2 * @(#) tcpd.h 1.5 96/03/19 16:22:24
4 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
10 #define TCPD_SOCKADDR struct sockaddr
12 #define TCPD_SOCKADDR struct sockaddr_in
15 #ifndef _STDFILE_DECLARED
16 #define _STDFILE_DECLARED
17 typedef struct __sFILE FILE;
20 /* Structure to describe one communications endpoint. */
22 #define STRING_LENGTH 128 /* hosts, users, processes */
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 */
32 /* Structure to describe what we know about a service request. */
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 */
48 /* Common string operations. Less clutter should be more readable. */
50 #define STRN_CPY(d,s,l) { strncpy((d),(s),(l)); (d)[(l)-1] = 0; }
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)
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".
64 #define STRING_UNKNOWN "unknown" /* lookup failed */
65 #define STRING_PARANOID "paranoid" /* hostname conflict */
67 extern char unknown[];
68 extern char paranoid[];
70 #define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid))
72 #define NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0)
73 #define NOT_INADDR6(s) (strchr(s, ':') == NULL)
75 /* Global functions. */
77 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
78 void fromhost(struct request_info *); /* get/validate client host info */
80 #define fromhost sock_host /* no TLI support needed */
83 int hosts_access(struct request_info *); /* access control */
84 int hosts_ctl(char *, char *, char *, char *); /* wrapper around request_init() */
85 void shell_cmd(char *); /* execute shell command */
86 char *percent_x(char *, int, char *, struct request_info *); /* do %<char> expansion */
87 void rfc931(TCPD_SOCKADDR *, TCPD_SOCKADDR *, char *); /* client name from RFC 931 daemon */
88 void clean_exit(struct request_info *); /* clean up and exit */
89 void refuse(struct request_info *); /* clean up and exit */
90 char *xgets(char *, int, FILE *); /* fgets() on steroids */
92 char *split_at(char *, int); /* strchr() and split */
93 unsigned long dot_quad_addr(char *); /* restricted inet_addr() */
95 /* Global variables. */
97 extern int allow_severity; /* for connection logging */
98 extern int deny_severity; /* for connection logging */
99 extern char *hosts_allow_table; /* for verification mode redirection */
100 extern char *hosts_deny_table; /* for verification mode redirection */
101 extern int hosts_access_verbose; /* for verbose matching mode */
102 extern int rfc931_timeout; /* user lookup timeout */
103 extern int resident; /* > 0 if resident process */
106 * Routines for controlled initialization and update of request structure
107 * attributes. Each attribute has its own key.
110 struct request_info *request_init(struct request_info *,...); /* initialize request */
111 struct request_info *request_set(struct request_info *,...); /* update request structure */
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) */
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.
131 char *eval_user(struct request_info *); /* client user */
132 char *eval_hostname(struct host_info *); /* printable hostname */
133 char *eval_hostaddr(struct host_info *); /* printable host address */
134 char *eval_hostinfo(struct host_info *); /* host name or address */
135 char *eval_client(struct request_info *); /* whatever is available */
136 char *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 */
140 /* Socket-specific methods, including DNS hostname lookups. */
142 void sock_host(struct request_info *); /* look up endpoint addresses */
143 void sock_hostname(struct host_info *); /* translate address to hostname */
144 void sock_hostaddr(struct host_info *); /* address to printable address */
145 #define sock_methods(r) \
146 { (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; }
148 /* The System V Transport-Level Interface (TLI) interface. */
150 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
151 void tli_host(struct request_info *); /* look up endpoint addresses etc. */
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>.
160 void tcpd_warn(char *, ...); /* report problem and proceed */
161 void tcpd_jump(char *, ...); /* report problem and jump */
163 struct tcpd_context {
164 char *file; /* current file */
165 int line; /* current line */
167 extern struct tcpd_context tcpd_context;
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().
176 #define AC_PERMIT 1 /* permit access */
177 #define AC_DENY (-1) /* deny_access */
178 #define AC_ERROR AC_DENY /* XXX */
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
187 void process_options(char *, struct request_info *); /* execute options */
188 extern int dry_run; /* verification flag */
190 /* Bug workarounds. */
192 #ifdef INET_ADDR_BUG /* inet_addr() returns struct */
193 #define inet_addr fix_inet_addr
194 long fix_inet_addr(char *);
197 #ifdef BROKEN_FGETS /* partial reads from sockets */
198 #define fgets fix_fgets
199 char *fix_fgets(char *, int, FILE *);
202 #ifdef RECVFROM_BUG /* no address family info */
203 #define recvfrom fix_recvfrom
204 int fix_recvfrom(int, char *, int, int, struct sockaddr *, int *);
207 #ifdef GETPEERNAME_BUG /* claims success with UDP */
208 #define getpeername fix_getpeername
209 int fix_getpeername(int, struct sockaddr *, int *);
212 #ifdef SOLARIS_24_GETHOSTBYNAME_BUG /* lists addresses as aliases */
213 #define gethostbyname fix_gethostbyname
214 struct hostent *fix_gethostbyname(char *);
217 #ifdef USE_STRSEP /* libc calls strtok() */
218 #define strtok fix_strtok
219 char *fix_strtok(char *, char *);
222 #ifdef LIBC_CALLS_STRTOK /* libc calls strtok() */
223 #define strtok my_strtok
224 char *my_strtok(char *, char *);