char * sc_https2http (char * i) {
if (i && strlen(i) >= 4 && i[4] == 's')
memmove(i+4, i+5, strlen(i)-3);
return i;
}
char * sc_queryhtml (struct sc_query * q, const char * h, size_t l) { /* remember to free returned string in the caller */ /* caller takes care of freeing */
size_t resultshtml_written = 0;
size_t resultshtml_sizeof = SC_ALLOC_CHUNK;
char * resultshtml = malloc(resultshtml_sizeof);
resultshtml[0] = '\0';
for (size_t i = 0; i < q->results_length && (!l || i < l); i++) {
#define SC_HRC(string, wanted) \
if (string##_written+wanted >= string##_sizeof) { \
string##_sizeof = (string##_written+wanted+1)*SC_REALLOC_K; \
string = realloc(string, string##_sizeof); \
}
#define SC_HRF ""
#define SC_HIF "![](\"%s\")
"
#define SC_HRA i, safeurl ? h ? sc_https2http(safeurl) : safeurl : SC_I18N_NO_HREFLINK, i, safetitle ? safetitle : SC_I18N_NO_TITLE, \
safebreadcrumbs ? safebreadcrumbs : safeurl ? safeurl : SC_I18N_NO_HREFLINK, safebody ? safebody : SC_I18N_NO_DESCRIPTION
char * safetitle = htmlspecialchars(q->results[i]->title); /* htmlspecialchars returns NULL if input is null */
char * safebody = htmlspecialchars(q->results[i]->desc);
char * safeurl = htmlspecialchars(q->results[i]->url);
char * safebreadcrumbs = htmlspecialchars(q->results[i]->breadcrumbs);
size_t ws;
if (q->opt & SC_OPT_IMAGE) {
ws = snprintf(NULL, 0, SC_HIF, SC_HRA);
SC_HRC(resultshtml, ws);
resultshtml_written += sprintf(resultshtml+resultshtml_written, SC_HIF, SC_HRA);
} else {
ws = snprintf(NULL, 0, SC_HRF, SC_HRA);
SC_HRC(resultshtml, ws);
resultshtml_written += sprintf(resultshtml+resultshtml_written, SC_HRF, SC_HRA);
}
free(safebreadcrumbs);
free(safetitle);
free(safebody);
free(safeurl);
}
#define SC_HRS SC_I18N_NUMBER_OF_RESULTS ": %zu | " SC_I18N_QUERY_TIME ": %s"
char formatted_time[128];
struct tm tm;
localtime_r(&q->lookup_time, &tm);
strftime(formatted_time, 128, SC_I18N_DATETIME_FORMAT, &tm);
char queryinfo[256];
snprintf(queryinfo, 256, SC_HRS, q->results_length, formatted_time);
char * safequery = htmlspecialchars(q->string);
char * response = malloc(strlen((char *) sc_hp)+2*strlen(safequery)+strlen(queryinfo)+strlen(resultshtml)+strlen(""));
sprintf(response, (char *) sc_hp, safequery, safequery, h ? "" : "", queryinfo, resultshtml);
free(safequery);
free(resultshtml);
return response;
}
#ifdef SC_LOGMEM
char * sc_logshtml (struct sc_cache * c) { /* remember to free on caller, remember not to report errors here whilst locked */
char * html = malloc(SC_ALLOC_CHUNK);
html[0] = '\0';
size_t html_written = 0;
size_t html_sizeof = 0;
pthread_rwlock_rdlock(c->logentries_lock);
if (!c->logentries) {
free(html);
return NULL;
}
for (size_t i = 0; i < c->logentries_length; i++) {
#define SC_HLF ""
#define SC_HLA i, \
sc_log_str(c->logentries[i]->type), \
sc_log_str(c->logentries[i]->type), \
formatted_time, \
c->logentries[i]->file, \
c->logentries[i]->line, \
c->logentries[i]->function, /* compile-time burned in values are safe from xss :) */ \
c->logentries[i]->file, \
c->logentries[i]->line, \
safemessage /* ... whereas this might contain < */
struct tm tm;
char formatted_time[128];
localtime_r(&c->logentries[i]->time, &tm);
strftime(formatted_time, 128, SC_I18N_DATETIME_FORMAT, &tm);
char * safemessage = htmlspecialchars(c->logentries[i]->message);
size_t ws = snprintf(NULL, 0, SC_HLF, SC_HLA);
SC_HRC(html, ws);
html_written += sprintf(html+html_written, SC_HLF, SC_HLA);
free(safemessage);
}
pthread_rwlock_unlock(c->logentries_lock);
return html;
}
#endif
enum MHD_Result sc_httpd (void * cls,
struct MHD_Connection * connection,
const char * url,
const char * method,
const char * version,
const char * upload_data,
