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/*
* Reads gopher output from a TCP port, outputs
* html on standard output.
* Usage: gopher2html gopher-string
* where gopher-string is the string sent to
* the gopher server to get the document.
*
* Gopher protocol is described in rfc1436
*/
#include <u.h>
#include <libc.h>
char *cmd;
int ifd;
void errexit(char *s, ...){
static char buf[1024];
char *out;
va_list args;
va_start(args, s);
out = doprint(buf, buf+sizeof(buf), s, args);
va_end(args);
*out='\0';
print("<head><title>%s error</title></head>\n", cmd);
print("<body><h1>%s error</h1>\n", cmd);
print("%s</body>\n", buf);
exits("gopher error");
}
void wtext(char *buf, char *ebuf){
char *bp;
for(bp=buf;bp!=ebuf;bp++){
if(*bp=='<' || *bp=='>' || *bp=='&' || *bp=='"'){
if(bp!=buf) write(1, buf, bp-buf);
buf=bp+1;
switch(*bp){
case '<': print("<"); break;
case '>': print(">"); break;
case '&': print("&"); break;
case '"': print("""); break;
}
}
}
if(bp!=buf) write(1, buf, bp-buf);
}
void savefile(char *name, char *type){
int fd, n;
char save[30], buf[1024];
for(n=1;;n++){
if(n==100) errexit("can't save binary file %s: %r", name);
sprint(save, "gopher.save.%d", n);
fd=create(save, OWRITE, 0444);
if(fd!=-1) break;
}
print("<head><title>%s</title></head\n", name);
print("<body><h1>%s</h1><p>\n", name);
print("Saving %s file %s in <tt>%s</tt>...\n", type, name, save);
while((n=read(ifd, buf, sizeof buf))>0) write(fd, buf, n);
close(fd);
print("done</body>\n");
}
void copyfile(char *title){
char buf[1024];
int n;
print("<head><title>%s</title></head>\n", title);
print("<body><h1>%s</h1><pre>\n", title);
while((n=read(ifd, buf, sizeof buf))>0) wtext(buf, buf+n);
print("</pre></body>\n");
}
/*
* A directory entry contains
* type name selector host port
* all tab separated, except type and name (type is one character)
*/
char ibuf[1024], *ibp, *eibuf;
#define EOF (-1)
int get(void){
int n;
Again:
if(ibp==eibuf){
n=read(ifd, ibuf, sizeof(ibuf));
if(n<=0) return EOF;
eibuf=ibuf+n;
ibp=ibuf;
}
if(*ibp=='\r'){
ibp++;
goto Again;
}
return *ibp++&255;
}
char *escape(char *in){
static char out[516];
char *op, *eop;
eop=out+512;
op=out;
for(;*in;in++){
if(op<eop){
if(strchr("/$-_@.&!*'(),", *in)
|| 'a'<=*in && *in<='z'
|| 'A'<=*in && *in<='Z'
|| '0'<=*in && *in<='9')
*op++=*in;
else{
sprint(op, "%%%.2X", *in&255);
op+=3;
}
}
}
*op='\0';
return out;
}
void copydir(char *title){
int type, c;
char name[513], *ename;
char selector[513];
char host[513];
char port[513];
char *bp;
print("<head><title>%s</title></head>\n", title);
print("<body><h1>%s</h1><ul>\n", title);
for(;;){
type=get();
if(type==EOF || type=='.') break;
bp=name;
while((c=get())!=EOF && c!='\t') if(bp!=&name[512]) *bp++=c;
ename=bp;
bp=selector;
while((c=get())!=EOF && c!='\t') if(bp!=&selector[512]) *bp++=c;
*bp='\0';
bp=host;
while((c=get())!=EOF && c!='\t') if(bp!=&host[512]) *bp++=c;
*bp='\0';
bp=port;
while((c=get())!=EOF && c!='\t' && c!='\n') if(bp!=&port[512]) *bp++=c;
while(c!=EOF && c!='\n') c=get();
*bp='\0';
switch(type){
case '3':
print("<li>");
wtext(name, ename);
break;
case '7':
print("<li><isindex action=\"gopher://%s:%s/%c%s\">",
host, port, type, escape(selector));
wtext(name, ename);
break;
default:
print("<li><a href=\"gopher://%s:%s/%c%s\">",
host, port, type, escape(selector));
wtext(name, ename);
print("</a>\n");
break;
}
}
print("</ul></body>\n");
}
int hexdigit(int c){
if('0'<=c && c<='9') return c-'0';
if('a'<=c && c<='f') return c-'a'+10;
if('A'<=c && c<='F') return c-'A'+10;
return -1;
}
void unescape(char *s){
char *t;
int hi, lo;
t=s;
while(*s){
if(*s=='%'
&& (hi=hexdigit(s[1]))>=0
&& (lo=hexdigit(s[2]))>=0){
*t++=hi*16+lo;
s+=3;
}
else *t++=*s++;
}
*t='\0';
}
void main(int argc, char *argv[]){
char dialstr[1024];
char *name;
cmd=argv[0];
if(argc!=4) errexit("Usage: %s host port selector", argv[0]);
sprint(dialstr, "tcp!%s!%s", argv[1], argv[2]);
ifd=dial(dialstr, 0, 0, 0);
if(ifd==-1) errexit("can't call %s:%s", argv[1], argv[2]);
unescape(argv[3]);
switch(argv[3][0]){
case '/':
fprint(ifd, "\r\n");
copydir(argv[3]);
break;
case '\0':
fprint(ifd, "\r\n");
copydir(argv[1]);
break;
case '7': /* index query */
name=strchr(argv[3], '?');
if(name!=0){
if(name==argv[3]+1){
argv[3][1]=argv[3][0];
argv[3]++;
}
else
*name='\t';
name++;
}
else
name=argv[3];
fprint(ifd, "%s\r\n", argv[3]+1);
copydir(name);
break;
default:
fprint(ifd, "%s\r\n", argv[3]+1);
name=strrchr(argv[3], '/');
if(name==0) name=argv[3];
else name++;
switch(argv[3][0]){
default: errexit("sorry, can't handle %s (type %c)",
argv[3]+1, argv[3][0]);
case '0': copyfile(name); break;
case '1': copydir(name); break;
case '4': savefile(name, "Macintosh BINHEX"); break;
case '5': savefile(name, "DOS binary"); break;
case '6': savefile(name, "uuencoded"); break;
case '9': savefile(name, "binary"); break;
case 'g': savefile(name, "GIF"); break;
case 'I': savefile(name, "some sort of image"); break;
}
break;
}
exits(0);
}
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