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auth_mellon_util.c
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/*
*
* auth_mellon_util.c: an authentication apache module
* Copyright © 2003-2007 UNINETT (http://www.uninett.no/)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <assert.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include "auth_mellon.h"
/* This function is used to get the url of the current request.
*
* Parameters:
* request_rec *r The current request.
*
* Returns:
* A string containing the full url of the current request.
* The string is allocated from r->pool.
*/
char *am_reconstruct_url(request_rec *r)
{
char *url;
/* This function will construct an full url for a given path relative to
* the root of the web site. To configure what hostname and port this
* function will use, see the UseCanonicalName configuration directive.
*/
url = ap_construct_url(r->pool, r->unparsed_uri, r);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"reconstruct_url: url==\"%s\", unparsed_uri==\"%s\"", url,
r->unparsed_uri);
return url;
}
/* This function builds an array of regexp backreferences
*
* Parameters:
* request_rec *r The current request.
* const am_cond_t *ce The condition
* const char *value Attribute value
* const ap_regmatch_t *regmatch regmatch_t from ap_regexec()
*
* Returns:
* An array of collected backreference strings
*/
const apr_array_header_t *am_cond_backrefs(request_rec *r,
const am_cond_t *ce,
const char *value,
const ap_regmatch_t *regmatch)
{
apr_array_header_t *backrefs;
const char **ref;
int nsub;
int i;
nsub = ce->regex->re_nsub + 1; /* +1 for %0 */
backrefs = apr_array_make(r->pool, nsub, sizeof(const char *));
backrefs->nelts = nsub;
ref = (const char **)(backrefs->elts);
for (i = 0; i < nsub; i++) {
if ((regmatch[i].rm_so == -1) || (regmatch[i].rm_eo == -1)) {
ref[i] = "";
} else {
int len = regmatch[i].rm_eo - regmatch[i].rm_so;
int off = regmatch[i].rm_so;
ref[i] = apr_pstrndup(r->pool, value + off, len);
}
}
return (const apr_array_header_t *)backrefs;
}
/* This function clones an am_cond_t and substitute value to
* match (both regexp and string) with backreferences from
* a previous regex match.
*
* Parameters:
* request_rec *r The current request.
* const am_cond_t *cond The am_cond_t to clone and substiture
* const apr_array_header_t *backrefs Collected backreferences
*
* Returns:
* The cloned am_cond_t
*/
const am_cond_t *am_cond_substitue(request_rec *r, const am_cond_t *ce,
const apr_array_header_t *backrefs)
{
am_cond_t *c;
const char *instr = ce->str;
apr_size_t inlen = strlen(instr);
const char *outstr = "";
size_t last;
size_t i;
c = (am_cond_t *)apr_pmemdup(r->pool, ce, sizeof(*ce));
c->str = outstr;
last = 0;
for (i = strcspn(instr, "%"); i < inlen; i += strcspn(instr + i, "%")) {
const char *fstr;
const char *ns;
const char *name;
const char *value;
apr_size_t flen;
apr_size_t pad;
apr_size_t nslen;
/*
* Make sure we got a %
*/
assert(instr[i] == '%');
/*
* Copy the format string in fstr. It can be a single
* digit (e.g.: %1) , or a curly-brace enclosed text
* (e.g.: %{12})
*/
fstr = instr + i + 1;
if (*fstr == '{') { /* Curly-brace enclosed text */
pad = 3; /* 3 for %{} */
fstr++;
flen = strcspn(fstr, "}");
/* If there is no closing }, we do not substitute */
if (fstr[flen] == '\0') {
pad = 2; /* 2 for %{ */
i += flen + pad;
break;
}
} else if (*fstr == '\0') { /* String ending by a % */
break;
} else { /* Single digit */
pad = 1; /* 1 for % */
flen = 1;
}
/*
* Try to extract a namespace (ns) and a name, e.g: %{ENV:foo}
*/
fstr = apr_pstrndup(r->pool, fstr, flen);
if ((nslen = strcspn(fstr, ":")) != flen) {
ns = apr_pstrndup(r->pool, fstr, nslen);
name = fstr + nslen + 1; /* +1 for : */
} else {
nslen = 0;
ns = "";
name = fstr;
}
value = NULL;
if ((*ns == '\0') && (strspn(fstr, "0123456789") == flen)) {
/*
* If fstr has only digits, this is a regexp backreference
*/
int d = (int)apr_atoi64(fstr);
if ((d >= 0) && (d < backrefs->nelts))
value = ((const char **)(backrefs->elts))[d];
} else if ((*ns == '\0') && (strcmp(fstr, "%") == 0)) {
/*
* %-escape
*/
value = fstr;
} else if (strcmp(ns, "ENV") == 0) {
/*
* ENV namespace. Get value from apache environment
*/
value = getenv(name);
}
/*
* If we did not find a value, substitue the
* format string with an empty string.
