client.h

/*
 * Client definitions for the CUPS scheduler.
 *
 * Copyright © 2021-2022 by OpenPrinting.
 * Copyright © 2007-2018 by Apple Inc.
 * Copyright © 1997-2007 by Easy Software Products, all rights reserved.
 *
 * Licensed under Apache License v2.0.  See the file "LICENSE" for more
 * information.
 */

#ifdef HAVE_AUTHORIZATION_H
#  include <Security/Authorization.h>
#endif /* HAVE_AUTHORIZATION_H */


/*
 * HTTP client structure...
 */

struct cupsd_client_s
{
  int			number;		/* Connection number */
  http_t		*http;		/* HTTP client connection */
  ipp_t			*request,	/* IPP request information */
			*response;	/* IPP response information */
  cupsd_location_t	*best;		/* Best match for AAA */
  struct timeval	start;		/* Request start time */
  http_state_t		operation;	/* Request operation */
  off_t			bytes;		/* Bytes transferred for this request */
  int			is_browser;	/* Is the client a web browser? */
  int			type;		/* AuthType for username */
  char			username[HTTP_MAX_VALUE],
					/* Username from Authorization: line */
			password[HTTP_MAX_VALUE],
					/* Password from Authorization: line */
			uri[HTTP_MAX_URI],
					/* Localized URL/URI for GET/PUT */
			*filename,	/* Filename of output file */
			*command,	/* Command to run */
			*options,	/* Options for command */
			*query_string;	/* QUERY_STRING environment variable */
  int			file;		/* Input/output file */
  int			file_ready;	/* Input ready on file/pipe? */
  int			pipe_pid;	/* Pipe process ID (or 0 if not a pipe) */
  http_status_t		pipe_status;	/* HTTP status from pipe process */
  int			sent_header,	/* Non-zero if sent HTTP header */
			got_fields,	/* Non-zero if all fields seen */
			header_used;	/* Number of header bytes used */
  char			header[2048];	/* Header from CGI program */
  cups_lang_t		*language;	/* Language to use */
#ifdef HAVE_TLS
  int			auto_ssl;	/* Automatic test for SSL/TLS */
#endif /* HAVE_TLS */
  http_addr_t		clientaddr;	/* Client's server address */
  char			clientname[256];/* Client's server name for connection */
  int			clientport;	/* Client's server port for connection */
  char			servername[256];/* Server name for connection */
  int			serverport;	/* Server port for connection */
#ifdef HAVE_GSSAPI
  int			have_gss;	/* Have GSS credentials? */
  uid_t			gss_uid;	/* User ID for local prints */
#endif /* HAVE_GSSAPI */
#ifdef HAVE_AUTHORIZATION_H
  AuthorizationRef	authref;	/* Authorization ref */
#endif /* HAVE_AUTHORIZATION_H */
};

#define HTTP(con) ((con)->http)


/*
 * HTTP listener structure...
 */

typedef struct
{
  int			fd;		/* File descriptor for this server */
  http_addr_t		address;	/* Bind address of socket */
  http_encryption_t	encryption;	/* To encrypt or not to encrypt... */
#ifdef HAVE_ONDEMAND
  int			on_demand;	/* Is this a socket from launchd/systemd/upstart? */
#endif /* HAVE_ONDEMAND */
} cupsd_listener_t;


/*
 * Globals...
 */

VAR int			LastClientNumber VALUE(0),
					/* Last client connection number */
			LocalPort	VALUE(631),
					/* Local port to use */
			RemotePort	VALUE(0);
					/* Remote port to use */
VAR http_encryption_t	LocalEncryption	VALUE(HTTP_ENCRYPT_IF_REQUESTED);
					/* Local port encryption to use */
VAR cups_array_t	*Listeners	VALUE(NULL);
					/* Listening sockets */
VAR time_t		ListeningPaused	VALUE(0);
					/* Time when listening was paused */
VAR cups_array_t	*Clients	VALUE(NULL),
					/* HTTP clients */
			*ActiveClients	VALUE(NULL);
					/* Active HTTP clients */
VAR char		*ServerHeader	VALUE(NULL);
					/* Server header in requests */
VAR int			CGIPipes[2]	VALUE2(-1,-1);
					/* Pipes for CGI error/debug output */
VAR cupsd_statbuf_t	*CGIStatusBuffer VALUE(NULL);
					/* Status buffer for pipes */


/*
 * Prototypes...
 */

extern void	cupsdAcceptClient(cupsd_listener_t *lis);
extern void	cupsdCloseAllClients(void);
extern int	cupsdCloseClient(cupsd_client_t *con);
extern void	cupsdDeleteAllListeners(void);
extern void	cupsdPauseListening(void);
extern int	cupsdProcessIPPRequest(cupsd_client_t *con);
extern void	cupsdReadClient(cupsd_client_t *con);
extern void	cupsdResumeListening(void);
extern int	cupsdSendCommand(cupsd_client_t *con, char *command,
		                 char *options, int root);
extern int	cupsdSendError(cupsd_client_t *con, http_status_t code,
		               int auth_type);
extern int	cupsdSendHeader(cupsd_client_t *con, http_status_t code,
		                char *type, int auth_type);
extern void	cupsdShutdownClient(cupsd_client_t *con);
extern void	cupsdStartListening(void);
extern void	cupsdStopListening(void);
extern void	cupsdUpdateCGI(void);
extern void	cupsdWriteClient(cupsd_client_t *con);

#ifdef HAVE_TLS
extern int	cupsdEndTLS(cupsd_client_t *con);
extern int	cupsdStartTLS(cupsd_client_t *con);
#endif /* HAVE_TLS */