cups/http.h

   1 /*
   2  * "$Id$"
   3  *
   4  *   Hyper-Text Transport Protocol definitions for the Common UNIX Printing
   5  *   System (CUPS).
   6  *
   7  *   Copyright 1997-2001 by Easy Software Products, all rights reserved.
   8  *
   9  *   These coded instructions, statements, and computer programs are the
  10  *   property of Easy Software Products and are protected by Federal
  11  *   copyright law.  Distribution and use rights are outlined in the file
  12  *   "LICENSE.txt" which should have been included with this file.  If this
  13  *   file is missing or damaged please contact Easy Software Products
  14  *   at:
  15  *
  16  *       Attn: CUPS Licensing Information
  17  *       Easy Software Products
  18  *       44141 Airport View Drive, Suite 204
  19  *       Hollywood, Maryland 20636-3111 USA
  20  *
  21  *       Voice: (301) 373-9603
  22  *       EMail: cups-info@cups.org
  23  *         WWW: http://www.cups.org
  24  */
  25
  26 #ifndef _CUPS_HTTP_H_
  27 #  define _CUPS_HTTP_H_
  28
  29 /*
  30  * Include necessary headers...
  31  */
  32
  33 #  include <string.h>
  34 #  include <time.h>
  35 #  if defined(WIN32) || defined(__EMX__)
  36 #    include <winsock.h>
  37 #  else
  38 #    include <unistd.h>
  39 #    include <sys/time.h>
  40 #    include <sys/types.h>
  41 #    include <sys/socket.h>
  42 #    include <netdb.h>
  43 #    include <netinet/in.h>
  44 #    include <arpa/inet.h>
  45 #    include <netinet/in_systm.h>
  46 #    include <netinet/ip.h>
  47 #    include <netinet/tcp.h>
  48 #  endif /* WIN32 || __EMX__ */
  49
  50 #  include "md5.h"
  51
  52
  53 /*
  54  * C++ magic...
  55  */
  56
  57 #  ifdef __cplusplus
  58 extern "C" {
  59 #  endif /* __cplusplus */
  60
  61
  62 /*
  63  * Limits...
  64  */
  65
  66 #  define HTTP_MAX_URI          1024    /* Max length of URI string */
  67 #  define HTTP_MAX_HOST         256     /* Max length of hostname string */
  68 #  define HTTP_MAX_BUFFER       2048    /* Max length of data buffer */
  69 #  define HTTP_MAX_VALUE        256     /* Max header field value length */
  70
  71
  72 /*
  73  * HTTP state values...
  74  */
  75
  76 typedef enum                    /* States are server-oriented */
  77 {
  78   HTTP_WAITING,                 /* Waiting for command */
  79   HTTP_OPTIONS,                 /* OPTIONS command, waiting for blank line */
  80   HTTP_GET,                     /* GET command, waiting for blank line */
  81   HTTP_GET_SEND,                /* GET command, sending data */
  82   HTTP_HEAD,                    /* HEAD command, waiting for blank line */
  83   HTTP_POST,                    /* POST command, waiting for blank line */
  84   HTTP_POST_RECV,               /* POST command, receiving data */
  85   HTTP_POST_SEND,               /* POST command, sending data */
  86   HTTP_PUT,                     /* PUT command, waiting for blank line */
  87   HTTP_PUT_RECV,                /* PUT command, receiving data */
  88   HTTP_DELETE,                  /* DELETE command, waiting for blank line */
  89   HTTP_TRACE,                   /* TRACE command, waiting for blank line */
  90   HTTP_CLOSE,                   /* CLOSE command, waiting for blank line */
  91   HTTP_STATUS                   /* Command complete, sending status */
  92 } http_state_t;
  93
  94
  95 /*
  96  * HTTP version numbers...
  97  */
  98
  99 typedef enum
 100 {
 101   HTTP_0_9 = 9,                 /* HTTP/0.9 */
 102   HTTP_1_0 = 100,               /* HTTP/1.0 */
 103   HTTP_1_1 = 101                /* HTTP/1.1 */
 104 } http_version_t;
 105
 106
 107 /*
 108  * HTTP keep-alive values...