*/
if (value == NULL)
value = "";
/*
* Concatenate the value with leading text, and * keep track
* of the last location we copied in source string
*/
outstr = apr_pstrcat(r->pool, outstr,
apr_pstrndup(r->pool, instr + last, i - last),
value, NULL);
last = i + flen + pad;
/*
* Move index to the end of the format string
*/
i += flen + pad;
}
/*
* Copy text remaining after the last format string.
*/
outstr = apr_pstrcat(r->pool, outstr,
apr_pstrndup(r->pool, instr + last, i - last),
NULL);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"Directive %s, \"%s\" substituted into \"%s\"",
ce->directive, instr, outstr);
/*
* If this was a regexp, recompile it.
*/
if (ce->flags & AM_COND_FLAG_REG) {
int regex_flags = AP_REG_EXTENDED|AP_REG_NOSUB;
if (ce->flags & AM_COND_FLAG_NC)
regex_flags |= AP_REG_ICASE;
c->regex = ap_pregcomp(r->pool, outstr, regex_flags);
if (c->regex == NULL) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
"Invalid regular expression \"%s\"", outstr);
return ce;
}
}
return (const am_cond_t *)c;
}
/* This function checks if the user has access according
* to the MellonRequire and MellonCond directives.
*
* Parameters:
* request_rec *r The current request.
* am_cache_entry_t *session The current session.
*
* Returns:
* OK if the user has access and HTTP_FORBIDDEN if he doesn't.
*/
int am_check_permissions(request_rec *r, am_cache_entry_t *session)
{
am_dir_cfg_rec *dir_cfg;
int i, j;
int skip_or = 0;
const apr_array_header_t *backrefs = NULL;
dir_cfg = am_get_dir_cfg(r);
/* Iterate over all cond-directives */
for (i = 0; i < dir_cfg->cond->nelts; i++) {
const am_cond_t *ce;
const char *value = NULL;
int match = 0;
ce = &((am_cond_t *)(dir_cfg->cond->elts))[i];
/*
* Rule with ignore flog?
*/
if (ce->flags & AM_COND_FLAG_IGN)
continue;
/*
* We matched a [OR] rule, skip the next rules
* until we have one without [OR].
*/
if (skip_or) {
if (!(ce->flags & AM_COND_FLAG_OR))
skip_or = 0;
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"Skip %s, [OR] rule matched previously",
ce->directive);
continue;
}
/*
* look for a match on each value for this attribute,
* stop on first match.
*/
for (j = 0; (j < session->size) && !match; j++) {
const char *varname = NULL;
/*
* if MAP flag is set, check for remapped
* attribute name with mellonSetEnv
*/
if (ce->flags & AM_COND_FLAG_MAP)
varname = apr_hash_get(dir_cfg->envattr,
am_cache_entry_get_string(session,
&session->env[j].varname),
APR_HASH_KEY_STRING);
/*
* Otherwise or if not found, use the attribute name
* sent by the IdP.
