SAPI.c

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/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Original design:  Shane Caraveo <shane@caraveo.com>                  |
   | Authors: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   +----------------------------------------------------------------------+
*/
 
#include <ctype.h>
#include <sys/stat.h>
#include <locale.h>
 
#include "php.h"
#include "SAPI.h"
#include "php_variables.h"
#include "php_ini.h"
#ifdef ZTS
#include "TSRM.h"
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#elif defined(PHP_WIN32)
#include "win32/time.h"
#endif
 
#include "rfc1867.h"
 
#include "php_content_types.h"
 
#ifdef ZTS
SAPI_API int sapi_globals_id;
SAPI_API size_t sapi_globals_offset;
#else
sapi_globals_struct sapi_globals;
#endif
 
static void _type_dtor(zval *zv)
{
    free(Z_PTR_P(zv));
}
 
static void sapi_globals_ctor(sapi_globals_struct *sapi_globals)
{
    memset(sapi_globals, 0, sizeof(*sapi_globals));
    zend_hash_init(&sapi_globals->known_post_content_types, 8, NULL, _type_dtor, 1);
    php_setup_sapi_content_types();
}
 
static void sapi_globals_dtor(sapi_globals_struct *sapi_globals)
{
    zend_hash_destroy(&sapi_globals->known_post_content_types);
}
 
/* True globals (no need for thread safety) */
SAPI_API sapi_module_struct sapi_module;
 
 
SAPI_API void sapi_startup(sapi_module_struct *sf)
{
    sf->ini_entries = NULL;
    sapi_module = *sf;
 
#ifdef ZTS
    ts_allocate_fast_id(&sapi_globals_id, &sapi_globals_offset, sizeof(sapi_globals_struct), (ts_allocate_ctor) sapi_globals_ctor, (ts_allocate_dtor) sapi_globals_dtor);
# ifdef PHP_WIN32
    _configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
# endif
#else
    sapi_globals_ctor(&sapi_globals);
#endif
 
#ifdef PHP_WIN32
    tsrm_win32_startup();
#endif
 
    reentrancy_startup();
}
 
SAPI_API void sapi_shutdown(void)
{
#ifdef ZTS
    ts_free_id(sapi_globals_id);
#else
    sapi_globals_dtor(&sapi_globals);
#endif
 
    reentrancy_shutdown();
 
#ifdef PHP_WIN32
    tsrm_win32_shutdown();
#endif
}
 
 
SAPI_API void sapi_free_header(sapi_header_struct *sapi_header)
{
    efree(sapi_header->header);
}
 
/* {{{ call a header function */
PHP_FUNCTION(header_register_callback)
{
    zend_fcall_info fci;
    zend_fcall_info_cache fcc;
 
    if (zend_parse_parameters(ZEND_NUM_ARGS(), "f", &fci, &fcc) == FAILURE) {
        RETURN_THROWS();
    }
 
    if (Z_TYPE(SG(callback_func)) != IS_UNDEF) {
        zval_ptr_dtor(&SG(callback_func));
        SG(fci_cache) = empty_fcall_info_cache;
    }
 
    /* Don't store callback if headers have already been sent:
     * It won't get used and we won't have a chance to release it. */
    if (!SG(headers_sent)) {
        ZVAL_COPY(&SG(callback_func), &fci.function_name);
    }
 
    RETURN_TRUE;
}
/* }}} */
 
static void sapi_run_header_callback(zval *callback)
{
    int   error;
    zend_fcall_info fci;
    char *callback_error = NULL;
    zval retval;
 
    if (zend_fcall_info_init(callback, 0, &fci, &SG(fci_cache), NULL, &callback_error) == SUCCESS) {
        fci.retval = &retval;
 
        error = zend_call_function(&fci, &SG(fci_cache));
        if (error == FAILURE) {
            goto callback_failed;
        } else {
            zval_ptr_dtor(&retval);
        }
    } else {
callback_failed:
        php_error_docref(NULL, E_WARNING, "Could not call the sapi_header_callback");
    }
 
    if (callback_error) {
        efree(callback_error);
    }
}
 
SAPI_API void sapi_handle_post(void *arg)
{
    if (SG(request_info).post_entry && SG(request_info).content_type_dup) {
        SG(request_info).post_entry->post_handler(SG(request_info).content_type_dup, arg);
        efree(SG(request_info).content_type_dup);
        SG(request_info).content_type_dup = NULL;
    }
}
 
SAPI_API void sapi_read_post_data(void)
{
    sapi_post_entry *post_entry;
    uint32_t content_type_length = (uint32_t)strlen(SG(request_info).content_type);
    char *content_type = estrndup(SG(request_info).content_type, content_type_length);
    char *p;
    char oldchar=0;
    void (*post_reader_func)(void) = NULL;
 
