apps/include/http_server.h

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef OSSL_HTTP_SERVER_H
  11 # define OSSL_HTTP_SERVER_H
  12
  13 # include "apps.h"
  14
  15 # ifndef HAVE_FORK
  16 #  if defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_WINDOWS)
  17 #   define HAVE_FORK 0
  18 #  else
  19 #   define HAVE_FORK 1
  20 #  endif
  21 # endif
  22
  23 # if HAVE_FORK
  24 #  undef NO_FORK
  25 # else
  26 #  define NO_FORK
  27 # endif
  28
  29 # if !defined(NO_FORK) && !defined(OPENSSL_NO_SOCK) \
  30     && !defined(OPENSSL_NO_POSIX_IO)
  31 #  define HTTP_DAEMON
  32 #  include <sys/types.h>
  33 #  include <sys/wait.h>
  34 #  include <syslog.h>
  35 #  include <signal.h>
  36 #  define MAXERRLEN 1000 /* limit error text sent to syslog to 1000 bytes */
  37 # else
  38 #  undef LOG_DEBUG
  39 #  undef LOG_INFO
  40 #  undef LOG_WARNING
  41 #  undef LOG_ERR
  42 #  define LOG_DEBUG     7
  43 #  define LOG_INFO      6
  44 #  define LOG_WARNING   4
  45 #  define LOG_ERR       3
  46 # endif
  47
  48 /*-
  49  * Log a message to syslog if multi-threaded HTTP_DAEMON, else to bio_err
  50  * prog: the name of the current app
  51  * level: the severity of the message, e.g., LOG_ERR
  52  * fmt: message with potential extra parameters like with printf()
  53  * returns nothing
  54  */
  55 void log_message(const char *prog, int level, const char *fmt, ...);
  56
  57 # ifndef OPENSSL_NO_SOCK
  58 /*-
  59  * Initialize an HTTP server by setting up its listening BIO
  60  * prog: the name of the current app
  61  * port: the port to listen on
  62  * returns a BIO for accepting requests, NULL on error
  63  */
  64 BIO *http_server_init_bio(const char *prog, const char *port);
  65
  66 /*-
  67  * Accept an ASN.1-formatted HTTP request
  68  * it: the expected request ASN.1 type
  69  * preq: pointer to variable where to place the parsed request
  70  * ppath: pointer to variable where to place the request path, or NULL
  71  * pcbio: pointer to variable where to place the BIO for sending the response to
  72  * acbio: the listening bio (typically as returned by http_server_init_bio())
  73  * found_keep_alive: for returning flag if client requests persistent connection
  74  * prog: the name of the current app, for diagnostics only
  75  * port: the local port listening to, for diagnostics only
  76  * accept_get: whether to accept GET requests (in addition to POST requests)
  77  * timeout: connection timeout (in seconds), or 0 for none/infinite
  78  * returns 0 in case caller should retry, then *preq == *ppath == *pcbio == NULL
  79  * returns -1 on fatal error; also then holds *preq == *ppath == *pcbio == NULL
  80  * returns 1 otherwise. In this case it is guaranteed that *pcbio != NULL while
  81  * *ppath == NULL and *preq == NULL if and only if the request is invalid,
  82  * On return value 1 the caller is responsible for sending an HTTP response,
  83  * using http_server_send_asn1_resp() or http_server_send_status().
  84  * The caller must free any non-NULL *preq, *ppath, and *pcbio pointers.
  85  */
  86 int http_server_get_asn1_req(const ASN1_ITEM *it, ASN1_VALUE **preq,
  87                              char **ppath, BIO **pcbio, BIO *acbio,
  88                              int *found_keep_alive,
  89                              const char *prog, const char *port,
  90                              int accept_get, int timeout);
  91
  92 /*-
  93  * Send an ASN.1-formatted HTTP response
  94  * cbio: destination BIO (typically as returned by http_server_get_asn1_req())
  95  *       note: cbio should not do an encoding that changes the output length
  96  * keep_alive: grant persistent connnection
  97  * content_type: string identifying the type of the response
  98  * it: the response ASN.1 type
  99  * resp: the response to send
 100  * returns 1 on success, 0 on failure
 101  */
 102 int http_server_send_asn1_resp(BIO *cbio, int keep_alive,
 103                                const char *content_type,
 104                                const ASN1_ITEM *it, const ASN1_VALUE *resp);
 105
 106 /*-
 107  * Send a trivial HTTP response, typically to report an error or OK
 108  * cbio: destination BIO (typically as returned by http_server_get_asn1_req())
 109  * status: the status code to send
 110  * reason: the corresponding human-readable string
 111  * returns 1 on success, 0 on failure
 112  */
 113 int http_server_send_status(BIO *cbio, int status, const char *reason);
 114
 115 # endif
 116
 117 # ifdef HTTP_DAEMON
 118 extern int multi;
 119 extern int acfd;
 120
 121 void socket_timeout(int signum);
 122 void spawn_loop(const char *prog);
 123 # endif
 124
 125 #endif