 109  */
 110
 111 typedef enum
 112 {
 113   HTTP_KEEPALIVE_OFF = 0,
 114   HTTP_KEEPALIVE_ON
 115 } http_keepalive_t;
 116
 117
 118 /*
 119  * HTTP transfer encoding values...
 120  */
 121
 122 typedef enum
 123 {
 124   HTTP_ENCODE_LENGTH,           /* Data is sent with Content-Length */
 125   HTTP_ENCODE_CHUNKED           /* Data is chunked */
 126 } http_encoding_t;
 127
 128
 129 /*
 130  * HTTP encryption values...
 131  */
 132
 133 typedef enum
 134 {
 135   HTTP_ENCRYPT_IF_REQUESTED,    /* Encrypt if requested (TLS upgrade) */
 136   HTTP_ENCRYPT_NEVER,           /* Never encrypt */
 137   HTTP_ENCRYPT_REQUIRED,        /* Encryption is required (TLS upgrade) */
 138   HTTP_ENCRYPT_ALWAYS           /* Always encrypt (SSL) */
 139 } http_encryption_t;
 140
 141
 142 /*
 143  * HTTP authentication types...
 144  */
 145
 146 typedef enum
 147 {
 148   HTTP_AUTH_NONE,               /* No authentication in use */
 149   HTTP_AUTH_BASIC,              /* Basic authentication in use */
 150   HTTP_AUTH_MD5,                /* Digest authentication in use */
 151   HTTP_AUTH_MD5_SESS,           /* MD5-session authentication in use */
 152   HTTP_AUTH_MD5_INT,            /* Digest authentication in use for body */
 153   HTTP_AUTH_MD5_SESS_INT        /* MD5-session authentication in use for body */
 154 } http_auth_t;
 155
 156
 157 /*
 158  * HTTP status codes...
 159  */
 160
 161 typedef enum
 162 {
 163   HTTP_ERROR = -1,              /* An error response from httpXxxx() */
 164
 165   HTTP_CONTINUE = 100,          /* Everything OK, keep going... */
 166   HTTP_SWITCHING_PROTOCOLS,     /* HTTP upgrade to TLS/SSL */
 167
 168   HTTP_OK = 200,                /* OPTIONS/GET/HEAD/POST/TRACE command was successful */
 169   HTTP_CREATED,                 /* PUT command was successful */
 170   HTTP_ACCEPTED,                /* DELETE command was successful */
 171   HTTP_NOT_AUTHORITATIVE,       /* Information isn't authoritative */
 172   HTTP_NO_CONTENT,              /* Successful command, no new data */
 173   HTTP_RESET_CONTENT,           /* Content was reset/recreated */
 174   HTTP_PARTIAL_CONTENT,         /* Only a partial file was recieved/sent */
 175
 176   HTTP_MULTIPLE_CHOICES = 300,  /* Multiple files match request */
 177   HTTP_MOVED_PERMANENTLY,       /* Document has moved permanently */
 178   HTTP_MOVED_TEMPORARILY,       /* Document has moved temporarily */
 179   HTTP_SEE_OTHER,               /* See this other link... */
 180   HTTP_NOT_MODIFIED,            /* File not modified */
 181   HTTP_USE_PROXY,               /* Must use a proxy to access this URI */
 182
