1 /* 2 * @(#) tcpd.h 1.5 96/03/19 16:22:24 3 * 4 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. 5 * 6 * $FreeBSD$ 7 */ 8 9#ifdef INET6 10#define TCPD_SOCKADDR struct sockaddr 11#else 12#define TCPD_SOCKADDR struct sockaddr_in 13#endif 14 15#ifndef _STDFILE_DECLARED 16#define _STDFILE_DECLARED 17typedef struct __sFILE FILE; 18#endif 19 20/* Structure to describe one communications endpoint. */ 21 22#define STRING_LENGTH 128 /* hosts, users, processes */ 23 24struct host_info { 25 char name[STRING_LENGTH]; /* access via eval_hostname(host) */ 26 char addr[STRING_LENGTH]; /* access via eval_hostaddr(host) */ 27 TCPD_SOCKADDR *sin; /* socket address or 0 */ 28 struct t_unitdata *unit; /* TLI transport address or 0 */ 29 struct request_info *request; /* for shared information */ 30}; 31 32/* Structure to describe what we know about a service request. */ 33 34struct request_info { 35 int fd; /* socket handle */ 36 char user[STRING_LENGTH]; /* access via eval_user(request) */ 37 char daemon[STRING_LENGTH]; /* access via eval_daemon(request) */ 38 char pid[10]; /* access via eval_pid(request) */ 39 struct host_info client[1]; /* client endpoint info */ 40 struct host_info server[1]; /* server endpoint info */ 41 void (*sink) (int); /* datagram sink function or 0 */ 42 void (*hostname) (struct host_info *); /* address to printable hostname */ 43 void (*hostaddr) (struct host_info *); /* address to printable address */ 44 void (*cleanup) (struct request_info *); /* cleanup function or 0 */ 45 struct netconfig *config; /* netdir handle */ 46}; 47 48/* Common string operations. Less clutter should be more readable. */ 49 50#define STRN_CPY(d,s,l) { strncpy((d),(s),(l)); (d)[(l)-1] = 0; } 51 52#define STRN_EQ(x,y,l) (strncasecmp((x),(y),(l)) == 0) 53#define STRN_NE(x,y,l) (strncasecmp((x),(y),(l)) != 0) 54#define STR_EQ(x,y) (strcasecmp((x),(y)) == 0) 55#define STR_NE(x,y) (strcasecmp((x),(y)) != 0) 56 57 /* 58 * Initially, all above strings have the empty value. Information that 59 * cannot be determined at runtime is set to "unknown", so that we can 60 * distinguish between `unavailable' and `not yet looked up'. A hostname 61 * that we do not believe in is set to "paranoid". 62 */ 63 64#define STRING_UNKNOWN "unknown" /* lookup failed */ 65#define STRING_PARANOID "paranoid" /* hostname conflict */ 66 67extern char unknown[]; 68extern char paranoid[]; 69 70#define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid)) 71 72#define NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0) 73#define NOT_INADDR6(s) (strchr(s, ':') == NULL) 74 75/* Global functions. */ 76 77#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT) 78void fromhost(struct request_info *); /* get/validate client host info */ 79#else 80#define fromhost sock_host /* no TLI support needed */ 81#endif 82 83int hosts_access(struct request_info *); /* access control */ 84int hosts_ctl(char *, char *, char *, char *); /* wrapper around request_init() */ 85void shell_cmd(char *); /* execute shell command */ 86char *percent_x(char *, int, char *, struct request_info *); /* do %<char> expansion */ 87void rfc931(TCPD_SOCKADDR *, TCPD_SOCKADDR *, char *); /* client name from RFC 931 daemon */ 88void clean_exit(struct request_info *); /* clean up and exit */ 89void refuse(struct request_info *); /* clean up and exit */ 90char *xgets(char *, int, FILE *); /* fgets() on steroids */ 91 92char *split_at(char *, int); /* strchr() and split */ 93unsigned long dot_quad_addr(char *); /* restricted inet_addr() */ 94 95/* Global variables. */ 96 97extern int allow_severity; /* for connection logging */ 98extern int deny_severity; /* for connection logging */ 99extern char *hosts_allow_table; /* for verification mode redirection */ 100extern char *hosts_deny_table; /* for verification mode redirection */ 101extern int hosts_access_verbose; /* for verbose matching mode */ 102extern int rfc931_timeout; /* user lookup timeout */ 103extern int resident; /* > 0 if resident process */ 104 105 /* 106 * Routines for controlled initialization and update of request structure 107 * attributes. Each attribute has its own key. 108 */ 109 110struct request_info *request_init(struct request_info *,...); /* initialize request */ 111struct request_info *request_set(struct request_info *,...); /* update request structure */ 112 113#define RQ_FILE 1 /* file descriptor */ 