c/apache_request.c - metacpan.org

/* Copyright 2000-2004 The Apache Software Foundation

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

   	http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

#include <errno.h>
#include <string.h>
#include "apache_request.h"
#include "apache_multipart_buffer.h"
int fill_buffer(multipart_buffer *self); /* needed for mozilla hack */

static void req_plustospace(char *str)
{
    register int x;
    for(x=0;str[x];x++) if(str[x] == '+') str[x] = ' ';
}

static int util_read(ApacheRequest *req, const char **rbuf)
{
    request_rec *r = req->r;
    int rc = OK;

    if ((rc = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR))) {
	return rc;
    }

    if (ap_should_client_block(r)) {
	char buff[HUGE_STRING_LEN];
	int rsize, len_read, rpos=0;
	long length = r->remaining;

	if (length > req->post_max && req->post_max > 0) {
	    ap_log_rerror(REQ_ERROR, "[libapreq] entity too large (%d, max=%d)",
			  (int)length, req->post_max);
	    return HTTP_REQUEST_ENTITY_TOO_LARGE;
	}

	*rbuf = ap_pcalloc(r->pool, length + 1);

	ap_hard_timeout("[libapreq] util_read", r);

	while ((len_read =
		ap_get_client_block(r, buff, sizeof(buff))) > 0) {
	    if ((rpos + len_read) > length) {
		rsize = length - rpos;
	    }
	    else {
		rsize = len_read;
	    }
	    memcpy((char*)*rbuf + rpos, buff, rsize);
	    rpos += rsize;
	}

	ap_kill_timeout(r);
    }

    return rc;
}

char *ApacheRequest_script_name(ApacheRequest *req)
{
    request_rec *r = req->r;
    char *tmp;

    if (r->path_info && *r->path_info) {
	int path_info_start = ap_find_path_info(r->uri, r->path_info);
	tmp = ap_pstrndup(r->pool, r->uri, path_info_start);
    }
    else {
	tmp = r->uri;
    }

    return tmp;
}

char *ApacheRequest_script_path(ApacheRequest *req)
{
    return ap_make_dirstr_parent(req->r->pool, ApacheRequest_script_name(req));
}

const char *ApacheRequest_param(ApacheRequest *req, const char *key)
{
    ApacheRequest_parse(req);
    return ap_table_get(req->parms, key);
}

static int make_params(void *data, const char *key, const char *val)
{
    array_header *arr = (array_header *)data;
    *(char **)ap_push_array(arr) = (char *)val;
    return 1;
}

array_header *ApacheRequest_params(ApacheRequest *req, const char *key)
{
    array_header *values = ap_make_array(req->r->pool, 4, sizeof(char *));
    ApacheRequest_parse(req);
    ap_table_do(make_params, (void*)values, req->parms, key, NULL);
    return values;
}

char *ApacheRequest_params_as_string(ApacheRequest *req, const char *key)
{
    char *retval = NULL;
    array_header *values = ApacheRequest_params(req, key);
    int i;

    for (i=0; i<values->nelts; i++) {
	retval = ap_pstrcat(req->r->pool,
			    retval ? retval : "",
			    ((char **)values->elts)[i],
			    (i == (values->nelts - 1)) ? NULL : ", ",
			    NULL);
    }

    return retval;
}

table *ApacheRequest_query_params(ApacheRequest *req, ap_pool *p)
{
    array_header *a = ap_palloc(p, sizeof *a);
    array_header *b = (array_header *)req->parms;

    a->elts     = b->elts;
    a->nelts    = req->nargs;

    a->nalloc   = a->nelts; /* COW hack: array push will induce copying */
    a->elt_size = sizeof(table_entry);
    return (table *)a;
}

table *ApacheRequest_post_params(ApacheRequest *req, ap_pool *p)
{
    array_header *a = ap_palloc(p, sizeof *a);
    array_header *b = (array_header *)req->parms;

    a->elts     = (void *)( (table_entry *)b->elts + req->nargs );
    a->nelts    = b->nelts - req->nargs;

    a->nalloc   = a->nelts; /* COW hack: array push will induce copying */
    a->elt_size = sizeof(table_entry);
    return (table *)a;
}