 
    /* dedicated implementation for increased performance:
     * - Make the content type lowercase
     * - Trim descriptive data, stay with the content-type only
     */
    for (p = content_type; p < content_type + content_type_length; p++) {
        switch (*p) {
            case ';':
            case ',':
            case ' ':
                content_type_length = p-content_type;
                oldchar = *p;
                *p = 0;
                break;
            default:
                *p = tolower(*p);
                break;
        }
    }
 
    /* now try to find an appropriate POST content handler */
    if ((post_entry = zend_hash_str_find_ptr(&SG(known_post_content_types), content_type,
            content_type_length)) != NULL) {
        /* found one, register it for use */
        SG(request_info).post_entry = post_entry;
        post_reader_func = post_entry->post_reader;
    } else {
        /* fallback */
        SG(request_info).post_entry = NULL;
        if (UNEXPECTED(!sapi_module.default_post_reader)) {
            /* this should not happen as there should always be a default_post_reader */
            SG(request_info).content_type_dup = NULL;
            sapi_module.sapi_error(E_WARNING, "Unsupported content type:  '%s'", content_type);
            efree(content_type);
            return;
        }
    }
    if (oldchar) {
        *(p-1) = oldchar;
    }
 
    /* the content_type_dup is not set at this stage so no need to try to free it first */
    SG(request_info).content_type_dup = content_type;
 
    if(post_reader_func) {
        post_reader_func();
    }
 
    if(sapi_module.default_post_reader) {
        sapi_module.default_post_reader();
    }
}
 
SAPI_API size_t sapi_read_post_block(char *buffer, size_t buflen)
{
    size_t read_bytes;
 
    if (!sapi_module.read_post) {
        return 0;
    }
 
    read_bytes = sapi_module.read_post(buffer, buflen);
 
    if (read_bytes > 0) {
        /* gogo */
        SG(read_post_bytes) += read_bytes;
    }
    if (read_bytes < buflen) {
        /* done */
        SG(post_read) = 1;
    }
 
    return read_bytes;
}
 
SAPI_API SAPI_POST_READER_FUNC(sapi_read_standard_form_data)
{
    zend_long post_max_size = REQUEST_PARSE_BODY_OPTION_GET(post_max_size, SG(post_max_size));
 
    if (post_max_size > 0 && SG(request_info).content_length > post_max_size) {
        php_error_docref(NULL, E_WARNING, "POST Content-Length of " ZEND_LONG_FMT " bytes exceeds the limit of " ZEND_LONG_FMT " bytes",
                    SG(request_info).content_length, post_max_size);
        return;
    }
 
 
    SG(request_info).request_body = php_stream_temp_create_ex(TEMP_STREAM_DEFAULT, SAPI_POST_BLOCK_SIZE, PG(upload_tmp_dir));
 
    if (sapi_module.read_post) {
        size_t read_bytes;
 
        for (;;) {
            char buffer[SAPI_POST_BLOCK_SIZE];
 
            read_bytes = sapi_read_post_block(buffer, SAPI_POST_BLOCK_SIZE);
 
            if (read_bytes > 0) {
                if (php_stream_write(SG(request_info).request_body, buffer, read_bytes) != read_bytes) {
                    /* if parts of the stream can't be written, purge it completely */
                    php_stream_truncate_set_size(SG(request_info).request_body, 0);
                    php_error_docref(NULL, E_WARNING, "POST data can't be buffered; all data discarded");
                    break;
                }
            }
 
            if (post_max_size > 0 && SG(read_post_bytes) > post_max_size) {
                php_error_docref(NULL, E_WARNING, "Actual POST length does not match Content-Length, and exceeds " ZEND_LONG_FMT " bytes", post_max_size);
                break;
            }
 
            if (read_bytes < SAPI_POST_BLOCK_SIZE) {
                /* done */
                break;
            }
        }
        php_stream_rewind(SG(request_info).request_body);
    }
}
 
 
static inline char *get_default_content_type(uint32_t prefix_len, uint32_t *len)
{
    char *mimetype, *charset, *content_type;
    uint32_t mimetype_len, charset_len;
 
    if (SG(default_mimetype)) {
        mimetype = SG(default_mimetype);
        mimetype_len = (uint32_t)strlen(SG(default_mimetype));
    } else {
        mimetype = SAPI_DEFAULT_MIMETYPE;
        mimetype_len = sizeof(SAPI_DEFAULT_MIMETYPE) - 1;
    }
    if (SG(default_charset)) {
        charset = SG(default_charset);
        charset_len = (uint32_t)strlen(SG(default_charset));
    } else {
        charset = SAPI_DEFAULT_CHARSET;
        charset_len = sizeof(SAPI_DEFAULT_CHARSET) - 1;
    }
 
    if (*charset && strncasecmp(mimetype, "text/", 5) == 0) {
        char *p;
 