*/
if (varname == NULL)
varname = am_cache_entry_get_string(session,
&session->env[j].varname);
if (strcmp(varname, ce->varname) != 0)
continue;
value = am_cache_entry_get_string(session, &session->env[j].value);
/*
* Substiture backrefs if available
*/
if ((ce->flags & AM_COND_FLAG_FSTR) && (backrefs != NULL))
ce = am_cond_substitue(r, ce, backrefs);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"Evaluate %s vs \"%s\"",
ce->directive, value);
if (value == NULL) {
match = 0; /* can not happen */
} else if (ce->flags & (AM_COND_FLAG_REG|AM_COND_FLAG_REF)) {
int nsub = ce->regex->re_nsub + 1;
ap_regmatch_t *regmatch;
regmatch = (ap_regmatch_t *)apr_palloc(r->pool,
nsub * sizeof(*regmatch));
match = !ap_regexec(ce->regex, value, nsub, regmatch, 0);
if (match)
backrefs = am_cond_backrefs(r, ce, value, regmatch);
} else if (ce->flags & AM_COND_FLAG_REG) {
match = !ap_regexec(ce->regex, value, 0, NULL, 0);
} else if (ce->flags & (AM_COND_FLAG_SUB|AM_COND_FLAG_NC)) {
match = (strcasestr(ce->str, value) != NULL);
} else if (ce->flags & AM_COND_FLAG_SUB) {
match = (strstr(ce->str, value) != NULL);
} else if (ce->flags & AM_COND_FLAG_NC) {
match = !strcasecmp(ce->str, value);
} else {
match = !strcmp(ce->str, value);
}
}
if (ce->flags & AM_COND_FLAG_NOT)
match = !match;
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"%s: %smatch", ce->directive,
(match == 0) ? "no ": "");
/*
* If no match, we stop here, except if it is an [OR] condition
*/
if (!match & !(ce->flags & AM_COND_FLAG_OR)) {
ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r,
"Client failed to match %s",
ce->directive);
return HTTP_FORBIDDEN;
}
/*
* Match on [OR] condition means we skip until a rule
* without [OR],
*/
if (match && (ce->flags & AM_COND_FLAG_OR))
skip_or = 1;
}
return OK;
}
/* This function sets default Cache-Control headers.
*
* Parameters:
* request_rec *r The request we are handling.
*
* Returns:
* Nothing.
*/
void am_set_cache_control_headers(request_rec *r)
{
/* Send Cache-Control header to ensure that:
* - no proxy in the path caches content inside this location (private),
* - user agent have to revalidate content on server (must-revalidate).
*
* But never prohibit specifically any user agent to cache or store content
*
* Setting the headers in err_headers_out ensures that they will be
* sent for all responses.
*/
apr_table_setn(r->err_headers_out,
"Cache-Control", "private, must-revalidate");
}
/* This function reads the post data for a request.
*
* The data is stored in a buffer allocated from the request pool.
* After successful operation *data contains a pointer to the data and
* *length contains the length of the data.
* The data will always be null-terminated.
*
* Parameters:
* request_rec *r The request we read the form data from.
* char **data Pointer to where we will store the pointer
* to the data we read.
* apr_size_t *length Pointer to where we will store the length
* of the data we read. Pass NULL if you don't
* need to know the length of the data.
*
* Returns:
* OK if we successfully read the POST data.
* An error if we fail to read the data.
*/
int am_read_post_data(request_rec *r, char **data, apr_size_t *length)
{
apr_size_t bytes_read;
apr_size_t bytes_left;
apr_size_t len;
long read_length;
int rc;
/* Prepare to receive data from the client. We request that apache
* dechunks data if it is chunked.
*/
rc = ap_setup_client_block(r, REQUEST_CHUNKED_DECHUNK);
if (rc != OK) {
return rc;
}
/* This function will send a 100 Continue response if the client is
* waiting for that. If the client isn't going to send data, then this
* function will return 0.
*/
if (!ap_should_client_block(r)) {
len = 0;
} else {
len = r->remaining;
}
if (length != NULL) {
*length = len;
}
*data = (char *)apr_palloc(r->pool, len + 1);
/* Make sure that the data is null-terminated. */
(*data)[len] = '\0';
bytes_read = 0;
bytes_left = len;
while (bytes_left > 0) {
/* Read data from the client. Returns 0 on EOF or error, the
* number of bytes otherwise.
*/
read_length = ap_get_client_block(r, &(*data)[bytes_read],
bytes_left);
if (read_length == 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"Failed to read POST data from client.");
return HTTP_INTERNAL_SERVER_ERROR;
}
bytes_read += read_length;
bytes_left -= read_length;
}
return OK;
}
/* extract_query_parameter is a function which extracts the value of
* a given parameter in a query string. The query string can be the
* query_string parameter of a GET request, or it can be the data
* passed to the web server in a POST request.