114#define RQ_DAEMON 2 /* server process (argv[0]) */ 115#define RQ_USER 3 /* client user name */ 116#define RQ_CLIENT_NAME 4 /* client host name */ 117#define RQ_CLIENT_ADDR 5 /* client host address */ 118#define RQ_CLIENT_SIN 6 /* client endpoint (internal) */ 119#define RQ_SERVER_NAME 7 /* server host name */ 120#define RQ_SERVER_ADDR 8 /* server host address */ 121#define RQ_SERVER_SIN 9 /* server endpoint (internal) */ 122 123 /* 124 * Routines for delayed evaluation of request attributes. Each attribute 125 * type has its own access method. The trivial ones are implemented by 126 * macros. The other ones are wrappers around the transport-specific host 127 * name, address, and client user lookup methods. The request_info and 128 * host_info structures serve as caches for the lookup results. 129 */ 130 131char *eval_user(struct request_info *); /* client user */ 132char *eval_hostname(struct host_info *); /* printable hostname */ 133char *eval_hostaddr(struct host_info *); /* printable host address */ 134char *eval_hostinfo(struct host_info *); /* host name or address */ 135char *eval_client(struct request_info *); /* whatever is available */ 136char *eval_server(struct request_info *); /* whatever is available */ 137#define eval_daemon(r) ((r)->daemon) /* daemon process name */ 138#define eval_pid(r) ((r)->pid) /* process id */ 139 140/* Socket-specific methods, including DNS hostname lookups. */ 141 142void sock_host(struct request_info *); /* look up endpoint addresses */ 143void sock_hostname(struct host_info *); /* translate address to hostname */ 144void sock_hostaddr(struct host_info *); /* address to printable address */ 145#define sock_methods(r) \ 146 { (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; } 147 148/* The System V Transport-Level Interface (TLI) interface. */ 149 150#if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT) 151void tli_host(struct request_info *); /* look up endpoint addresses etc. */ 152#endif 153 154 /* 155 * Problem reporting interface. Additional file/line context is reported 156 * when available. The jump buffer (tcpd_buf) is not declared here, or 157 * everyone would have to include <setjmp.h>. 158 */ 159 160void tcpd_warn(char *, ...); /* report problem and proceed */ 161void tcpd_jump(char *, ...); /* report problem and jump */ 162 163struct tcpd_context { 164 char *file; /* current file */ 165 int line; /* current line */ 166}; 167extern struct tcpd_context tcpd_context; 168 169 /* 170 * While processing access control rules, error conditions are handled by 171 * jumping back into the hosts_access() routine. This is cleaner than 172 * checking the return value of each and every silly little function. The 173 * (-1) returns are here because zero is already taken by longjmp(). 174 */ 175 176#define AC_PERMIT 1 /* permit access */ 177#define AC_DENY (-1) /* deny_access */ 178#define AC_ERROR AC_DENY /* XXX */ 179 180 /* 181 * In verification mode an option function should just say what it would do, 182 * instead of really doing it. An option function that would not return 183 * should clear the dry_run flag to inform the caller of this unusual 184 * behavior. 185 */ 186 187void process_options(char *, struct request_info *); /* execute options */ 188extern int dry_run; /* verification flag */ 189 190/* Bug workarounds. */ 191 192#ifdef INET_ADDR_BUG /* inet_addr() returns struct */ 193#define inet_addr fix_inet_addr 194long fix_inet_addr(char *); 195#endif 196 197#ifdef BROKEN_FGETS /* partial reads from sockets */ 198#define fgets fix_fgets 199char *fix_fgets(char *, int, FILE *); 200#endif 201 202#ifdef RECVFROM_BUG /* no address family info */ 203#define recvfrom fix_recvfrom 204int fix_recvfrom(int, char *, int, int, struct sockaddr *, int *); 205#endif 206 207#ifdef GETPEERNAME_BUG /* claims success with UDP */ 208#define getpeername fix_getpeername 209int fix_getpeername(int, struct sockaddr *, int *); 210#endif 211 212#ifdef SOLARIS_24_GETHOSTBYNAME_BUG /* lists addresses as aliases */ 213#define gethostbyname fix_gethostbyname 214struct hostent *fix_gethostbyname(char *); 215#endif 216 217#ifdef USE_STRSEP /* libc calls strtok() */ 218#define strtok fix_strtok 219char *fix_strtok(char *, char *); 220#endif 221 222#ifdef LIBC_CALLS_STRTOK /* libc calls strtok() */ 223#define strtok my_strtok 224char *my_strtok(char *, char *); 225#endif 226