        *len = prefix_len + mimetype_len + sizeof("; charset=") - 1 + charset_len;
        content_type = (char*)emalloc(*len + 1);
        p = content_type + prefix_len;
        p = zend_mempcpy(p, mimetype, mimetype_len);
        p = zend_mempcpy(p, "; charset=", sizeof("; charset=") - 1);
        memcpy(p, charset, charset_len + 1);
    } else {
        *len = prefix_len + mimetype_len;
        content_type = (char*)emalloc(*len + 1);
        memcpy(content_type + prefix_len, mimetype, mimetype_len + 1);
    }
    return content_type;
}
 
 
SAPI_API char *sapi_get_default_content_type(void)
{
    uint32_t len;
 
    return get_default_content_type(0, &len);
}
 
 
SAPI_API void sapi_get_default_content_type_header(sapi_header_struct *default_header)
{
    uint32_t len;
 
    default_header->header = get_default_content_type(sizeof("Content-type: ")-1, &len);
    default_header->header_len = len;
    memcpy(default_header->header, "Content-type: ", sizeof("Content-type: ") - 1);
}
 
/*
 * Add charset on content-type header if the MIME type starts with
 * "text/", the default_charset directive is not empty and
 * there is not already a charset option in there.
 *
 * If "mimetype" is non-NULL, it should point to a pointer allocated
 * with emalloc(). If a charset is added, the string will be
 * re-allocated and the new length is returned.  If mimetype is
 * unchanged, 0 is returned.
 *
 */
SAPI_API size_t sapi_apply_default_charset(char **mimetype, size_t len)
{
    char *charset, *newtype;
    size_t newlen;
    charset = SG(default_charset) ? SG(default_charset) : SAPI_DEFAULT_CHARSET;
 
    if (*mimetype != NULL) {
        if (*charset && strncmp(*mimetype, "text/", 5) == 0 && strstr(*mimetype, "charset=") == NULL) {
            newlen = len + (sizeof(";charset=")-1) + strlen(charset);
            newtype = emalloc(newlen + 1);
            PHP_STRLCPY(newtype, *mimetype, newlen + 1, len);
            strlcat(newtype, ";charset=", newlen + 1);
            strlcat(newtype, charset, newlen + 1);
            efree(*mimetype);
            *mimetype = newtype;
            return newlen;
        }
    }
    return 0;
}
 
SAPI_API void sapi_activate_headers_only(void)
{
    if (SG(request_info).headers_read == 1)
        return;
    SG(request_info).headers_read = 1;
    zend_llist_init(&SG(sapi_headers).headers, sizeof(sapi_header_struct),
            (void (*)(void *)) sapi_free_header, 0);
    SG(sapi_headers).send_default_content_type = 1;
 
    /* SG(sapi_headers).http_response_code = 200; */
    SG(sapi_headers).http_status_line = NULL;
    SG(sapi_headers).mimetype = NULL;
    SG(read_post_bytes) = 0;
    SG(request_info).request_body = NULL;
    SG(request_info).current_user = NULL;
    SG(request_info).current_user_length = 0;
    SG(request_info).no_headers = 0;
    SG(request_info).post_entry = NULL;
    SG(global_request_time) = 0;
 
    /*
     * It's possible to override this general case in the activate() callback,
     * if necessary.
     */
    if (SG(request_info).request_method && !strcmp(SG(request_info).request_method, "HEAD")) {
        SG(request_info).headers_only = 1;
    } else {
        SG(request_info).headers_only = 0;
    }
    if (SG(server_context)) {
        SG(request_info).cookie_data = sapi_module.read_cookies();
        if (sapi_module.activate) {
            sapi_module.activate();
        }
    }
    if (sapi_module.input_filter_init ) {
        sapi_module.input_filter_init();
    }
}
 
/*
 * Called from php_request_startup() for every request.
 */
 
SAPI_API void sapi_activate(void)
{
    zend_llist_init(&SG(sapi_headers).headers, sizeof(sapi_header_struct), (void (*)(void *)) sapi_free_header, 0);
    SG(sapi_headers).send_default_content_type = 1;
 
