209 lines
6.5 KiB
C
209 lines
6.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* pqcomm.h
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* Definitions common to frontends and backends.
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*
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* NOTE: for historical reasons, this does not correspond to pqcomm.c.
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* pqcomm.c's routines are declared in libpq.h.
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/libpq/pqcomm.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PQCOMM_H
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#define PQCOMM_H
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#include <sys/socket.h>
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#include <netdb.h>
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#ifdef HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif
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#include <netinet/in.h>
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#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
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#ifndef HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY
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#ifdef HAVE_STRUCT_SOCKADDR_STORAGE___SS_FAMILY
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#define ss_family __ss_family
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#else
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#error struct sockaddr_storage does not provide an ss_family member
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#endif
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#endif
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#ifdef HAVE_STRUCT_SOCKADDR_STORAGE___SS_LEN
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#define ss_len __ss_len
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#define HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN 1
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#endif
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#else /* !HAVE_STRUCT_SOCKADDR_STORAGE */
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/* Define a struct sockaddr_storage if we don't have one. */
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struct sockaddr_storage
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{
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union
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{
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struct sockaddr sa; /* get the system-dependent fields */
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int64 ss_align; /* ensures struct is properly aligned */
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char ss_pad[128]; /* ensures struct has desired size */
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} ss_stuff;
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};
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#define ss_family ss_stuff.sa.sa_family
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/* It should have an ss_len field if sockaddr has sa_len. */
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#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
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#define ss_len ss_stuff.sa.sa_len
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#define HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN 1
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#endif
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#endif /* HAVE_STRUCT_SOCKADDR_STORAGE */
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typedef struct
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{
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struct sockaddr_storage addr;
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ACCEPT_TYPE_ARG3 salen;
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} SockAddr;
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/* Configure the UNIX socket location for the well known port. */
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#define UNIXSOCK_PATH(path, port, sockdir) \
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snprintf(path, sizeof(path), "%s/.s.PGSQL.%d", \
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((sockdir) && *(sockdir) != '\0') ? (sockdir) : \
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DEFAULT_PGSOCKET_DIR, \
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(port))
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/*
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* The maximum workable length of a socket path is what will fit into
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* struct sockaddr_un. This is usually only 100 or so bytes :-(.
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*
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* For consistency, always pass a MAXPGPATH-sized buffer to UNIXSOCK_PATH(),
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* then complain if the resulting string is >= UNIXSOCK_PATH_BUFLEN bytes.
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* (Because the standard API for getaddrinfo doesn't allow it to complain in
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* a useful way when the socket pathname is too long, we have to test for
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* this explicitly, instead of just letting the subroutine return an error.)
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*/
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#define UNIXSOCK_PATH_BUFLEN sizeof(((struct sockaddr_un *) NULL)->sun_path)
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/*
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* These manipulate the frontend/backend protocol version number.
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*
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* The major number should be incremented for incompatible changes. The minor
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* number should be incremented for compatible changes (eg. additional
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* functionality).
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*
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* If a backend supports version m.n of the protocol it must actually support
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* versions m.[0..n]. Backend support for version m-1 can be dropped after a
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* `reasonable' length of time.
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*
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* A frontend isn't required to support anything other than the current
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* version.
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*/
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#define PG_PROTOCOL_MAJOR(v) ((v) >> 16)
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#define PG_PROTOCOL_MINOR(v) ((v) & 0x0000ffff)
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#define PG_PROTOCOL(m,n) (((m) << 16) | (n))
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/* The earliest and latest frontend/backend protocol version supported. */
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#define PG_PROTOCOL_EARLIEST PG_PROTOCOL(2,0)
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#define PG_PROTOCOL_LATEST PG_PROTOCOL(3,0)
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typedef uint32 ProtocolVersion; /* FE/BE protocol version number */
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typedef ProtocolVersion MsgType;
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/*
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* Packet lengths are 4 bytes in network byte order.
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*
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* The initial length is omitted from the packet layouts appearing below.
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*/
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typedef uint32 PacketLen;
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/*
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* Old-style startup packet layout with fixed-width fields. This is used in
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* protocol 1.0 and 2.0, but not in later versions. Note that the fields
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* in this layout are '\0' terminated only if there is room.
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*/
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#define SM_DATABASE 64
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#define SM_USER 32
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/* We append database name if db_user_namespace true. */
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#define SM_DATABASE_USER (SM_DATABASE+SM_USER+1) /* +1 for @ */
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#define SM_OPTIONS 64
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#define SM_UNUSED 64
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#define SM_TTY 64
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typedef struct StartupPacket
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{
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ProtocolVersion protoVersion; /* Protocol version */
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char database[SM_DATABASE]; /* Database name */
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/* Db_user_namespace appends dbname */
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char user[SM_USER]; /* User name */
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char options[SM_OPTIONS]; /* Optional additional args */
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char unused[SM_UNUSED]; /* Unused */
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char tty[SM_TTY]; /* Tty for debug output */
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} StartupPacket;
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extern bool Db_user_namespace;
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/*
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* In protocol 3.0 and later, the startup packet length is not fixed, but
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* we set an arbitrary limit on it anyway. This is just to prevent simple
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* denial-of-service attacks via sending enough data to run the server
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* out of memory.
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*/
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#define MAX_STARTUP_PACKET_LENGTH 10000
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/* These are the authentication request codes sent by the backend. */
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#define AUTH_REQ_OK 0 /* User is authenticated */
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#define AUTH_REQ_KRB4 1 /* Kerberos V4. Not supported any more. */
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#define AUTH_REQ_KRB5 2 /* Kerberos V5. Not supported any more. */
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#define AUTH_REQ_PASSWORD 3 /* Password */
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#define AUTH_REQ_CRYPT 4 /* crypt password. Not supported any more. */
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#define AUTH_REQ_MD5 5 /* md5 password */
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#define AUTH_REQ_SCM_CREDS 6 /* transfer SCM credentials */
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#define AUTH_REQ_GSS 7 /* GSSAPI without wrap() */
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#define AUTH_REQ_GSS_CONT 8 /* Continue GSS exchanges */
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#define AUTH_REQ_SSPI 9 /* SSPI negotiate without wrap() */
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#define AUTH_REQ_SASL 10 /* Begin SASL authentication */
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#define AUTH_REQ_SASL_CONT 11 /* Continue SASL authentication */
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#define AUTH_REQ_SASL_FIN 12 /* Final SASL message */
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typedef uint32 AuthRequest;
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/*
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* A client can also send a cancel-current-operation request to the postmaster.
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* This is uglier than sending it directly to the client's backend, but it
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* avoids depending on out-of-band communication facilities.
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*
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* The cancel request code must not match any protocol version number
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* we're ever likely to use. This random choice should do.
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*/
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#define CANCEL_REQUEST_CODE PG_PROTOCOL(1234,5678)
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typedef struct CancelRequestPacket
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{
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/* Note that each field is stored in network byte order! */
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MsgType cancelRequestCode; /* code to identify a cancel request */
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uint32 backendPID; /* PID of client's backend */
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uint32 cancelAuthCode; /* secret key to authorize cancel */
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} CancelRequestPacket;
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/*
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* A client can also start by sending a SSL or GSSAPI negotiation request to
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* get a secure channel.
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*/
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#define NEGOTIATE_SSL_CODE PG_PROTOCOL(1234,5679)
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#define NEGOTIATE_GSS_CODE PG_PROTOCOL(1234,5680)
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#endif /* PQCOMM_H */
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