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woozle.org
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Add l.cgi

This commit is contained in:
Neale Pickett 2012-11-27 13:30:06 -06:00
parent c947e9983c
commit 01cc421b04
2 changed files with 377 additions and 1 deletions
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376
l.cgi.c Normal file
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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <values.h>
#include <time.h>
#include <glob.h>
const char *BASE_DIR = "/tmp/clicko";
const char *BASE_URL = "http://woozle.org/l.cgi";
#define POST_MAX 1024
/*
* CGI
*/
static int is_cgi = 0;
static char **argv = NULL;
static int
read_char_argv()
{
static int arg = 0;
static char *p;
if (NULL == argv) {
return EOF;
}
if (0 == arg) {
arg = 1;
p = argv[1];
}
if (! p) {
return EOF;
} else if (! *p) {
arg += 1;
p = argv[arg];
return '&';
}
return *(p++);
}
static int
read_char_stdin()
{
static int inlen = -1;
if (-1 == inlen) {
char *p = getenv("CONTENT_LENGTH");
if (p) {
inlen = atoi(p);
if (inlen > POST_MAX) {
inlen = POST_MAX;
}
if (inlen < 0) {
inlen = 0;
}
} else {
inlen = 0;
}
}
if (inlen) {
inlen -= 1;
return getchar();
}
return EOF;
}
static int
read_char_query_string()
{
static char *p = (char *)-1;
if ((char *)-1 == p) {
p = getenv("QUERY_STRING");
}
if (! p) {
return EOF;
} else if (! *p) {
return EOF;
} else {
return *(p++);
}
}
static int (* read_char)() = read_char_argv;
int
cgi_init(char *global_argv[])
{
char *rm = getenv("REQUEST_METHOD");
if (! rm) {
read_char = read_char_argv;
argv = global_argv;
} else if (0 == strcmp(rm, "POST")) {
read_char = read_char_stdin;
is_cgi = 1;
} else if (0 == strcmp(rm, "GET")) {
read_char = read_char_query_string;
is_cgi = 1;
} else {
printf(("405 Method not allowed\r\n"
"Allow: GET, POST\r\n"
"Content-type: text/plain\r\n"
"\r\n"
"%s is not allowed.\n"),
rm);
return -1;
}
return 0;
}
static char
tonum(int c)
{
if ((c >= '0') && (c <= '9')) {
return c - '0';
}
if ((c >= 'a') && (c <= 'f')) {
return 10 + c - 'a';
}
if ((c >= 'A') && (c <= 'F')) {
return 10 + c - 'A';
}
return 0;
}
static char
read_hex()
{
int a = read_char();
int b = read_char();
return tonum(a)*16 + tonum(b);
}
/* Read a key or a value. Since & and = aren't supposed to appear
outside of boundaries, we can use the same function for both.
*/
size_t
cgi_item(char *str, size_t maxlen)
{
int c;
size_t pos = 0;
while (1) {
c = read_char();
switch (c) {
case EOF:
case '=':
case '&':
str[pos] = '\0';
return pos;
case '%':
c = read_hex();
break;
case '+':
c = ' ';
break;
}
if (pos < maxlen - 1) {
str[pos] = c;
pos += 1;
}
}
}
void
cgi_head(char *title)
{
if (is_cgi) {
printf("Content-type: text/html\r\n\r\n");
}
printf(("<!DOCTYPE html>\n"
"<html>\n"
" <head><title>%s</title></head>\n"
" <body>\n"
" <h1>%s</h1>\n"),
title, title);
}
void
cgi_foot()
{
printf("\n"
" </body>\n"
"</html>\n");
}
void
cgi_result(int code, char *desc, char *fmt, ...)
{
va_list ap;
if (is_cgi) {
printf("%d %s\r\n", code, desc);
}
cgi_head(desc);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
cgi_foot();
exit(0);
}
void
cgi_page(char *title, char *fmt, ...)
{
va_list ap;
cgi_head(title);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
cgi_foot();
exit(0);
}
void
cgi_error(char *text)
{
cgi_result(500, "Internal error", "<p>%s</p>", text);
}
static FILE *
open_file(char *shorty, char *mode)
{
char fn[256];
FILE *f;
snprintf(fn, sizeof fn, "%s/%s.url", BASE_DIR, shorty);
f = fopen(fn, mode);
if (! f) {
cgi_error("Unable to open database");
}
return f;
}
void
shorten_url()
{
char u[4096];
size_t ulen;
char shorty[16];
ulen = cgi_item(u, sizeof u);
if (ulen == 0) {
cgi_error("No URL specified");
}
snprintf(shorty, sizeof shorty, "%08x.%04x", (unsigned int)time(NULL), getpid());
/* Put the URL into a file */
{
FILE *f = open_file(shorty, "w");
fprintf(f, "%s", u);
fclose(f);
}
/* Report back */
printf("Content-type: text/plain\r\n\r\n");
printf("%s/%s\n", BASE_URL, shorty);
}
void
redirect(char *pi)
{
int i;
if (! pi) {
cgi_error("No short URL provided");
}
if (pi[0] != '/') {
cgi_error("Invalid PATH_INFO");
}
pi += 1;
for (i = 0; pi[i]; i += 1) {
if ((! isalnum(pi[i])) &&
(pi[i] != '.')) {
cgi_error("Bad short URL");
}
}
/* Open file */
{
char u[4096];
FILE *f = open_file(pi, "r");
fgets(u, sizeof u, f);
fclose(f);
printf("Location: %s\r\n", u);
}
}
void
list_links()
{
char g[256];
glob_t globbuf;
int i;
snprintf(g, sizeof g, "%s/*.url", BASE_DIR);
glob(g, 0, NULL, &globbuf);
cgi_head("Clicko history");
printf("<ul>\n");
for (i = globbuf.gl_pathc - 1; i >= 0; i -= 1) {
FILE *f = fopen(globbuf.gl_pathv[i], "r");
char url[4096];
fgets(url, sizeof url, f);
fclose(f);
printf("<li><a href=\"%s\">%s</a></li>\n", url, url);
}
printf("</ul>\n");
cgi_foot();
}
int
main(int argc, char *argv[])
{
if (-1 == cgi_init(argv)) {
fprintf(stderr, "Unable to initialize CGI.\n");
return -1;
}
while (1) {
char key[12];
size_t klen;
klen = cgi_item(key, sizeof key);
if (klen == 0) {
break;
}
switch (key[0]) {
case 'u':
shorten_url();
return 0;
}
}
{
char *pi = getenv("PATH_INFO");
if (pi) {
redirect(pi);
}
}
list_links();
return 0;
}

2
woozle.mk
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@ -1,6 +1,6 @@
PLAIN += . PLAIN += .
COPY += icon.png style.css style-black.css lists.cgi wishlist.cgi set.cgi $(TEMPLATE) COPY += icon.png style.css style-black.css lists.cgi wishlist.cgi set.cgi $(TEMPLATE)
COPY += mail.cgi ilohamail.cgi COPY += mail.cgi ilohamail.cgi l.cgi
COPY += google7f698b9893809122.html COPY += google7f698b9893809122.html
HTML += people.html HTML += people.html