    /*
    SG(sapi_headers).http_response_code = 200;
    */
    SG(sapi_headers).http_status_line = NULL;
    SG(sapi_headers).mimetype = NULL;
    SG(headers_sent) = 0;
    ZVAL_UNDEF(&SG(callback_func));
    SG(read_post_bytes) = 0;
    SG(request_info).request_body = NULL;
    SG(request_info).current_user = NULL;
    SG(request_info).current_user_length = 0;
    SG(request_info).no_headers = 0;
    SG(request_info).post_entry = NULL;
    SG(request_info).proto_num = 1000; /* Default to HTTP 1.0 */
    SG(global_request_time) = 0;
    SG(post_read) = 0;
    /* It's possible to override this general case in the activate() callback, if necessary. */
    if (SG(request_info).request_method && !strcmp(SG(request_info).request_method, "HEAD")) {
        SG(request_info).headers_only = 1;
    } else {
        SG(request_info).headers_only = 0;
    }
    SG(rfc1867_uploaded_files) = NULL;
    SG(request_parse_body_context).throw_exceptions = false;
    memset(&SG(request_parse_body_context).options_cache, 0, sizeof(SG(request_parse_body_context).options_cache));
 
    /* Handle request method */
    if (SG(server_context)) {
        if (PG(enable_post_data_reading)
        &&  SG(request_info).content_type
        &&  SG(request_info).request_method
        && !strcmp(SG(request_info).request_method, "POST")) {
            /* HTTP POST may contain form data to be processed into variables
             * depending on given content type */
            sapi_read_post_data();
        } else {
            SG(request_info).content_type_dup = NULL;
        }
 
        /* Cookies */
        SG(request_info).cookie_data = sapi_module.read_cookies();
    }
    if (sapi_module.activate) {
        sapi_module.activate();
    }
    if (sapi_module.input_filter_init) {
        sapi_module.input_filter_init();
    }
}
 
 
static void sapi_send_headers_free(void)
{
    if (SG(sapi_headers).http_status_line) {
        efree(SG(sapi_headers).http_status_line);
        SG(sapi_headers).http_status_line = NULL;
    }
}
 
SAPI_API void sapi_deactivate_module(void)
{
    zend_llist_destroy(&SG(sapi_headers).headers);
    if (SG(request_info).request_body) {
        SG(request_info).request_body = NULL;
    } else if (SG(server_context)) {
        if (!SG(post_read)) {
            /* make sure we've consumed all request input data */
            char dummy[SAPI_POST_BLOCK_SIZE];
            size_t read_bytes;
 
            do {
                read_bytes = sapi_read_post_block(dummy, SAPI_POST_BLOCK_SIZE);
            } while (SAPI_POST_BLOCK_SIZE == read_bytes);
        }
    }
    if (SG(request_info).auth_user) {
        efree(SG(request_info).auth_user);
        SG(request_info).auth_user = NULL;
    }
    if (SG(request_info).auth_password) {
        efree(SG(request_info).auth_password);
        SG(request_info).auth_password = NULL;
    }
    if (SG(request_info).auth_digest) {
        efree(SG(request_info).auth_digest);
        SG(request_info).auth_digest = NULL;
    }
    if (SG(request_info).content_type_dup) {
        efree(SG(request_info).content_type_dup);
    }
    if (SG(request_info).current_user) {
        efree(SG(request_info).current_user);
    }
    if (sapi_module.deactivate) {
        sapi_module.deactivate();
    }
}
 
SAPI_API void sapi_deactivate_destroy(void)
{
    if (SG(rfc1867_uploaded_files)) {
        destroy_uploaded_files_hash();
    }
    if (SG(sapi_headers).mimetype) {
        efree(SG(sapi_headers).mimetype);
        SG(sapi_headers).mimetype = NULL;
    }
    sapi_send_headers_free();
    SG(sapi_started) = 0;
    SG(headers_sent) = 0;
    SG(request_info).headers_read = 0;
    SG(global_request_time) = 0;
}
 
SAPI_API void sapi_deactivate(void)
{
    sapi_deactivate_module();
    sapi_deactivate_destroy();
}
 
 
SAPI_API void sapi_initialize_empty_request(void)
{
    SG(server_context) = NULL;
    SG(request_info).request_method = NULL;
    SG(request_info).auth_digest = SG(request_info).auth_user = SG(request_info).auth_password = NULL;
    SG(request_info).content_type_dup = NULL;
}
 
 
static int sapi_extract_response_code(const char *header_line)
{
    int code = 200;
    const char *ptr;
 
    for (ptr = header_line; *ptr; ptr++) {
        if (*ptr == ' ' && *(ptr + 1) != ' ') {
            code = atoi(ptr + 1);
            break;
        }
    }
 
    return code;
}
 
 
static void sapi_update_response_code(int ncode)
{
    /* if the status code did not change, we do not want
       to change the status line, and no need to change the code */
    if (SG(sapi_headers).http_response_code == ncode) {
        return;
    }
 
    if (SG(sapi_headers).http_status_line) {
        efree(SG(sapi_headers).http_status_line);
        SG(sapi_headers).http_status_line = NULL;
    }
    SG(sapi_headers).http_response_code = ncode;
}
 