*
* Parameters:
* apr_pool_t *pool The memory pool which the memory for
* the value will be allocated from.
* const char *query_string Either the query_string from a GET
* request, or the data from a POST
* request.
* const char *name The name of the parameter to extract.
* Note that the search for this name is
* case sensitive.
*
* Returns:
* The value of the parameter or NULL if we don't find the parameter.
*/
char *am_extract_query_parameter(apr_pool_t *pool,
const char *query_string,
const char *name)
{
const char *ip;
const char *value_end;
apr_size_t namelen;
if (query_string == NULL) {
return NULL;
}
ip = query_string;
namelen = strlen(name);
/* Find parameter. Searches for /[^&]<name>[&=$]/.
* Moves ip to the first character after the name (either '&', '='
* or '\0').
*/
for (;;) {
/* First we find the name of the parameter. */
ip = strstr(ip, name);
if (ip == NULL) {
/* Parameter not found. */
return NULL;
}
/* Then we check what is before the parameter name. */
if (ip != query_string && ip[-1] != '&') {
/* Name not preceded by [^&]. */
ip++;
continue;
}
/* And last we check what follows the parameter name. */
if (ip[namelen] != '=' && ip[namelen] != '&'
&& ip[namelen] != '\0') {
/* Name not followed by [&=$]. */
ip++;
continue;
}
/* We have found the pattern. */
ip += namelen;
break;
}
/* Now ip points to the first character after the name. If this
* character is '&' or '\0', then this field doesn't have a value.
* If this character is '=', then this field has a value.
*/
if (ip[0] == '=') {
ip += 1;
}
/* The value is from ip to '&' or to the end of the string, whichever
* comes first. */
value_end = strchr(ip, '&');
if (value_end != NULL) {
/* '&' comes first. */
return apr_pstrndup(pool, ip, value_end - ip);
} else {
/* Value continues until the end of the string. */
return apr_pstrdup(pool, ip);
}
}
/* Convert a hexadecimal digit to an integer.
*
* Parameters:
* char c The digit we should convert.
*
* Returns:
* The digit as an integer, or -1 if it isn't a hex digit.
*/
static int am_unhex_digit(char c) {
if (c >= '0' && c <= '9') {
return c - '0';
} else if (c >= 'a' && c <= 'f') {
return c - 'a' + 0xa;
} else if (c >= 'A' && c <= 'F') {
return c - 'A' + 0xa;
} else {
return -1;
}
}
/* This function urldecodes a string in-place.
*
* Parameters:
* char *data The string to urldecode.
*
* Returns:
* OK if successful or HTTP_BAD_REQUEST if any escape sequence decodes to a
* null-byte ('\0'), or if an invalid escape sequence is found.
*/
int am_urldecode(char *data)
{
char *ip;
char *op;
int c1, c2;
if (data == NULL) {
return HTTP_BAD_REQUEST;
}
ip = data;
op = data;
while (*ip) {
switch (*ip) {
case '+':
*op = ' ';
ip++;
op++;
break;
case '%':
/* Decode the hex digits. Note that we need to check the
* result of the first conversion before attempting the
* second conversion -- otherwise we may read past the end
* of the string.
*/
c1 = am_unhex_digit(ip[1]);
if (c1 < 0) {
return HTTP_BAD_REQUEST;
}
c2 = am_unhex_digit(ip[2]);
if (c2 < 0) {
return HTTP_BAD_REQUEST;
}
*op = (c1 << 4) | c2;
if (*op == '\0') {
/* null-byte. */
return HTTP_BAD_REQUEST;
}
ip += 3;
op++;
break;
default:
*op = *ip;
ip++;
op++;
}
}
*op = '\0';
return OK;
}
/* This function urlencodes a string. It will escape all characters
* except a-z, A-Z, 0-9, '_' and '.'.
*
* Parameters:
* apr_pool_t *pool The pool we should allocate memory from.
* const char *str The string we should urlencode.
*
* Returns:
* The urlencoded string, or NULL if str == NULL.
