines (402 loc) · 9.32 KB
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/*
** JNetLib
** Copyright (C) 2008 Cockos Inc
** Copyright (C) 2000-2001 Nullsoft, Inc.
** Author: Justin Frankel
** File: httpget.cpp - JNL HTTP GET implementation
** License: see jnetlib.h
*/
#include "netinc.h"
#include "util.h"
#include "httpget.h"
JNL_HTTPGet::JNL_HTTPGet(JNL_IAsyncDNS *dns, int recvbufsize, char *proxy)
{
m_recvbufsize=recvbufsize;
m_dns=dns;
m_con=NULL;
m_http_proxylpinfo=0;
m_http_proxyhost=0;
m_http_proxyport=0;
if (proxy && *proxy)
{
char *p=(char*)malloc(strlen(proxy)+1);
if (p)
{
char *r=NULL;
strcpy(p,proxy);
do_parse_url(p,&m_http_proxyhost,&m_http_proxyport,&r,&m_http_proxylpinfo);
free(r);
free(p);
}
}
m_sendheaders=NULL;
reinit();
}
void JNL_HTTPGet::reinit()
{
m_errstr=0;
m_recvheaders=NULL;
m_recvheaders_size=0;
m_http_state=0;
m_http_port=0;
m_http_url=0;
m_reply=0;
m_http_host=m_http_lpinfo=m_http_request=NULL;
}
void JNL_HTTPGet::deinit()
{
delete m_con; m_con = NULL;
free(m_recvheaders);
free(m_http_url);
free(m_http_host);
free(m_http_lpinfo);
free(m_http_request);
free(m_errstr);
free(m_reply);
reinit();
}
JNL_HTTPGet::~JNL_HTTPGet()
{
deinit();
free(m_sendheaders);
free(m_http_proxylpinfo);
free(m_http_proxyhost);
}
void JNL_HTTPGet::addheader(const char *header)
{
if (strstr(header,"\r") || strstr(header,"\n")) return;
if (!m_sendheaders)
{
m_sendheaders=(char*)malloc(strlen(header)+3);
if (m_sendheaders)
{
strcpy(m_sendheaders,header);
strcat(m_sendheaders,"\r\n");
}
}
else
{
char *t=(char*)malloc(strlen(header)+strlen(m_sendheaders)+1+2);
if (t)
{
strcpy(t,m_sendheaders);
strcat(t,header);
strcat(t,"\r\n");
free(m_sendheaders);
m_sendheaders=t;
}
}
}
void JNL_HTTPGet::do_encode_mimestr(char *in, char *out)
{
char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int shift = 0;
int accum = 0;
while (*in)
{
if (*in)
{
accum <<= 8;
shift += 8;
accum |= *in++;
}
while ( shift >= 6 )
{
shift -= 6;
*out++ = alphabet[(accum >> shift) & 0x3F];
}
}
if (shift == 4)
{
*out++ = alphabet[(accum & 0xF)<<2];
*out++='=';
}
else if (shift == 2)
{
*out++ = alphabet[(accum & 0x3)<<4];
*out++='=';
*out++='=';
}
*out++=0;
}
void JNL_HTTPGet::connect(const char *url, int ver, const char *requestmethod)
{
deinit();
m_http_url=(char*)malloc(strlen(url)+1);
strcpy(m_http_url,url);
do_parse_url(m_http_url,&m_http_host,&m_http_port,&m_http_request, &m_http_lpinfo);
strcpy(m_http_url,url);
if (!m_http_host || !m_http_host[0] || !m_http_port)
{
m_http_state=-1;
seterrstr("invalid URL");
return;
}
size_t sendbufferlen=0;
if (!m_http_proxyhost || !m_http_proxyhost[0])
{
sendbufferlen += strlen(requestmethod)+1 /* GET */ + strlen(m_http_request) + 9 /* HTTP/1.0 */ + 2;
}
else
{
sendbufferlen += strlen(requestmethod)+1 /* GET */ + strlen(m_http_url) + 9 /* HTTP/1.0 */ + 2;
if (m_http_proxylpinfo&&m_http_proxylpinfo[0])
{
sendbufferlen+=58+strlen(m_http_proxylpinfo)*2; // being safe here
}
}
sendbufferlen += 5 /* Host: */ + strlen(m_http_host) + 2;
if (m_http_lpinfo&&m_http_lpinfo[0])
{
sendbufferlen+=46+strlen(m_http_lpinfo)*2; // being safe here
}
if (m_sendheaders) sendbufferlen+=strlen(m_sendheaders);
char *str=(char*)malloc(sendbufferlen+1024);
if (!str)
{
seterrstr("error allocating memory");
m_http_state=-1;
}
if (!m_http_proxyhost || !m_http_proxyhost[0])
{
sprintf(str,"%s %s HTTP/1.%d\r\n",requestmethod,m_http_request,ver%10);
}
else
{
sprintf(str,"%s %s HTTP/1.%d\r\n",requestmethod, m_http_url,ver%10);
}
sprintf(str+strlen(str),"Host:%s\r\n",m_http_host);
if (m_http_lpinfo&&m_http_lpinfo[0])
{
strcat(str,"Authorization: Basic ");
do_encode_mimestr(m_http_lpinfo,str+strlen(str));
strcat(str,"\r\n");
}
if (m_http_proxylpinfo&&m_http_proxylpinfo[0])
{
strcat(str,"Proxy-Authorization: Basic ");
do_encode_mimestr(m_http_proxylpinfo,str+strlen(str));
strcat(str,"\r\n");
}
if (m_sendheaders) strcat(str,m_sendheaders);
strcat(str,"\r\n");
int a=m_recvbufsize;
if (a < 4096) a=4096;
m_con=new JNL_Connection(m_dns,(int)strlen(str)+4,a);
if (m_con)
{
if (!m_http_proxyhost || !m_http_proxyhost[0])
{
m_con->connect(m_http_host,m_http_port);
}
else
{