/*
 * since zend_llist_del_element only removes one matched item once,
 * we should remove them manually
 */
static void sapi_remove_header(zend_llist *l, char *name, size_t len) {
    sapi_header_struct *header;
    zend_llist_element *next;
    zend_llist_element *current=l->head;
 
    while (current) {
        header = (sapi_header_struct *)(current->data);
        next = current->next;
        if (header->header_len > len && header->header[len] == ':'
                && !strncasecmp(header->header, name, len)) {
            if (current->prev) {
                current->prev->next = next;
            } else {
                l->head = next;
            }
            if (next) {
                next->prev = current->prev;
            } else {
                l->tail = current->prev;
            }
            sapi_free_header(header);
            efree(current);
            --l->count;
        }
        current = next;
    }
}
 
SAPI_API int sapi_add_header_ex(const char *header_line, size_t header_line_len, bool duplicate, bool replace)
{
    sapi_header_line ctr = {0};
    int r;
 
    ctr.line = header_line;
    ctr.line_len = header_line_len;
 
    r = sapi_header_op(replace ? SAPI_HEADER_REPLACE : SAPI_HEADER_ADD,
            &ctr);
 
    if (!duplicate)
        efree((void *) header_line);
 
    return r;
}
 
static void sapi_header_add_op(sapi_header_op_enum op, sapi_header_struct *sapi_header)
{
    if (!sapi_module.header_handler ||
        (SAPI_HEADER_ADD & sapi_module.header_handler(sapi_header, op, &SG(sapi_headers)))) {
        if (op == SAPI_HEADER_REPLACE) {
            char *colon_offset = strchr(sapi_header->header, ':');
 
            if (colon_offset) {
                char sav = *colon_offset;
 
                *colon_offset = 0;
                sapi_remove_header(&SG(sapi_headers).headers, sapi_header->header, strlen(sapi_header->header));
                *colon_offset = sav;
            }
        }
        zend_llist_add_element(&SG(sapi_headers).headers, (void *) sapi_header);
    } else {
        sapi_free_header(sapi_header);
    }
}
 
SAPI_API int sapi_header_op(sapi_header_op_enum op, void *arg)
{
    sapi_header_struct sapi_header;
    char *colon_offset;
    char *header_line;
    size_t header_line_len;
    int http_response_code;
 
    if (SG(headers_sent) && !SG(request_info).no_headers) {
        const char *output_start_filename = php_output_get_start_filename();
        int output_start_lineno = php_output_get_start_lineno();
 
        if (output_start_filename) {
            sapi_module.sapi_error(E_WARNING, "Cannot modify header information - headers already sent by (output started at %s:%d)",
                output_start_filename, output_start_lineno);
        } else {
            sapi_module.sapi_error(E_WARNING, "Cannot modify header information - headers already sent");
        }
        return FAILURE;
    }
 
    switch (op) {
        case SAPI_HEADER_SET_STATUS:
            sapi_update_response_code((int)(intptr_t) arg);
            return SUCCESS;
 
        case SAPI_HEADER_ADD:
        case SAPI_HEADER_REPLACE:
        case SAPI_HEADER_DELETE: {
                sapi_header_line *p = arg;
 
                if (!p->line || !p->line_len) {
                    return FAILURE;
                }
                header_line = estrndup(p->line, p->line_len);
                header_line_len = p->line_len;
                http_response_code = p->response_code;
                break;
            }
 
        case SAPI_HEADER_DELETE_ALL:
            if (sapi_module.header_handler) {
                sapi_module.header_handler(&sapi_header, op, &SG(sapi_headers));
            }
            zend_llist_clean(&SG(sapi_headers).headers);
            return SUCCESS;
 
        default:
            return FAILURE;
    }
 
    /* cut off trailing spaces, linefeeds and carriage-returns */
    if (header_line_len && isspace(header_line[header_line_len-1])) {
        do {
            header_line_len--;
        } while(header_line_len && isspace(header_line[header_line_len-1]));
        header_line[header_line_len]='\0';
    }
 
    if (op == SAPI_HEADER_DELETE) {
        if (strchr(header_line, ':')) {
            efree(header_line);
            sapi_module.sapi_error(E_WARNING, "Header to delete may not contain colon.");
            return FAILURE;
        }
        if (sapi_module.header_handler) {
            sapi_header.header = header_line;
            sapi_header.header_len = header_line_len;
            sapi_module.header_handler(&sapi_header, op, &SG(sapi_headers));
        }
        sapi_remove_header(&SG(sapi_headers).headers, header_line, header_line_len);
        efree(header_line);
        return SUCCESS;
    } else {
        /* new line/NUL character safety check */
        uint32_t i;
        for (i = 0; i < header_line_len; i++) {
            /* RFC 7230 ch. 3.2.4 deprecates folding support */
            if (header_line[i] == '\n' || header_line[i] == '\r') {
                efree(header_line);
                sapi_module.sapi_error(E_WARNING, "Header may not contain "
                        "more than a single header, new line detected");
                return FAILURE;
            }
            if (header_line[i] == '\0') {
                efree(header_line);
                sapi_module.sapi_error(E_WARNING, "Header may not contain NUL bytes");
                return FAILURE;
            }
        }
    }
 
    sapi_header.header = header_line;
    sapi_header.header_len = header_line_len;
 
