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libpq-be.h
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/*------------------------------------------------------------------------- * * libpq_be.h * This file contains definitions for structures and externs used * by the postmaster during client authentication. * * Note that this is backend-internal and is NOT exported to clients. * Structs that need to be client-visible are in pqcomm.h. * * * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/libpq/libpq-be.h * *------------------------------------------------------------------------- */ #ifndef LIBPQ_BE_H #define LIBPQ_BE_H #ifdef HAVE_SYS_TIME_H #include <sys/time.h> #endif #ifdef USE_SSL #include <openssl/ssl.h> #include <openssl/err.h> #endif #ifdef HAVE_NETINET_TCP_H #include <netinet/tcp.h> #endif #ifdef ENABLE_GSS #if defined(HAVE_GSSAPI_H) #include <gssapi.h> #else #include <gssapi/gssapi.h> #endif /* HAVE_GSSAPI_H */ /* * GSSAPI brings in headers that set a lot of things in the global namespace on win32, * that doesn't match the msvc build. It gives a bunch of compiler warnings that we ignore, * but also defines a symbol that simply does not exist. Undefine it again. */ #ifdef WIN32_ONLY_COMPILER #undef HAVE_GETADDRINFO #endif #endif /* ENABLE_GSS */ #ifdef ENABLE_SSPI #define SECURITY_WIN32 #if defined(WIN32) && !defined(WIN32_ONLY_COMPILER) #include <ntsecapi.h> #endif #include <security.h> #undef SECURITY_WIN32 #ifndef ENABLE_GSS /* * Define a fake structure compatible with GSSAPI on Unix. */ typedef struct { void *value; int length; } gss_buffer_desc; #endif #endif /* ENABLE_SSPI */ #include "datatype/timestamp.h" #include "libpq/hba.h" #include "libpq/pqcomm.h" typedef enum CAC_state { CAC_OK, CAC_STARTUP, CAC_SHUTDOWN, CAC_RECOVERY, CAC_TOOMANY, CAC_WAITBACKUP } CAC_state; /* * GSSAPI specific state information */ #if defined(ENABLE_GSS) | defined(ENABLE_SSPI) typedef struct { gss_buffer_desc outbuf; /* GSSAPI output token buffer */ #ifdef ENABLE_GSS gss_cred_id_t cred; /* GSSAPI connection cred's */ gss_ctx_id_t ctx; /* GSSAPI connection context */ gss_name_t name; /* GSSAPI client name */ #endif } pg_gssinfo; #endif /* * This is used by the postmaster in its communication with frontends. It * contains all state information needed during this communication before the * backend is run. The Port structure is kept in malloc'd memory and is * still available when a backend is running (see MyProcPort). The data * it points to must also be malloc'd, or else palloc'd in TopMemoryContext, * so that it survives into PostgresMain execution! * * remote_hostname is set if we did a successful reverse lookup of the * client's IP address during connection setup. * remote_hostname_resolv tracks the state of hostname verification: * +1 = remote_hostname is known to resolve to client's IP address * -1 = remote_hostname is known NOT to resolve to client's IP address * 0 = we have not done the forward DNS lookup yet * -2 = there was an error in name resolution * If reverse lookup of the client IP address fails, remote_hostname will be * left NULL while remote_hostname_resolv is set to -2. If reverse lookup * succeeds but forward lookup fails, remote_hostname_resolv is also set to -2 * (the case is distinguishable because remote_hostname isn't NULL). In * either of the -2 cases, remote_hostname_errcode saves the lookup return * code for possible later use with gai_strerror. */ typedef struct Port { pgsocket sock; /* File descriptor */ bool noblock; /* is the socket in non-blocking mode? */ ProtocolVersion proto; /* FE/BE protocol version */ SockAddr laddr; /* local addr (postmaster) */ SockAddr raddr; /* remote addr (client) */ char *remote_host; /* name (or ip addr) of remote host */ char *remote_hostname;/* name (not ip addr) of remote host, if * available */ int remote_hostname_resolv; /* see above */ char *remote_port; /* text rep of remote port */ CAC_state canAcceptConnections; /* postmaster connection status */ /* * Information that needs to be saved from the startup packet and passed * into backend execution. "char *" fields are NULL if not set. * guc_options points to a List of alternating option names and values. */ char *database_name; char *user_name; char *cmdline_options; List *guc_options; /* * Information that needs to be held during the authentication cycle. */ HbaLine *hba; char md5Salt[4]; /* Password salt */ /* * Information that really has no business at all being in struct Port, * but since it gets used by elog.c in the same way as database_name and * other members of this struct, we may as well keep it here. */ TimestampTz SessionStartTime; /* backend start time */ /* * TCP keepalive settings. * * default values are 0 if AF_UNIX or not yet known; current values are 0 * if AF_UNIX or using the default. Also, -1 in a default value means we * were unable to find out the default (getsockopt failed). */ int default_keepalives_idle; int default_keepalives_interval; int default_keepalives_count; int keepalives_idle; int keepalives_interval; int keepalives_count; #if defined(ENABLE_GSS) || defined(ENABLE_SSPI) /* * If GSSAPI is supported, store GSSAPI information. Otherwise, store a * NULL pointer to make sure offsets in the struct remain the same. */ pg_gssinfo *gss; #else void *gss; #endif /* * SSL structures (keep these last so that USE_SSL doesn't affect * locations of other fields) */ #ifdef USE_SSL SSL *ssl; X509 *peer; char *peer_cn; unsigned long count; #endif /* This field will be in a saner place in 9.4 and up */ int remote_hostname_errcode; /* see above */ } Port; extern ProtocolVersion FrontendProtocol; /* TCP keepalives configuration. These are no-ops on an AF_UNIX socket. */ extern int pq_getkeepalivesidle(Port *port); extern int pq_getkeepalivesinterval(Port *port); extern int pq_getkeepalivescount(Port *port); extern int pq_setkeepalivesidle(int idle, Port *port); extern int pq_setkeepalivesinterval(int interval, Port *port); extern int pq_setkeepalivescount(int count, Port *port); #endif /* LIBPQ_BE_H */