*/
char *am_urlencode(apr_pool_t *pool, const char *str)
{
const char *ip;
apr_size_t length;
char *ret;
char *op;
int hi, low;
/* Return NULL if str is NULL. */
if(str == NULL) {
return NULL;
}
/* Find the length of the output string. */
length = 0;
for(ip = str; *ip; ip++) {
if(*ip >= 'a' && *ip <= 'z') {
length++;
} else if(*ip >= 'A' && *ip <= 'Z') {
length++;
} else if(*ip >= '0' && *ip <= '9') {
length++;
} else if(*ip == '_' || *ip == '.') {
length++;
} else {
length += 3;
}
}
/* Add space for null-terminator. */
length++;
/* Allocate memory for string. */
ret = (char *)apr_palloc(pool, length);
/* Encode string. */
for(ip = str, op = ret; *ip; ip++, op++) {
if(*ip >= 'a' && *ip <= 'z') {
*op = *ip;
} else if(*ip >= 'A' && *ip <= 'Z') {
*op = *ip;
} else if(*ip >= '0' && *ip <= '9') {
*op = *ip;
} else if(*ip == '_' || *ip == '.') {
*op = *ip;
} else {
*op = '%';
op++;
hi = (*ip & 0xf0) >> 4;
if(hi < 0xa) {
*op = '0' + hi;
} else {
*op = 'A' + hi - 0xa;
}
op++;
low = *ip & 0x0f;
if(low < 0xa) {
*op = '0' + low;
} else {
*op = 'A' + low - 0xa;
}
}
}
/* Make output string null-terminated. */
*op = '\0';
return ret;
}
/*
* Check that a URL is safe for redirect.
*
* Parameters:
* request_rec *r The request we are processing.
* const char *url The URL we should check.
*
* Returns:
* OK on success, HTTP_BAD_REQUEST otherwise.
*/
int am_check_url(request_rec *r, const char *url)
{
const char *i;
for (i = url; *i; i++) {
if (*i >= 0 && *i < ' ') {
/* Deny all control-characters. */
ap_log_rerror(APLOG_MARK, APLOG_ERR, HTTP_BAD_REQUEST, r,
"Control character detected in URL.");
return HTTP_BAD_REQUEST;
}
}
return OK;
}
/* This function generates a given number of (pseudo)random bytes.
* The current implementation uses OpenSSL's RAND_*-functions.
*
* Parameters:
* request_rec *r The request we are generating random bytes for.
* The request is used for configuration and
* error/warning reporting.
* void *dest The address if the buffer we should fill with data.
* apr_size_t count The number of random bytes to create.
*
* Returns:
* OK on success, or HTTP_INTERNAL_SERVER on failure.
*/
int am_generate_random_bytes(request_rec *r, void *dest, apr_size_t count)
{
int rc;
rc = RAND_bytes((unsigned char *)dest, (int)count);
if(rc != 1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"Error generating random data: %lu",
ERR_get_error());
return HTTP_INTERNAL_SERVER_ERROR;
}
return OK;
}
/* This function generates an id which is AM_ID_LENGTH characters long.
* The id will consist of hexadecimal characters.
*
* Parameters:
* request_rec *r The request we associate allocated memory with.
*
* Returns:
* The session id, made up of AM_ID_LENGTH hexadecimal characters,
* terminated by a null-byte.
*/
char *am_generate_id(request_rec *r)
{
int rc;
char *ret;
int rand_data_len;
unsigned char *rand_data;
int i;
unsigned char b;
int hi, low;
ret = (char *)apr_palloc(r->pool, AM_ID_LENGTH + 1);
/* We need to round the length of the random data _up_, in case the
* length of the session id isn't even.
*/
rand_data_len = (AM_ID_LENGTH + 1) / 2;
/* Fill the last rand_data_len bytes of the string with
* random bytes. This allows us to overwrite from the beginning of
* the string.
*/
rand_data = (unsigned char *)&ret[AM_ID_LENGTH - rand_data_len];
/* Generate random numbers. */
rc = am_generate_random_bytes(r, rand_data, rand_data_len);
if(rc != OK) {
return NULL;
}
/* Convert the random bytes to hexadecimal. Note that we will write
* AM_ID_LENGTH+1 characters if we have a non-even length of the
* session id. This is OK - we will simply overwrite the last character
* with the null-terminator afterwards.
