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#ifndef URL_H
#define URL_H
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
//reserved = gen-delims / sub-delims
#define pe_gen_delims ":/?#[]@"
#define pe_sub_delims "!$&'()*+,;="
//char *pe_reserved[]=pe_gen_delims "" pe_sub_delims;
#define pe_ALPHA "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
#define pe_DIGIT "0123456789"
#define pe_HPUT "-._~"
//char *pe_unreserved[]=pe_ALPHA "" pe_DIGIT "" pe_HPUT;
unsigned char rfc3086_percent_encoding[256];
#define isxdigit(a) ((a >= 'a' && a <= 'f') || (a >= '0' && a <= '9') || (a >= 'A' && a <= 'F'))
#define toupper(a) ((a >= 'a' && a <= 'z')?a-' ':a)
char *reserved={
pe_gen_delims
pe_sub_delims
pe_ALPHA
pe_DIGIT
pe_HPUT
};
int urlescapelength(char *in,int len) {
int rlen=0;//be sure to add one to this return value if you plan on putting a null byte at the end.
int i;
for(i=0;i<len;i++) {
rlen+=strchr(reserved,in[i])?1:3;
}
return rlen;
}
// make sure your out char * has enough space! use urlescapelength for it.
void urlescape(char *in,char *out,int len) {
int i;
int j;
for(i=0,j=0;i<len;i++) {
if(strchr(reserved,in[i])) {
out[j]=in[i];
j++;
} else {
out[j]='%';
j++;
out[j]="0123456789ABCDEF"[(in[i] >> 4 & 0x15)];
j++;
out[j]="0123456789ABCDEF"[(in[i] % 16)];
j++;
}
}
}
int urlunescape(char *in,char *out) {
char *o=out;
char *t;
char a,b;
char *s=in;
if(!strchr(s,'%')) memmove(out,in,strlen(in));
while((t=strchr(s,'%'))) {
if(t-s) {//if there are actually bytes to copy.
memmove(o,s,t-s);
o+=(t-s);
s+=(t-s);
}
if(isxdigit(t[1]) && isxdigit(t[2])) {
s+=3;//skip the %XX
a=toupper(t[1]);
b=toupper(t[2]);
*o=((a-'0'<10 ? a-'0' : a-'A'+10) << 4) + (b-'0'<10 ? b-'0' : b-'A'+10);
o++;
} else {
s++;//skip just the %. the next character might be a % //TODO: look up what the "right" thing to do here is.
*o='%';
o++;
}
}
//copy the last part.
memmove(o,s,strlen(s));
o[strlen(s)]=0;
return o+strlen(s)-out;
}
struct url {
char *scheme;
char *username;
char *password;
char *domain;
char *port;
char *path;
char *query_string;
char *fragment_id;
};
/*
schemes are case sensitive but cononicals are lower case.
domain is case insensitive. return it lowercased?
port is optional and in decimal
path
scheme://username:password@domain:port/path?query_string#fragment_id
mailto:username@domain
optional stuff:
scheme, username, password, port, path, query_string, fragment_id
*/
void urlfromline(struct url *u,char *line) {
int i;
char hack=0;//we need to allow for // as host//path separator
//split at first single / into line and path
//this fails to split scheme://host//path into: scheme, host, /path. needs to be first single / or second double-or-more-/
for(i=0;line[i];i++) {
if(line[i] == '/' && line[i+1] == '/') {
if(!hack) {//only skip out on the first // because it is probably used in the scheme.
hack=1;
i++;
continue;
}
}
if(line[i] == '/') {
line[i]=0;
u->path=line+i+1;
break;
}
}
if(u->path) {
if(strchr(u->path,'?')) {
u->query_string=strchr(u->path,'?');
*u->query_string=0;
u->query_string++;
}
}
if(u->query_string) {
if(strchr(u->query_string,'#')) {
u->fragment_id=strchr(u->query_string,'#');
*u->fragment_id=0;
u->fragment_id++;
}
}
if(strstr(line,"://")) {
u->scheme=line;
u->domain=strstr(line,"://");
*u->domain=0;
u->domain+=3;
} else {
u->domain=line;
}
if(u->domain) {
if(strchr(u->domain,'@')) {
u->username=u->domain;
u->domain=strchr(u->domain,'@');
*u->domain=0;
u->domain++;
}
}
if(u->username) {
if(strchr(u->username,':')) {
u->password=strchr(u->username,':');
*u->password=0;
u->password++;
}
}
if(u->domain) {
if(strchr(u->domain,']')) {//the end of an IPv6 address
if(strchr(strchr(u->domain,']'),':')) {
u->port=strchr(strchr(u->domain,']'),':');
if(u->port[1] == '?') {//for magnet links
u->port=0;
} else {
*u->port=0;
u->port++;
}
}
} else {
if(strchr(u->domain,':')) {
u->port=strchr(u->domain,':');
if(u->port[1] == '?') {//for magnet links
u->port=0;
} else {
*u->port=0;
u->port++;
}
}
}
}
if(u->port) {
for(i=0;u->port[i];i++) {
if(u->port[i] < '0' || u->port[i] > '9') {
//this port number isn't a number!
//it is probably a different portion of the url then... and the domain is probably the scheme.
if(u->domain && !u->scheme) {
u->scheme=u->domain;
u->domain=0;
}
if(!u->path) {
u->path=u->port;
u->port=0;
}
break;
}
}
}
if(u->domain) {//for magnet links.
if(strchr(u->domain,'?')) {
u->query_string=strchr(u->domain,'?');
*u->query_string=0;
u->query_string++;
}
}
if(u->domain) {
if(strchr(u->domain,':') && !strchr(u->domain,']')) {//for scheme:?query_string
u->scheme=u->domain;
*strchr(u->scheme,':')=0;
u->domain=0;
}
}
if(!u->scheme && u->username) {//for mailto:
u->scheme=u->username;
u->username=u->password;
u->password=0;
}
}
#define AorB(a,b) ((a)?(a):(b))
void magic_and_defaults(struct url *u) {
struct servent *serv;
char sport[10];
u->scheme=AorB(u->scheme,AorB(getenv("URL_SCHEME"),"DEFAULT"));
u->username=AorB(u->username,AorB(getenv("URL_USERNAME"),"DEFAULT"));
u->password=AorB(u->password,AorB(getenv("URL_PASSWORD"),"DEFAULT"));
u->domain=AorB(u->domain,AorB(getenv("URL_DOMAIN"),"DEFAULT"));
serv=getservbyname(u->scheme,strcmp(u->scheme,"udp")?"tcp":"udp");//gets default port for the scheme. http -> 80
if(serv) snprintf(sport,sizeof(sport)-1,"%d",ntohs(serv->s_port));
// else snprintf(sport,sizeof(sport)-1,"%d",serv);
u->port=AorB(u->port,AorB(getenv("URL_PORT"),(serv?strdup(sport):"DEFAULT")));
// if(!strcmp(u->port,"DEFAULT")) {
//this shouldn't happen most of the time. :/
// printf("serv: %d\nsport: %s\nu->scheme: %s\n",serv,sport,u->scheme);
// }
u->path=AorB(u->path,AorB(getenv("URL_PATH"),"DEFAULT"));
u->query_string=AorB(u->query_string,AorB(getenv("URL_QUERY_STRING"),"DEFAULT"));
u->fragment_id=AorB(u->fragment_id,AorB(getenv("URL_FRAGMENT_ID"),"DEFAULT"));
}
#endif
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