 183   HTTP_BAD_REQUEST = 400,       /* Bad request */
 184   HTTP_UNAUTHORIZED,            /* Unauthorized to access host */
 185   HTTP_PAYMENT_REQUIRED,        /* Payment required */
 186   HTTP_FORBIDDEN,               /* Forbidden to access this URI */
 187   HTTP_NOT_FOUND,               /* URI was not found */
 188   HTTP_METHOD_NOT_ALLOWED,      /* Method is not allowed */
 189   HTTP_NOT_ACCEPTABLE,          /* Not Acceptable */
 190   HTTP_PROXY_AUTHENTICATION,    /* Proxy Authentication is Required */
 191   HTTP_REQUEST_TIMEOUT,         /* Request timed out */
 192   HTTP_CONFLICT,                /* Request is self-conflicting */
 193   HTTP_GONE,                    /* Server has gone away */
 194   HTTP_LENGTH_REQUIRED,         /* A content length or encoding is required */
 195   HTTP_PRECONDITION,            /* Precondition failed */
 196   HTTP_REQUEST_TOO_LARGE,       /* Request entity too large */
 197   HTTP_URI_TOO_LONG,            /* URI too long */
 198   HTTP_UNSUPPORTED_MEDIATYPE,   /* The requested media type is unsupported */
 199   HTTP_UPGRADE_REQUIRED = 426,  /* Upgrade to SSL/TLS required */
 200
 201   HTTP_SERVER_ERROR = 500,      /* Internal server error */
 202   HTTP_NOT_IMPLEMENTED,         /* Feature not implemented */
 203   HTTP_BAD_GATEWAY,             /* Bad gateway */
 204   HTTP_SERVICE_UNAVAILABLE,     /* Service is unavailable */
 205   HTTP_GATEWAY_TIMEOUT,         /* Gateway connection timed out */
 206   HTTP_NOT_SUPPORTED            /* HTTP version not supported */
 207 } http_status_t;
 208
 209
 210 /*
 211  * HTTP field names...
 212  */
 213
 214 typedef enum
 215 {
 216   HTTP_FIELD_UNKNOWN = -1,
 217   HTTP_FIELD_ACCEPT_LANGUAGE,
 218   HTTP_FIELD_ACCEPT_RANGES,
 219   HTTP_FIELD_AUTHORIZATION,
 220   HTTP_FIELD_CONNECTION,
 221   HTTP_FIELD_CONTENT_ENCODING,
 222   HTTP_FIELD_CONTENT_LANGUAGE,
 223   HTTP_FIELD_CONTENT_LENGTH,
 224   HTTP_FIELD_CONTENT_LOCATION,
 225   HTTP_FIELD_CONTENT_MD5,
 226   HTTP_FIELD_CONTENT_RANGE,
 227   HTTP_FIELD_CONTENT_TYPE,
 228   HTTP_FIELD_CONTENT_VERSION,
 229   HTTP_FIELD_DATE,
 230   HTTP_FIELD_HOST,
 231   HTTP_FIELD_IF_MODIFIED_SINCE,
 232   HTTP_FIELD_IF_UNMODIFIED_SINCE,
 233   HTTP_FIELD_KEEP_ALIVE,
 234   HTTP_FIELD_LAST_MODIFIED,
 235   HTTP_FIELD_LINK,
 236   HTTP_FIELD_LOCATION,
 237   HTTP_FIELD_RANGE,
 238   HTTP_FIELD_REFERER,
 239   HTTP_FIELD_RETRY_AFTER,
 240   HTTP_FIELD_TRANSFER_ENCODING,
 241   HTTP_FIELD_UPGRADE,
 242   HTTP_FIELD_USER_AGENT,
 243   HTTP_FIELD_WWW_AUTHENTICATE,
 244   HTTP_FIELD_MAX
 245 } http_field_t;
 246
 247
 248 /*
 249  * HTTP connection structure...