ApacheUpload *ApacheUpload_new(ApacheRequest *req)
{
    ApacheUpload *upload = (ApacheUpload *)
	ap_pcalloc(req->r->pool, sizeof(ApacheUpload));

    upload->next = NULL;
    upload->name = NULL;
    upload->info = NULL;
    upload->fp   = NULL;
    upload->size = 0;
    upload->req  = req;

    return upload;
}

ApacheUpload *ApacheUpload_find(ApacheUpload *upload, char *name)
{
    ApacheUpload *uptr;

    for (uptr = upload; uptr; uptr = uptr->next) {
	if (strEQ(uptr->name, name)) {
	    return uptr;
	}
    }

    return NULL;
}

ApacheRequest *ApacheRequest_new(request_rec *r)
{
    ApacheRequest *req = (ApacheRequest *)
	ap_pcalloc(r->pool, sizeof(ApacheRequest));

    req->status = OK;
    req->parms = ap_make_table(r->pool, DEFAULT_TABLE_NELTS);
    req->upload = NULL;
    req->post_max = -1;
    req->disable_uploads = 0;
    req->upload_hook = NULL;
    req->hook_data = NULL;
    req->temp_dir = NULL;
    req->parsed = 0;
    req->r = r;
    req->nargs = 0;

    return req;
}
static char x2c(const char *what)
{
    register char digit;

#ifndef CHARSET_EBCDIC
    digit = ((what[0] >= 'A') ? ((what[0] & 0xdf) - 'A') + 10 : (what[0] - '0'))
;
    digit *= 16;
    digit += (what[1] >= 'A' ? ((what[1] & 0xdf) - 'A') + 10 : (what[1] - '0'));
#else /*CHARSET_EBCDIC*/
    char xstr[5];
    xstr[0]='0';
    xstr[1]='x';
    xstr[2]=what[0];
    xstr[3]=what[1];
    xstr[4]='\0';
    digit = os_toebcdic[0xFF & ap_strtol(xstr, NULL, 16)];
#endif /*CHARSET_EBCDIC*/
    return (digit);
}


static unsigned int utf8_convert(char *str) {
    long x = 0;
    int i = 0;
    while (i < 4 ) {
	if ( ap_isxdigit(str[i]) != 0 ) {
	    if( ap_isdigit(str[i]) != 0 ) {
		x = x * 16 + str[i] - '0';
	    }
	    else {
		str[i] = tolower( str[i] );
		x = x * 16 + str[i] - 'a' + 10;
	    }
	}
	else {
	    return 0;
	}
	i++;
    }
    if(i < 3)
	return 0;
    return (x);
}

static int ap_unescape_url_u(char *url)
{
    register int x, y, badesc, badpath;

    badesc = 0;
    badpath = 0;
    for (x = 0, y = 0; url[y]; ++x, ++y) {
	if (url[y] != '%'){
	    url[x] = url[y];
	}
	else {
	    if(url[y + 1] == 'u' || url[y + 1] == 'U'){
		unsigned int c = utf8_convert(&url[y + 2]);
		y += 5;
		if(c < 0x80){
		    url[x] = c;
		}
                else if(c < 0x800) {
                    url[x] = 0xc0 | (c >> 6);
                    url[++x] = 0x80 | (c & 0x3f);
                }
		else if(c < 0x10000){
		    url[x] = (0xe0 | (c >> 12));
		    url[++x] = (0x80 | ((c >> 6) & 0x3f));
		    url[++x] = (0x80 | (c & 0x3f));
		}
		else if(c < 0x200000){
		    url[x] = 0xf0 | (c >> 18);
		    url[++x] = 0x80 | ((c >> 12) & 0x3f);
		    url[++x] = 0x80 | ((c >> 6) & 0x3f);
		    url[++x] = 0x80 | (c & 0x3f);
		}
		else if(c < 0x4000000){
		    url[x] = 0xf8 | (c >> 24);
		    url[++x] = 0x80 | ((c >> 18) & 0x3f);
		    url[++x] = 0x80 | ((c >> 12) & 0x3f);
		    url[++x] = 0x80 | ((c >> 6) & 0x3f);
		    url[++x] = 0x80 | (c & 0x3f);
		}
		else if(c < 0x8000000){
		    url[x] = 0xfe | (c >> 30);
		    url[++x] = 0x80 | ((c >> 24) & 0x3f);
		    url[++x] = 0x80 | ((c >> 18) & 0x3f);
		    url[++x] = 0x80 | ((c >> 12) & 0x3f);
		    url[++x] = 0x80 | ((c >> 6) & 0x3f);
		    url[++x] = 0x80 | (c & 0x3f);
		}
	    }
	    else {
		if (!ap_isxdigit(url[y + 1]) || !ap_isxdigit(url[y + 2])) {
		    badesc = 1;
		    url[x] = '%';
		}
		else {
		    url[x] = x2c(&url[y + 1]);
		    y += 2;
		    if (url[x] == '/' || url[x] == '\0')
			badpath = 1;
		}
	    }
	}
    }
    url[x] = '\0';
    if (badesc)
	return BAD_REQUEST;
    else if (badpath)
	return NOT_FOUND;
    else
	return OK;
}