*/
for(i = 0; i < AM_ID_LENGTH; i += 2) {
b = rand_data[i / 2];
hi = (b >> 4) & 0xf;
low = b & 0xf;
if(hi >= 0xa) {
ret[i] = 'a' + hi - 0xa;
} else {
ret[i] = '0' + hi;
}
if(low >= 0xa) {
ret[i+1] = 'a' + low - 0xa;
} else {
ret[i+1] = '0' + low;
}
}
/* Add null-terminator- */
ret[AM_ID_LENGTH] = '\0';
return ret;
}
/* This returns the directroy part of a path, a la dirname(3)
*
* Parameters:
* apr_pool_t p Pool to allocate memory from
* const char *path Path to extract directory from
*
* Returns:
* The directory part of path
*/
const char *am_filepath_dirname(apr_pool_t *p, const char *path)
{
char *cp;
/*
* Try Unix and then Windows style. Borrowed from
* apr_match_glob(), it seems it cannot be made more
* portable.
*/
if (((cp = strrchr(path, (int)'/')) == NULL) &&
((cp = strrchr(path, (int)'\\')) == NULL))
return ".";
return apr_pstrndup(p, path, cp - path);
}
/*
* malloc a buffer and fill it with a given file
*
* Parameters:
* apr_pool_t *conf The configuration pool. Valid as long as this
* server_rec *s The server record for the current server.
* const char *file The file path
*
* Returns:
* char * The file content
*/
char *am_getfile(apr_pool_t *conf, server_rec *s, const char *file)
{
apr_status_t rv;
char buffer[512];
apr_finfo_t finfo;
char *data;
apr_file_t *fd;
apr_size_t nbytes;
if (file == NULL)
return NULL;
if ((rv = apr_file_open(&fd, file, APR_READ, 0, conf)) != 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s,
"apr_file_open: Error opening \"%s\" [%d] \"%s\"",
file, rv, apr_strerror(rv, buffer, sizeof(buffer)));
return NULL;
}
if ((rv = apr_file_info_get(&finfo, APR_FINFO_SIZE, fd)) != 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s,
"apr_file_info_get: Error opening \"%s\" [%d] \"%s\"",
file, rv, apr_strerror(rv, buffer, sizeof(buffer)));
(void)apr_file_close(fd);
return NULL;
}
nbytes = finfo.size;
data = (char *)apr_palloc(conf, nbytes + 1);
rv = apr_file_read_full(fd, data, nbytes, NULL);
if (rv != 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s,
"apr_file_read_full: Error reading \"%s\" [%d] \"%s\"",
file, rv, apr_strerror(rv, buffer, sizeof(buffer)));
}
data[nbytes] = '\0';
(void)apr_file_close(fd);
return data;
}
/*
* Purge outdated saved POST requests.
*
* Parameters:
* request_rec *r The current request
*
* Returns:
* OK on success, or HTTP_INTERNAL_SERVER on failure.
*/
int am_postdir_cleanup(request_rec *r)
{
am_mod_cfg_rec *mod_cfg;
apr_dir_t *postdir;
apr_status_t rv;
char error_buffer[64];
apr_finfo_t afi;
char *fname;
int count;
apr_time_t expire_before;
mod_cfg = am_get_mod_cfg(r->server);
/* The oldes file we should keep. Delete files that are older. */
expire_before = apr_time_now() - mod_cfg->post_ttl * APR_USEC_PER_SEC;
/*
* Open our POST directory or create it.
*/
rv = apr_dir_open(&postdir, mod_cfg->post_dir, r->pool);
if (rv != 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"Unable to open MellonPostDirectory \"%s\": %s",
mod_cfg->post_dir,
apr_strerror(rv, error_buffer, sizeof(error_buffer)));
return HTTP_INTERNAL_SERVER_ERROR;
}
/*
* Purge outdated items
*/
count = 0;
do {
rv = apr_dir_read(&afi, APR_FINFO_NAME|APR_FINFO_CTIME, postdir);
if (rv != OK)
break;
/* Skip dot_files */
if (afi.name[0] == '.')
continue;