release/src/router/apcupsd/include/tcpd.h

   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
   7 /*
   8  * This version of the file has been hacked over by
   9  *   Kern Sibbald to make it compatible with C++ for
  10  *   the few functions that Bacula uses.  19 April 2002
  11  *  It now compiles with C++ but remains untested.
  12  *  A correct fix would require significantly more work.
  13  */
  14
  15 #ifdef __cplusplus
  16 extern "C" {
  17 #endif
  18
  19 /* Structure to describe one communications endpoint. */
  20
  21 #define STRING_LENGTH   128             /* hosts, users, processes */
  22
  23 struct host_info {
  24     char    name[STRING_LENGTH];        /* access via eval_hostname(host) */
  25     char    addr[STRING_LENGTH];        /* access via eval_hostaddr(host) */
  26     struct sockaddr_in *sin;            /* socket address or 0 */
  27     struct t_unitdata *unit;            /* TLI transport address or 0 */
  28     struct request_info *request;       /* for shared information */
  29 };
  30
  31 /* Structure to describe what we know about a service request. */
  32
  33 struct request_info {
  34     int     fd;                         /* socket handle */
  35     char    user[STRING_LENGTH];        /* access via eval_user(request) */
  36     char    daemon[STRING_LENGTH];      /* access via eval_daemon(request) */
  37     char    pid[10];                    /* access via eval_pid(request) */
  38     struct host_info client[1];         /* client endpoint info */
  39     struct host_info server[1];         /* server endpoint info */
  40     void  (*sink) (void);               /* datagram sink function or 0 */
  41     void  (*hostname) (void);           /* address to printable hostname */
  42     void  (*hostaddr) (void);           /* address to printable address */
  43     void  (*cleanup) (void);            /* cleanup function or 0 */
  44     struct netconfig *config;           /* netdir handle */
  45 };
  46
  47 /* Common string operations. Less clutter should be more readable. */
  48
  49 #define STRN_CPY(d,s,l) { strncpy((d),(s),(l)); (d)[(l)-1] = 0; }
  50
  51 #define STRN_EQ(x,y,l)  (strncasecmp((x),(y),(l)) == 0)
  52 #define STRN_NE(x,y,l)  (strncasecmp((x),(y),(l)) != 0)
  53 #define STR_EQ(x,y)     (strcasecmp((x),(y)) == 0)
  54 #define STR_NE(x,y)     (strcasecmp((x),(y)) != 0)
  55
  56  /*
  57   * Initially, all above strings have the empty value. Information that
  58   * cannot be determined at runtime is set to "unknown", so that we can
  59   * distinguish between `unavailable' and `not yet looked up'. A hostname
  60   * that we do not believe in is set to "paranoid".
  61   */
  62
  63 #define STRING_UNKNOWN  "unknown"       /* lookup failed */
  64 #define STRING_PARANOID "paranoid"      /* hostname conflict */
  65
  66 extern char unknown[];
  67 extern char paranoid[];
  68
  69 #define HOSTNAME_KNOWN(s) (STR_NE((s),unknown) && STR_NE((s),paranoid))
  70
  71 #define NOT_INADDR(s) (s[strspn(s,"01234567890./")] != 0)
  72
  73 /* Global functions. */
  74
  75 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
  76 extern void fromhost();                 /* get/validate client host info */
  77 #else
  78 #define fromhost sock_host              /* no TLI support needed */
  79 #endif
  80
  81 extern int hosts_access(struct request_info *); /* access control */
  82 extern void shell_cmd(void);            /* execute shell command */
  83 extern char *percent_x(void);               /* do %<char> expansion */
  84 extern void rfc931(void);                   /* client name from RFC 931 daemon */
  85 extern void clean_exit(void);               /* clean up and exit */
  86 extern void refuse(void);                   /* clean up and exit */
  87 extern char *xgets(void);                   /* fgets() on steroids */
  88 extern char *split_at(void);                /* strchr() and split */
  89 extern unsigned long dot_quad_addr(void);   /* restricted inet_addr() */
  90
  91 /* Global variables. */
  92
  93 extern int allow_severity;              /* for connection logging */
  94 extern int deny_severity;               /* for connection logging */
  95 extern char *hosts_allow_table;         /* for verification mode redirection */
  96 extern char *hosts_deny_table;          /* for verification mode redirection */
  97 extern int hosts_access_verbose;        /* for verbose matching mode */
  98 extern int rfc931_timeout;              /* user lookup timeout */
  99 extern int resident;                    /* > 0 if resident process */
 100
 101  /*
 102   * Routines for controlled initialization and update of request structure
 103   * attributes. Each attribute has its own key.