static int urlword_dlm[] = {'&', ';', 0};

static char *my_urlword(pool *p, const char **line)
{
    char *res = NULL;
    const char *pos = *line;
    char ch;

    while ( (ch = *pos) != '\0' && ch != ';' && ch != '&') {
	++pos;
    }

    res = ap_pstrndup(p, *line, pos - *line);

    while (ch == ';' || ch == '&') {
	++pos;
	ch = *pos;
    }

    *line = pos;

    return res;
}


static void split_to_parms(ApacheRequest *req, const char *data)
{
    request_rec *r = req->r;
    const char *val;

    while (*data && (val = my_urlword(r->pool, &data))) {
	const char *key = ap_getword(r->pool, &val, '=');

	req_plustospace((char*)key);
	ap_unescape_url_u((char*)key);
	req_plustospace((char*)val);
	ap_unescape_url_u((char*)val);
	ap_table_add(req->parms, key, val);
    }

}

int ApacheRequest___parse(ApacheRequest *req)
{
    request_rec *r = req->r;
    int result;

    if (r->args) {
        split_to_parms(req, r->args);
        req->nargs = ((array_header *)req->parms)->nelts;
    }

    if (r->method_number == M_POST) {
	const char *ct = ap_table_get(r->headers_in, "Content-type");
	if (ct && strncaseEQ(ct, DEFAULT_ENCTYPE, DEFAULT_ENCTYPE_LENGTH)) {
	    result = ApacheRequest_parse_urlencoded(req);
	}
	else if (ct && strncaseEQ(ct, MULTIPART_ENCTYPE, MULTIPART_ENCTYPE_LENGTH)) {
	   result = ApacheRequest_parse_multipart(req);
	}
	else {
	    ap_log_rerror(REQ_ERROR,
			  "[libapreq] unknown content-type: `%s'", ct);
	    result = HTTP_INTERNAL_SERVER_ERROR;
	}
    }
    else {
	result = ApacheRequest_parse_urlencoded(req);
    }

    req->parsed = 1;
    return result;

}

int ApacheRequest_parse_urlencoded(ApacheRequest *req)
{
    request_rec *r = req->r;
    int rc = OK;

    if (r->method_number == M_POST) {
	const char *data = NULL, *type;

	type = ap_table_get(r->headers_in, "Content-Type");

	if (!strncaseEQ(type, DEFAULT_ENCTYPE, DEFAULT_ENCTYPE_LENGTH)) {
	    return DECLINED;
	}
	if ((rc = util_read(req, &data)) != OK) {
	    return rc;
	}
	if (data) {
	    split_to_parms(req, data);
	}
    }

    return OK;
}

static void remove_tmpfile(void *data) {
    ApacheUpload *upload = (ApacheUpload *) data;
    ApacheRequest *req = upload->req;