 250  */
 251
 252 typedef struct
 253 {
 254   int                   fd;             /* File descriptor for this socket */
 255   int                   blocking;       /* To block or not to block */
 256   int                   error;          /* Last error on read */
 257   time_t                activity;       /* Time since last read/write */
 258   http_state_t          state;          /* State of client */
 259   http_status_t         status;         /* Status of last request */
 260   http_version_t        version;        /* Protocol version */
 261   http_keepalive_t      keep_alive;     /* Keep-alive supported? */
 262   struct sockaddr_in    hostaddr;       /* Address of connected host */
 263   char                  hostname[HTTP_MAX_HOST],
 264                                         /* Name of connected host */
 265                         fields[HTTP_FIELD_MAX][HTTP_MAX_VALUE];
 266                                         /* Field values */
 267   char                  *data;          /* Pointer to data buffer */
 268   http_encoding_t       data_encoding;  /* Chunked or not */
 269   int                   data_remaining; /* Number of bytes left */
 270   int                   used;           /* Number of bytes used in buffer */
 271   char                  buffer[HTTP_MAX_BUFFER];
 272                                         /* Buffer for messages */
 273   int                   auth_type;      /* Authentication in use */
 274   md5_state_t           md5_state;      /* MD5 state */
 275   char                  nonce[HTTP_MAX_VALUE];
 276                                         /* Nonce value */
 277   int                   nonce_count;    /* Nonce count */
 278   void                  *tls;           /* TLS state information */
 279   http_encryption_t     encryption;     /* Encryption requirements */
 280 } http_t;
 281
 282
 283 /*
 284  * Prototypes...
 285  */
 286
 287 #  define               httpBlocking(http,b)    (http)->blocking = (b)
 288 extern int              httpCheck(http_t *http);
 289 #  define               httpClearFields(http)   memset((http)->fields, 0, sizeof((http)->fields)),\
 290                                                 httpSetField((http), HTTP_FIELD_HOST, (http)->hostname)
 291 extern void             httpClose(http_t *http);
 292 extern http_t           *httpConnect(const char *host, int port);
 293 extern http_t           *httpConnectEncrypt(const char *host, int port,
 294                                             http_encryption_t encrypt);
 295 extern int              httpDelete(http_t *http, const char *uri);
 296 extern int              httpEncryption(http_t *http, http_encryption_t e);
 297 #  define               httpError(http) ((http)->error)
 298 extern void             httpFlush(http_t *http);
 299 extern int              httpGet(http_t *http, const char *uri);
 300 extern char             *httpGets(char *line, int length, http_t *http);
 301 extern const char       *httpGetDateString(time_t t);
 302 extern time_t           httpGetDateTime(const char *s);
 303 #  define               httpGetField(http,field)        (http)->fields[field]
 304 extern char             *httpGetSubField(http_t *http, http_field_t field,
 305                                          const char *name, char *value);
 306 extern int              httpHead(http_t *http, const char *uri);
 307 extern void             httpInitialize(void);
 308 extern int              httpOptions(http_t *http, const char *uri);
 309 extern int              httpPost(http_t *http, const char *uri);
 310 extern int              httpPrintf(http_t *http, const char *format, ...);
 311 extern int              httpPut(http_t *http, const char *uri);
 312 extern int              httpRead(http_t *http, char *buffer, int length);
 313 extern int              httpReconnect(http_t *http);
 314 extern void             httpSeparate(const char *uri, char *method,
 315                                      char *username, char *host, int *port,
 316                                      char *resource);
 317 extern void             httpSetField(http_t *http, http_field_t field,
 318                                      const char *value);
 319 extern const char       *httpStatus(http_status_t status);
 320 extern int              httpTrace(http_t *http, const char *uri);
 321 extern http_status_t    httpUpdate(http_t *http);
 322 extern int              httpWrite(http_t *http, const char *buffer, int length);
 323 extern char             *httpEncode64(char *out, const char *in);
 324 extern char             *httpDecode64(char *out, const char *in);
 325 extern int              httpGetLength(http_t *http);
 326 extern char             *httpMD5(const char *, const char *, const char *,
 327                                  char [33]);
 328 extern char             *httpMD5Final(const char *, const char *, const char *,
 329                                       char [33]);
 330 extern char             *httpMD5String(const md5_byte_t *, char [33]);
 331
 332
 333 /*
 334  * C++ magic...
 335  */
 336
 337 #  ifdef __cplusplus
 338 }
 339 #  endif /* __cplusplus */
 340 #endif /* !_CUPS_HTTP_H_ */
 341
 342 /*
 343  * End of "$Id$".
 344  */