    /* Check the header for a few cases that we have special support for in SAPI */
    if (header_line_len>=5
        && !strncasecmp(header_line, "HTTP/", 5)) {
        /* filter out the response code */
        sapi_update_response_code(sapi_extract_response_code(header_line));
        /* sapi_update_response_code doesn't free the status line if the code didn't change */
        if (SG(sapi_headers).http_status_line) {
            efree(SG(sapi_headers).http_status_line);
        }
        SG(sapi_headers).http_status_line = header_line;
        return SUCCESS;
    } else {
        colon_offset = strchr(header_line, ':');
        if (colon_offset) {
            *colon_offset = 0;
            if (!strcasecmp(header_line, "Content-Type")) {
                char *ptr = colon_offset+1, *mimetype = NULL, *newheader;
                size_t len = header_line_len - (ptr - header_line), newlen;
                while (*ptr == ' ') {
                    ptr++;
                    len--;
                }
 
                mimetype = estrdup(ptr);
                newlen = sapi_apply_default_charset(&mimetype, len);
                if (!SG(sapi_headers).mimetype){
                    SG(sapi_headers).mimetype = estrdup(mimetype);
                }
 
                if (newlen != 0) {
                    newlen += sizeof("Content-type: ");
                    newheader = emalloc(newlen);
                    PHP_STRLCPY(newheader, "Content-type: ", newlen, sizeof("Content-type: ")-1);
                    strlcat(newheader, mimetype, newlen);
                    sapi_header.header = newheader;
                    sapi_header.header_len = (uint32_t)(newlen - 1);
                    efree(header_line);
                }
                efree(mimetype);
                SG(sapi_headers).send_default_content_type = 0;
            } else if (!strcasecmp(header_line, "Content-Length")) {
                /* Script is setting Content-length. The script cannot reasonably
                 * know the size of the message body after compression, so it's best
                 * to disable compression altogether. This contributes to making scripts
                 * portable between setups that have and don't have zlib compression
                 * enabled globally. See req #44164 */
                zend_string *key = ZSTR_INIT_LITERAL("zlib.output_compression", 0);
                zend_alter_ini_entry_chars(key,
                    "0", sizeof("0") - 1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
                zend_string_release_ex(key, 0);
            } else if (!strcasecmp(header_line, "Location")) {
                if ((SG(sapi_headers).http_response_code < 300 ||
                    SG(sapi_headers).http_response_code > 399) &&
                    SG(sapi_headers).http_response_code != 201) {
                    /* Return a Found Redirect if one is not already specified */
                    if (http_response_code) { /* user specified redirect code */
                        sapi_update_response_code(http_response_code);
                    } else if (SG(request_info).proto_num > 1000 &&
                       SG(request_info).request_method &&
                       strcmp(SG(request_info).request_method, "HEAD") &&
                       strcmp(SG(request_info).request_method, "GET")) {
                        sapi_update_response_code(303);
                    } else {
                        sapi_update_response_code(302);
                    }
                }
            } else if (!strcasecmp(header_line, "WWW-Authenticate")) { /* HTTP Authentication */
                sapi_update_response_code(401); /* authentication-required */
            }
            if (sapi_header.header==header_line) {
                *colon_offset = ':';
            }
        }
    }
    if (http_response_code) {
        sapi_update_response_code(http_response_code);
    }
    sapi_header_add_op(op, &sapi_header);
    return SUCCESS;
}
 
 
SAPI_API int sapi_send_headers(void)
{
    int retval;
    int ret = FAILURE;
 
    if (SG(headers_sent) || SG(request_info).no_headers) {
        return SUCCESS;
    }
 
    /* Success-oriented. We set headers_sent to 1 here to avoid an infinite loop
     * in case of an error situation.
     */
    if (SG(sapi_headers).send_default_content_type && sapi_module.send_headers) {
        uint32_t len = 0;
        char *default_mimetype = get_default_content_type(0, &len);
 
        if (default_mimetype && len) {
            sapi_header_struct default_header;
 