    if( ap_pfclose(req->r->pool, upload->fp) )
	ap_log_rerror(REQ_ERROR,
		      "[libapreq] close error on '%s'", upload->tempname);
#ifndef DEBUG
    if( remove(upload->tempname) )
	ap_log_rerror(REQ_ERROR,
		      "[libapreq] remove error on '%s'", upload->tempname);
#endif

    free(upload->tempname);
}

FILE *ApacheRequest_tmpfile(ApacheRequest *req, ApacheUpload *upload)
{
    request_rec *r = req->r;
    FILE *fp;
    char prefix[] = "apreq";
    char *name = NULL;
    int fd = 0; 
    int tries = 100;

    while (--tries > 0) {
	if ( (name = tempnam(req->temp_dir, prefix)) == NULL )
	    continue;
	fd = ap_popenf(r->pool, name, O_CREAT|O_EXCL|O_RDWR|O_BINARY, 0600);
	if ( fd >= 0 )
	    break; /* success */
	else
	    free(name);
    }

    if ( tries == 0  || (fp = ap_pfdopen(r->pool, fd, "w+" "b") ) == NULL ) {
	ap_log_rerror(REQ_ERROR, 
                      "[libapreq] could not create/open temp file: %s",
                      strerror(errno));
	if ( fd >= 0 ) { remove(name); free(name); }
	return NULL;
    }

    upload->fp = fp;
    upload->tempname = name;
    ap_register_cleanup(r->pool, (void *)upload,
			remove_tmpfile, ap_null_cleanup);
    return fp;

}

int ApacheRequest_parse_multipart(ApacheRequest *req)
{
    request_rec *r = req->r;
    int rc = OK;
    const char *ct = ap_table_get(r->headers_in, "Content-Type");
    long length;
    char *boundary;
    multipart_buffer *mbuff;
    ApacheUpload *upload = NULL;

    if (!ct) {
	ap_log_rerror(REQ_ERROR, "[libapreq] no Content-type header!");
	return HTTP_INTERNAL_SERVER_ERROR;
    }

    if ((rc = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR))) {
        return rc;
    }

    if (!ap_should_client_block(r)) {
	return rc;
    }

    if ((length = r->remaining) > req->post_max && req->post_max > 0) {
	ap_log_rerror(REQ_ERROR, "[libapreq] entity too large (%d, max=%d)",
		     (int)length, req->post_max);
	return HTTP_REQUEST_ENTITY_TOO_LARGE;
    }

    do {
        int blen;
        boundary = ap_getword(r->pool, &ct, '=');
        if (boundary == NULL)
            return DECLINED;
        blen = strlen(boundary);
        if (blen == 0 || blen < strlen("boundary"))
            return DECLINED;
        boundary += blen - strlen("boundary");
    } while (strcasecmp(boundary,"boundary") != 0);

    boundary = ap_getword_conf(r->pool, &ct);

    if (!(mbuff = multipart_buffer_new(boundary, length, r))) {
	return DECLINED;
    }

    while (!multipart_buffer_eof(mbuff)) {
	table *header = multipart_buffer_headers(mbuff);
	const char *cd, *param=NULL, *filename=NULL;
	char buff[FILLUNIT];
	int blen, wlen;

	if (!header) {
#ifdef DEBUG
            ap_log_rerror(REQ_ERROR,
		      "[libapreq] silently drop remaining '%ld' bytes", r->remaining);
#endif
            ap_hard_timeout("[libapreq] parse_multipart", r);
            while ( ap_get_client_block(r, buff, sizeof(buff)) > 0 )
                /* wait for more input to ignore */ ;
            ap_kill_timeout(r);
	    return OK;
	}

	if ((cd = ap_table_get(header, "Content-Disposition"))) {
	    const char *pair;

	    while (*cd && (pair = ap_getword(r->pool, &cd, ';'))) {
		const char *key;

		while (ap_isspace(*cd)) {
		    ++cd;
		}
		if (ap_ind(pair, '=')) {
		    key = ap_getword(r->pool, &pair, '=');
		    if(strcaseEQ(key, "name")) {
			param = ap_getword_conf(r->pool, &pair);
		    }
		    else if(strcaseEQ(key, "filename")) {
			filename = ap_getword_conf(r->pool, &pair);
		    }
		}
	    }
	    if (!filename) {
	        char *value = multipart_buffer_read_body(mbuff);
	        ap_table_add(req->parms, param, value);
		continue;
	    }
	    if (!param) continue; /* shouldn't happen, but just in case. */