m_con->connect(m_http_proxyhost,m_http_proxyport);
}
m_con->send_string(str);
}
else
{
m_http_state=-1;
seterrstr("could not create connection object");
}
free(str);
}
void JNL_HTTPGet::do_parse_url(char *url, char **host, int *port, char **req, char **lp)
{
char *p,*np;
free(*host); *host=0;
free(*req); *req=0;
free(*lp); *lp=0;
if (strstr(url,"://")) np=p=strstr(url,"://")+3;
else np=p=url;
while (*np != '/' && *np) np++;
if (*np)
{
*req=(char*)malloc(strlen(np)+1);
if (*req) strcpy(*req,np);
*np++=0;
}
else
{
*req=(char*)malloc(2);
if (*req) strcpy(*req,"/");
}
np=p;
while (*np != '@' && *np) np++;
if (*np)
{
*np++=0;
*lp=(char*)malloc(strlen(p)+1);
if (*lp) strcpy(*lp,p);
p=np;
}
else
{
*lp=(char*)malloc(1);
if (*lp) strcpy(*lp,"");
}
np=p;
while (*np != ':' && *np) np++;
if (*np)
{
*np++=0;
*port=atoi(np);
} else *port=80;
*host=(char*)malloc(strlen(p)+1);
if (*host) strcpy(*host,p);
}
const char *JNL_HTTPGet::getallheaders()
{ // double null terminated, null delimited list
if (m_recvheaders) return m_recvheaders;
else return "\0\0";
}
const char *JNL_HTTPGet::getheader(const char *headername)
{
if (!headername || !m_recvheaders) return NULL;
size_t headername_len = strlen(headername);
if (headername_len<1) return NULL;
if (headername[headername_len - 1] == ':') headername_len--;
const char *p=m_recvheaders;
while (*p)
{
if (!strnicmp(headername,p,headername_len) && p[headername_len] == ':')
{
p += headername_len + 1;
while (*p == ' ') p++;
return p;
}
p+=strlen(p)+1;
}
return NULL;
}
int JNL_HTTPGet::run()
{
int cnt=0;
if (m_http_state==-1||!m_con) return -1; // error
run_again:
m_con->run();
if (m_con->get_state()==JNL_Connection::STATE_ERROR)
{
seterrstr(m_con->get_errstr());
return -1;
}
if (m_con->get_state()==JNL_Connection::STATE_CLOSED) return 1;
if (m_http_state==0) // connected, waiting for reply
{
if (m_con->recv_lines_available()>0)
{
char buf[4096];
m_con->recv_line(buf,4095);
buf[4095]=0;
m_reply=(char*)malloc(strlen(buf)+1);
strcpy(m_reply,buf);
int code=getreplycode();
if (code == 200 || code==206) m_http_state=2; // proceed to read headers normally
else if (code == 301 || code==302)
{
m_http_state=1; // redirect city
}
else
{
seterrstr(buf);
m_http_state=-1;
return -1;
}
cnt=0;
}
else if (!cnt++) goto run_again;
}
if (m_http_state == 1) // redirect
{
while (m_con->recv_lines_available() > 0)
{
char buf[4096];
m_con->recv_line(buf,4096);
if (!buf[0])
{
m_http_state=-1;
return -1;
}
if (!strnicmp(buf,"Location:",9))
{
const char *p=buf+9; while (*p== ' ') p++;
if (*p)
{
connect(p);
return 0;
}
}
}
}
if (m_http_state==2)
{
if (!cnt++ && m_con->recv_lines_available() < 1) goto run_again;
while (m_con->recv_lines_available() > 0)
{
char buf[4096];
m_con->recv_line(buf,4096);
if (!buf[0]) { m_http_state=3; break; }
if (!m_recvheaders)
{
m_recvheaders_size=(int)strlen(buf)+1;
m_recvheaders=(char*)malloc(m_recvheaders_size+1);
if (m_recvheaders)
{
strcpy(m_recvheaders,buf);
m_recvheaders[m_recvheaders_size]=0;
}
}
else
{
int oldsize=m_recvheaders_size;
m_recvheaders_size+=(int)strlen(buf)+1;
char *n=(char*)malloc(m_recvheaders_size+1);
if (n)
{
memcpy(n,m_recvheaders,oldsize);
strcpy(n+oldsize,buf);
n[m_recvheaders_size]=0;
free(m_recvheaders);
m_recvheaders=n;
}
}
}
}
if (m_http_state==3)
{
}
return 0;
}
int JNL_HTTPGet::get_status() // returns 0 if connecting, 1 if reading headers,
// 2 if reading content, -1 if error.
{
if (m_http_state < 0) return -1;
if (m_http_state < 2) return 0;
if (m_http_state == 2) return 1;
if (m_http_state == 3) return 2;
return -1;
}
int JNL_HTTPGet::getreplycode()// returns 0 if none yet, otherwise returns http reply code.
{
if (!m_reply) return 0;
char *p=m_reply;
while (*p && *p != ' ') p++; // skip over HTTP/x.x
if (!*p) return 0;
return atoi(++p);
}
int JNL_HTTPGet::bytes_available()
{
if (m_con && m_http_state==3) return m_con->recv_bytes_available();
return 0;
}
int JNL_HTTPGet::get_bytes(char *buf, int len)
{
if (m_con && m_http_state==3) return m_con->recv_bytes(buf,len);
return 0;
}
int JNL_HTTPGet::peek_bytes(char *buf, int len)
{
if (m_con && m_http_state==3) return m_con->peek_bytes(buf,len);
return 0;
}