            SG(sapi_headers).mimetype = default_mimetype;
 
            default_header.header_len = sizeof("Content-type: ") - 1 + len;
            default_header.header = emalloc(default_header.header_len + 1);
 
            memcpy(default_header.header, "Content-type: ", sizeof("Content-type: ") - 1);
            memcpy(default_header.header + sizeof("Content-type: ") - 1, SG(sapi_headers).mimetype, len + 1);
 
            sapi_header_add_op(SAPI_HEADER_ADD, &default_header);
        } else {
            efree(default_mimetype);
        }
        SG(sapi_headers).send_default_content_type = 0;
    }
 
    if (Z_TYPE(SG(callback_func)) != IS_UNDEF) {
        zval cb;
        ZVAL_COPY_VALUE(&cb, &SG(callback_func));
        ZVAL_UNDEF(&SG(callback_func));
        sapi_run_header_callback(&cb);
        zval_ptr_dtor(&cb);
    }
 
    SG(headers_sent) = 1;
 
    if (sapi_module.send_headers) {
        retval = sapi_module.send_headers(&SG(sapi_headers));
    } else {
        retval = SAPI_HEADER_DO_SEND;
    }
 
    switch (retval) {
        case SAPI_HEADER_SENT_SUCCESSFULLY:
            ret = SUCCESS;
            break;
        case SAPI_HEADER_DO_SEND: {
                sapi_header_struct http_status_line;
                char buf[255];
 
                if (SG(sapi_headers).http_status_line) {
                    http_status_line.header = SG(sapi_headers).http_status_line;
                    http_status_line.header_len = (uint32_t)strlen(SG(sapi_headers).http_status_line);
                } else {
                    http_status_line.header = buf;
                    http_status_line.header_len = slprintf(buf, sizeof(buf), "HTTP/1.0 %d X", SG(sapi_headers).http_response_code);
                }
                sapi_module.send_header(&http_status_line, SG(server_context));
            }
            zend_llist_apply_with_argument(&SG(sapi_headers).headers, (llist_apply_with_arg_func_t) sapi_module.send_header, SG(server_context));
            if(SG(sapi_headers).send_default_content_type) {
                sapi_header_struct default_header;
 
                sapi_get_default_content_type_header(&default_header);
                sapi_module.send_header(&default_header, SG(server_context));
                sapi_free_header(&default_header);
            }
            sapi_module.send_header(NULL, SG(server_context));
            ret = SUCCESS;
            break;
        case SAPI_HEADER_SEND_FAILED:
            SG(headers_sent) = 0;
            ret = FAILURE;
            break;
    }
 
    sapi_send_headers_free();
 
    return ret;
}
 
 
SAPI_API int sapi_register_post_entries(const sapi_post_entry *post_entries)
{
    const sapi_post_entry *p=post_entries;
 
    while (p->content_type) {
        if (sapi_register_post_entry(p) == FAILURE) {
            return FAILURE;
        }
        p++;
    }
    return SUCCESS;
}
 
 
SAPI_API int sapi_register_post_entry(const sapi_post_entry *post_entry)
{
    int ret;
    zend_string *key;
    if (SG(sapi_started) && EG(current_execute_data)) {
        return FAILURE;
    }
    key = zend_string_init(post_entry->content_type, post_entry->content_type_len, 1);
    GC_MAKE_PERSISTENT_LOCAL(key);
    ret = zend_hash_add_mem(&SG(known_post_content_types), key,
            (void *) post_entry, sizeof(sapi_post_entry)) ? SUCCESS : FAILURE;
    zend_string_release_ex(key, 1);
    return ret;
}
 
SAPI_API void sapi_unregister_post_entry(const sapi_post_entry *post_entry)
{
    if (SG(sapi_started) && EG(current_execute_data)) {
        return;
    }
    zend_hash_str_del(&SG(known_post_content_types), post_entry->content_type,
            post_entry->content_type_len);
}
 
 
SAPI_API int sapi_register_default_post_reader(void (*default_post_reader)(void))
{
    if (SG(sapi_started) && EG(current_execute_data)) {
        return FAILURE;
    }
    sapi_module.default_post_reader = default_post_reader;
    return SUCCESS;
}
 
 
SAPI_API int sapi_register_treat_data(void (*treat_data)(int arg, char *str, zval *destArray))
{
    if (SG(sapi_started) && EG(current_execute_data)) {
        return FAILURE;
    }
    sapi_module.treat_data = treat_data;
    return SUCCESS;
}
 
SAPI_API int sapi_register_input_filter(unsigned int (*input_filter)(int arg, const char *var, char **val, size_t val_len, size_t *new_val_len), unsigned int (*input_filter_init)(void))
{
    if (SG(sapi_started) && EG(current_execute_data)) {
        return FAILURE;
    }
    sapi_module.input_filter = input_filter;
    sapi_module.input_filter_init = input_filter_init;
    return SUCCESS;
}
 