            if (req->disable_uploads) {
                ap_log_rerror(REQ_ERROR, "[libapreq] file upload forbidden");
                return HTTP_FORBIDDEN;
            }

	    ap_table_add(req->parms, param, filename);

	    if (upload) {
		upload->next = ApacheUpload_new(req);
		upload = upload->next;
	    }
	    else {
		upload = ApacheUpload_new(req);
		req->upload = upload;
	    }

	    if (! req->upload_hook && ! ApacheRequest_tmpfile(req, upload) ) {
		return HTTP_INTERNAL_SERVER_ERROR;
	    }

	    upload->info = header;
	    upload->filename = ap_pstrdup(req->r->pool, filename);
	    upload->name = ap_pstrdup(req->r->pool, param);

            /* mozilla empty-file (missing CRLF) hack */
            fill_buffer(mbuff);
            if( strEQN(mbuff->buf_begin, mbuff->boundary, 
                      strlen(mbuff->boundary)) ) {
                r->remaining -= 2;
                continue; 
            }

	    while ((blen = multipart_buffer_read(mbuff, buff, sizeof(buff)))) {
		if (req->upload_hook != NULL) {
		    wlen = req->upload_hook(req->hook_data, buff, blen, upload);
		} else {
		    wlen = fwrite(buff, 1, blen, upload->fp);
		}
		if (wlen != blen) {
		    return HTTP_INTERNAL_SERVER_ERROR;
		}
		upload->size += wlen;
	    }

	    if (upload->size > 0 && (upload->fp != NULL)) {
		fseek(upload->fp, 0, 0);
	    }
	}
    }

    return OK;
}

#define Mult_s 1
#define Mult_m 60
#define Mult_h (60*60)
#define Mult_d (60*60*24)
#define Mult_M (60*60*24*30)
#define Mult_y (60*60*24*365)

static int expire_mult(char s)
{
    switch (s) {
    case 's':
	return Mult_s;
    case 'm':
	return Mult_m;
    case 'h':
	return Mult_h;
    case 'd':
	return Mult_d;
    case 'M':
	return Mult_M;
    case 'y':
	return Mult_y;
    default:
	return 1;
    };
}

static time_t expire_calc(char *time_str)
{
    int is_neg = 0, offset = 0;
    char buf[256];
    int ix = 0;

    if (*time_str == '-') {
	is_neg = 1;
	++time_str;
    }
    else if (*time_str == '+') {
	++time_str;
    }
    else if (strcaseEQ(time_str, "now")) {
	/*ok*/
    }
    else {
	return 0;
    }

    /* wtf, ap_isdigit() returns false for '1' !? */
    while (*time_str && (ap_isdigit(*time_str) || (*time_str == '1'))) {
	buf[ix++] = *time_str++;
    }
    buf[ix] = '\0';
    offset = atoi(buf);

    return time(NULL) +
	(expire_mult(*time_str) * (is_neg ? (0 - offset) : offset));
}

char *ApacheUtil_expires(pool *p, char *time_str, int type)
{
    time_t when;
    struct tm *tms;
    int sep = (type == EXPIRES_HTTP) ? ' ' : '-';

    if (!time_str) {
	return NULL;
    }

    when = expire_calc(time_str);

    if (!when) {
	return ap_pstrdup(p, time_str);
    }

    tms = gmtime(&when);
    return ap_psprintf(p,
		       "%s, %.2d%c%s%c%.2d %.2d:%.2d:%.2d GMT",
		       ap_day_snames[tms->tm_wday],
		       tms->tm_mday, sep, ap_month_snames[tms->tm_mon], sep,
		       tms->tm_year + 1900,
		       tms->tm_hour, tms->tm_min, tms->tm_sec);
}

char *ApacheRequest_expires(ApacheRequest *req, char *time_str)
{
    return ApacheUtil_expires(req->r->pool, time_str, EXPIRES_HTTP);
}
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