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/*
* (C) 2013-2020 by Christian Hesse <mail@eworm.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*/
#include "config.h"
#include "version.h"
#include "cqrlogo.h"
/*** main ***/
int main(int argc, char **argv) {
const char * http_referer, * server_name, * uri;
char * uri_server_name, * pattern, * stolen;
regex_t preg;
regmatch_t pmatch[1];
uint8_t https;
struct timeval tv;
struct cqr_png * png;
struct cqr_bitmap * bitmap;
struct cqr_conf conf;
#if HAVE_FCGI
/* loop for requests */
while (FCGI_Accept() >= 0)
#endif
{
/* do the variable initialization within the loop! */
uri_server_name = NULL;
pattern = NULL;
stolen = NULL;
https = 0;
/* these default values are defined in config.h */
conf.scale = QRCODE_SCALE;
conf.border = QRCODE_BORDER;
conf.level = QRCODE_LEVEL;
conf.overwrite = ALLOW_OVERWRITE;
/* check if we have environment variables from CGI */
if ((server_name = getenv("SERVER_NAME")) == NULL) {
fprintf(stderr, "This is a CGI executable. Running without a web service is not supported.\n"
"Note that SERVER_NAME needs to be defined, for full features the client has\n"
"to send referer information.\n");
return EXIT_FAILURE;
}
/* check if we have https connection */
if (getenv("HTTPS") != NULL)
https = 1;
/* assemble uri for use when referer is missing or fails */
uri_server_name = malloc(10 + strlen(server_name));
sprintf(uri_server_name, "http%s://%s/", https ? "s" : "", server_name);
/* get http referer */
if ((http_referer = getenv("HTTP_REFERER")) != NULL) {
uri = http_referer;
/* prepare pattern matching */
pattern = malloc(sizeof(URLPATTERN) + strlen(server_name));
sprintf(pattern, URLPATTERN, server_name);
if (regcomp(&preg, pattern, 0) != 0) {
fprintf(stderr, "regcomp() failed, returning nonzero.\n");
return EXIT_FAILURE;
}
/* check if the QR-Code is for the correct server */
if (regexec(&preg, http_referer, 1, pmatch, 0) != 0) {
stolen = malloc(sizeof(TEXTSTOLEN) + strlen(server_name));
sprintf(stolen, TEXTSTOLEN, https ? "s" : "", server_name);
uri = stolen;
}
regfree(&preg);
free(pattern);
} else {
/* use uri assembled from server name */
uri = uri_server_name;
}
cqr_conf_file(server_name, &conf);
cqr_conf_string(getenv("QUERY_STRING"), &conf);
/* encode the QR-Code */
if ((bitmap = cqr_encode_qrcode_to_bitmap(uri, conf)) == NULL) {
/* uri too long? retry with uri from server name */
uri = uri_server_name;
if ((bitmap = cqr_encode_qrcode_to_bitmap(uri, conf)) == NULL) {
fprintf(stderr, "Could not generate QR-Code.\n");
return EXIT_FAILURE;
}
}
/* generate PNG data */
if ((png = cqr_bitmap_to_png(bitmap, uri, CQR_META_ALL)) == NULL) {
fprintf(stderr, "Failed to generate PNG.\n");
return EXIT_FAILURE;
}
/* print HTTP header */
fputs(CQR_HEADER_CONTENT_TYPE, stdout);
fputs(CQR_HEADER_CONTENT_DISPOSITION, stdout);
fputs(CQR_HEADER_CACHE_CONTROL, stdout);
fputs(CQR_HEADER_PRAGMA, stdout);
gettimeofday(&tv, NULL);
fprintf(stdout, "ETag: %lu%lu\n", tv.tv_sec, tv.tv_usec);
fputc('\n', stdout);
/* write PNG data to stdout */
if (fwrite(png->buffer, png->size, 1, stdout) != 1) {
fprintf(stderr, "Failed writing PNG data to stdout.\n");
return EXIT_FAILURE;
}
/* free memory we no longer need */
if (uri_server_name)
free(uri_server_name);
if (stolen)
free(stolen);
cqr_bitmap_free(bitmap);
if (png->size > 0)
free(png->buffer);
free(png);
}
return EXIT_SUCCESS;
}
// vim: set syntax=c:
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