 104   */
 105
 106 #ifdef __STDC__
 107 extern struct request_info *request_init(struct request_info *,...);
 108 extern struct request_info *request_set(struct request_info *,...);
 109 #else
 110 extern struct request_info *request_init();     /* initialize request */
 111 extern struct request_info *request_set();      /* update request structure */
 112 #endif
 113
 114 #define RQ_FILE         1               /* file descriptor */
 115 #define RQ_DAEMON       2               /* server process (argv[0]) */
 116 #define RQ_USER         3               /* client user name */
 117 #define RQ_CLIENT_NAME  4               /* client host name */
 118 #define RQ_CLIENT_ADDR  5               /* client host address */
 119 #define RQ_CLIENT_SIN   6               /* client endpoint (internal) */
 120 #define RQ_SERVER_NAME  7               /* server host name */
 121 #define RQ_SERVER_ADDR  8               /* server host address */
 122 #define RQ_SERVER_SIN   9               /* server endpoint (internal) */
 123
 124  /*
 125   * Routines for delayed evaluation of request attributes. Each attribute
 126   * type has its own access method. The trivial ones are implemented by
 127   * macros. The other ones are wrappers around the transport-specific host
 128   * name, address, and client user lookup methods. The request_info and
 129   * host_info structures serve as caches for the lookup results.
 130   */
 131
 132 extern char *eval_user(void);               /* client user */
 133 extern char *eval_hostname(void);           /* printable hostname */
 134 extern char *eval_hostaddr(void);           /* printable host address */
 135 extern char *eval_hostinfo(void);           /* host name or address */
 136 extern char *eval_client(struct request_info *); /* whatever is available */
 137 extern char *eval_server(void);             /* whatever is available */
 138 #define eval_daemon(r)  ((r)->daemon)   /* daemon process name */
 139 #define eval_pid(r)     ((r)->pid)      /* process id */
 140
 141 /* Socket-specific methods, including DNS hostname lookups. */
 142
 143 extern void sock_host(struct request_info *);
 144 extern void sock_hostname(void);            /* translate address to hostname */
 145 extern void sock_hostaddr(void);            /* address to printable address */
 146 #define sock_methods(r) \
 147         { (r)->hostname = sock_hostname; (r)->hostaddr = sock_hostaddr; }
 148
 149 /* The System V Transport-Level Interface (TLI) interface. */
 150
 151 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
 152 extern void tli_host();                 /* look up endpoint addresses etc. */
 153 #endif
 154
 155  /*
 156   * Problem reporting interface. Additional file/line context is reported
 157   * when available. The jump buffer (tcpd_buf) is not declared here, or
 158   * everyone would have to include <setjmp.h>.
 159   */
 160
 161 #ifdef __STDC__
 162 extern void tcpd_warn(char *, ...);     /* report problem and proceed */
 163 extern void tcpd_jump(char *, ...);     /* report problem and jump */
 164 #else
 165 extern void tcpd_warn();
 166 extern void tcpd_jump();
 167 #endif
 168
 169 struct tcpd_context {
 170     char   *file;                       /* current file */
 171     int     line;                       /* current line */
 172 };
 173 extern struct tcpd_context tcpd_context;
 174
 175  /*
 176   * While processing access control rules, error conditions are handled by
 177   * jumping back into the hosts_access() routine. This is cleaner than
 178   * checking the return value of each and every silly little function. The
 179   * (-1) returns are here because zero is already taken by longjmp().
 180   */
 181
 182 #define AC_PERMIT       1               /* permit access */
 183 #define AC_DENY         (-1)            /* deny_access */
 184 #define AC_ERROR        AC_DENY         /* XXX */
 185
 186  /*
 187   * In verification mode an option function should just say what it would do,
 188   * instead of really doing it. An option function that would not return
 189   * should clear the dry_run flag to inform the caller of this unusual
 190   * behavior.
 191   */
 192
 193 extern void process_options(void);          /* execute options */
 194 extern int dry_run;                     /* verification flag */
 195
 196 /* Bug workarounds. */
 197
 198 #ifdef INET_ADDR_BUG                    /* inet_addr() returns struct */
 199 #define inet_addr fix_inet_addr
 200 extern long fix_inet_addr(void);
 201 #endif
 202
 203 #ifdef BROKEN_FGETS                     /* partial reads from sockets */
 204 #define fgets fix_fgets
 205 extern char *fix_fgets(void);
 206 #endif
 207
 208 #ifdef RECVFROM_BUG                     /* no address family info */
 209 #define recvfrom fix_recvfrom
 210 extern int fix_recvfrom(void);
 211 #endif
 212
 213 #ifdef GETPEERNAME_BUG                  /* claims success with UDP */
 214 #define getpeername fix_getpeername
 215 extern int fix_getpeername(void);
 216 #endif
 217
 218 #ifdef SOLARIS_24_GETHOSTBYNAME_BUG     /* lists addresses as aliases */
 219 #define gethostbyname fix_gethostbyname
 220 extern struct hostent *fix_gethostbyname(void);
 221 #endif
 222
 223 #ifdef USE_STRSEP                       /* libc calls strtok(void) */
 224 #define strtok  fix_strtok
 225 extern char *fix_strtok(void);
 226 #endif
 227
 228 #ifdef LIBC_CALLS_STRTOK                /* libc calls strtok() */
 229 #define strtok  my_strtok
 230 extern char *my_strtok(void);
 231 #endif
 232
 233 #ifdef __cplusplus
 234 }
 235 #endif