size_t * upload_data_size,
void ** ptr) {
struct sc_cache * c = (struct sc_cache *) cls;
static int dummy;
struct MHD_Response * httpd_response;
int ret;
if (0 != strcmp(method, "GET"))
return MHD_NO; /* unexpected method */
if (&dummy != *ptr) {
/* the first time only the headers are valid, do not respond in the first round ... */
*ptr = &dummy;
return MHD_YES;
}
if (0 != *upload_data_size)
return MHD_NO; /* upload data in a GET?! */
*ptr = NULL; /* clear context pointer */
char * response = NULL;
enum MHD_ResponseMemoryMode mhdrmm = MHD_RESPMEM_MUST_FREE;
const char * query = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "q");
const char * host = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Host");
char * location = "//git.sijanec.eu/sijanec/sear.c";
char * content_type = "text/html";
int status_code = MHD_HTTP_OK;
SC_OPT_TYPE opt = 0;
if (MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "i"))
opt |= SC_OPT_IMAGE;
if (!host)
host = "";
struct sc_query * q = NULL;
if (!query) {
if (url[0] == '/')
switch (url[1]) {
case 's': /* security.txt */
case '.': /* .well-known/security.txt */
mhdrmm = MHD_RESPMEM_PERSISTENT;
response = sc_securitytxt;
content_type = "text/plain";
break;
case 'r': /* robots.txt */
mhdrmm = MHD_RESPMEM_PERSISTENT;
response = sc_robotstxt;
content_type = "text/plain";
break;
case 'o': /* osdd.xml - opensearch description document */
response = malloc(strlen(sc_osdd)+strlen(host));
sprintf(response, sc_osdd, host);
content_type = "application/opensearchdescription+xml";
break;
#ifdef SC_LOGMEM
case 'l': /* logs.html */
{
char * logshtml = sc_logshtml(c);
response = malloc(strlen((char *) sc_hp)+strlen(SC_I18N_LOGS)+strlen(logshtml ? logshtml : SC_I18N_LOGS_ERROR));
sprintf(response, (char *) sc_hp, "", "", SC_I18N_LOGS, logshtml ? logshtml : SC_I18N_LOGS_ERROR);
free(logshtml);
}
break;
#endif
}
if (!response) {
response = malloc(strlen((char *) sc_hp)+strlen(SC_I18N_HP_HEADING)+strlen(SC_I18N_HP_BODY)+strlen(""));
sprintf(response, (char *) sc_hp, "", "", MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "h") ? "" : "", SC_I18N_HP_HEADING, SC_I18N_HP_BODY);
}
} else {
int already_retried = 0;
retry:
SC_CRLE(c, c->queries_lock);
for (size_t i = 0; i < c->queries_length; i++)
if (!strcmp(c->queries[i]->string, query) && c->queries[i]->opt == opt)
q = c->queries[i];
if (q) {
const char * l = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "l");
response = sc_queryhtml(q, MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "h" /* insecure http */), atoi(l ? l : "0")); /* MHD_create_response_from_buffer will free response (; */
if (MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "f") && q->results_length > 0) {
status_code = 307;
location = q->results[0]->url ? q->results[0]->url : SC_I18N_NO_HREFLINK;
}
SC_CUE(c, c->queries_lock);
} else {
SC_CUE(c, c->queries_lock);
sc_query_google(query, c, NULL, opt);
if (already_retried++) {
char * safequery = htmlspecialchars(query);
response = malloc(strlen((char*) sc_hp)+strlen(safequery)*2+strlen(SC_I18N_HP_ERROR_HEADING)+strlen(SC_I18N_HP_ERROR_BODY));
sprintf(response, (char *) sc_hp, safequery, safequery, SC_I18N_HP_ERROR_HEADING, SC_I18N_HP_ERROR_BODY);
free(safequery);
} else goto retry;
}
}
httpd_response = MHD_create_response_from_buffer (strlen(response), (void *) response, mhdrmm);
MHD_add_response_header(httpd_response, "Content-Type", content_type);
if (status_code >= 300 && status_code <= 399)
MHD_add_response_header(httpd_response, "Location", location);
ret = MHD_queue_response(connection, status_code, httpd_response);
MHD_destroy_response(httpd_response);
return ret;
}