SAPI_API int sapi_flush(void)
{
    if (sapi_module.flush) {
        sapi_module.flush(SG(server_context));
        return SUCCESS;
    } else {
        return FAILURE;
    }
}
 
SAPI_API zend_stat_t *sapi_get_stat(void)
{
    if (sapi_module.get_stat) {
        return sapi_module.get_stat();
    } else {
        if (!SG(request_info).path_translated || (VCWD_STAT(SG(request_info).path_translated, &SG(global_stat)) == -1)) {
            return NULL;
        }
        return &SG(global_stat);
    }
}
 
SAPI_API char *sapi_getenv(const char *name, size_t name_len)
{
    char *value, *tmp;
 
    if (!sapi_module.getenv) {
        return NULL;
    }
    if (!strncasecmp(name, "HTTP_PROXY", name_len)) {
        /* Ugly fix for HTTP_PROXY issue, see bug #72573 */
        return NULL;
    }
    tmp = sapi_module.getenv(name, name_len);
    if (!tmp) {
        return NULL;
    }
    value = estrdup(tmp);
#ifdef PHP_WIN32
    if (strlen(sapi_module.name) == sizeof("cgi-fcgi") - 1 && !strcmp(sapi_module.name, "cgi-fcgi")) {
        /* XXX more modules to go, if needed. */
        free(tmp);
    }
#endif
    if (sapi_module.input_filter) {
        sapi_module.input_filter(PARSE_STRING, name, &value, strlen(value), NULL);
    }
    return value;
}
 
SAPI_API int sapi_get_fd(int *fd)
{
    if (sapi_module.get_fd) {
        return sapi_module.get_fd(fd);
    } else {
        return FAILURE;
    }
}
 
SAPI_API int sapi_force_http_10(void)
{
    if (sapi_module.force_http_10) {
        return sapi_module.force_http_10();
    } else {
        return FAILURE;
    }
}
 
 
SAPI_API int sapi_get_target_uid(uid_t *obj)
{
    if (sapi_module.get_target_uid) {
        return sapi_module.get_target_uid(obj);
    } else {
        return FAILURE;
    }
}
 
SAPI_API int sapi_get_target_gid(gid_t *obj)
{
    if (sapi_module.get_target_gid) {
        return sapi_module.get_target_gid(obj);
    } else {
        return FAILURE;
    }
}
 
SAPI_API double sapi_get_request_time(void)
{
    if(SG(global_request_time)) return SG(global_request_time);
 
    if (!sapi_module.get_request_time
            || sapi_module.get_request_time(&SG(global_request_time)) == FAILURE) {
        struct timeval tp = {0};
        if (!gettimeofday(&tp, NULL)) {
            SG(global_request_time) = (double)(tp.tv_sec + tp.tv_usec / 1000000.00);
        } else {
            SG(global_request_time) = (double)time(0);
        }
    }
    return SG(global_request_time);
}
 
SAPI_API void sapi_terminate_process(void) {
    if (sapi_module.terminate_process) {
        sapi_module.terminate_process();
    }
}
 
SAPI_API void sapi_add_request_header(const char *var, unsigned int var_len, char *val, unsigned int val_len, void *arg) /* {{{ */
{
    zval *return_value = (zval*)arg;
    char *buf = NULL;
 
    ALLOCA_FLAG(use_heap)
 
    if (var_len > 5 &&
        var[0] == 'H' &&
        var[1] == 'T' &&
        var[2] == 'T' &&
        var[3] == 'P' &&
        var[4] == '_') {
 
        const char *p;
        char *str;
 
        var_len -= 5;
        p = var + 5;
        var = str = buf = do_alloca(var_len + 1, use_heap);
        *str++ = *p++;
        while (*p) {
            if (*p == '_') {
                *str++ = '-';
                p++;
                if (*p) {
                    *str++ = *p++;
                }
            } else if (*p >= 'A' && *p <= 'Z') {
                *str++ = (*p++ - 'A' + 'a');
            } else {
                *str++ = *p++;
            }
        }
        *str = 0;
    } else if (var_len == sizeof("CONTENT_TYPE")-1 &&
               memcmp(var, "CONTENT_TYPE", sizeof("CONTENT_TYPE")-1) == 0) {
        var = "Content-Type";
    } else if (var_len == sizeof("CONTENT_LENGTH")-1 &&
               memcmp(var, "CONTENT_LENGTH", sizeof("CONTENT_LENGTH")-1) == 0) {
        var = "Content-Length";
    } else {
        return;
    }
    add_assoc_stringl_ex(return_value, var, var_len, val, val_len);
    if (buf) {
        free_alloca(buf, use_heap);
    }
}
/* }}} */