1: #ifndef lint
   2: static char *sccsid = "@(#)access.c	1.4	(Berkeley) 3/12/86";
   3: #endif
   4: 
   5: #include "common.h"
   6: #include <sys/socket.h>
   7: #include <netinet/in.h>
   8: #include <arpa/inet.h>
   9: #include <netdb.h>
  10: 
  11: /*
  12:  * host_access -- determine if the client has permission to
  13:  *	read, transfer, and/or post news.  read->transfer.
  14:  *
  15:  *	Parameters:	"read" is a pointer to storage for
  16:  *			an integer, which we set to 1 if the
  17:  *			client can read news, 0 otherwise.
  18:  *
  19:  *			"post" is a pointer to storage for
  20:  *			an integer,which we set to 1 if the
  21:  *			client can post news, 0 otherwise.
  22:  *
  23:  *	Returns:	Nothing.
  24:  *
  25:  *	Side effects:	None.
  26:  */
  27: 
  28: #ifdef LOG
  29: char    hostname[256];
  30: #endif
  31: 
  32: host_access(canread, canpost, canxfer)
  33: int *canread, *canpost, *canxfer;
  34: {
  35:     char        hostornet[MAX_STRLEN];
  36:     char        readperm[MAX_STRLEN], postperm[MAX_STRLEN];
  37:     char        host_name[MAX_STRLEN], net_name[MAX_STRLEN];
  38:     char        line[MAX_STRLEN];
  39:     char        *cp;
  40:     int     ncanread, ncanpost, ncanxfer;
  41:     int     netmatch;
  42:     int     count, sockt, length;
  43:     unsigned long   net_addr;
  44:     struct netent   *np;
  45:     struct sockaddr_in sin;
  46:     struct hostent  *hp;
  47:     FILE        *acs_fp;
  48: 
  49:     *canread = *canpost = *canxfer = 0;
  50: 
  51:     sockt = fileno(stdin);
  52:     length = sizeof (struct sockaddr_in);
  53: #ifdef DEBUG
  54:     *canread = *canpost = *canxfer = 1;
  55:     return;
  56: #endif
  57: 
  58:     if (getpeername(sockt, (struct sockaddr *) &sin, &length) < 0) {
  59:         if (isatty(sockt)) {
  60: #ifdef LOG
  61:             (void) strcpy(hostname, "stdin");
  62: #endif
  63:             *canread = 1;
  64:         } else {
  65:             syslog(LOG_ERR, "host_access: getpeername: %m");
  66: #ifdef LOG
  67:             (void) strcpy(hostname, "unknown");
  68: #endif
  69:         }
  70:         return;
  71:     }
  72: 
  73:     /*
  74: 	 * At this point, sin.sin_addr.s_addr is the address of
  75: 	 * the host in network order.
  76: 	 */
  77: 
  78:     net_addr = inet_netof(sin.sin_addr);    /* net_addr in host order */
  79: 
  80:     np = getnetbyaddr(net_addr, AF_INET);
  81:     if (np != NULL)
  82:         (void) strcpy(net_name, np->n_name);
  83:     else
  84:         (void) strcpy(net_name,inet_ntoa(*(struct in_addr *)&net_addr));
  85: 
  86:     hp = gethostbyaddr((char *) &sin.sin_addr.s_addr, sizeof(long),
  87:         AF_INET);
  88:     if (hp != NULL)
  89:         (void) strcpy(host_name, hp->h_name);
  90:     else
  91:         (void) strcpy(host_name, inet_ntoa(sin.sin_addr));
  92: 
  93: #ifdef LOG
  94:     syslog(LOG_INFO, "%s connect\n", host_name);
  95:     (void) strcpy(hostname, host_name);
  96: #endif
  97: 
  98:     /*
  99: 	 * So, now we have host_name and net_name.
 100: 	 * Our strategy at this point is:
 101: 	 *
 102: 	 * for each line, get the first word
 103: 	 *
 104: 	 *	If it matches "host_name", we have a direct
 105: 	 *		match; parse and return.
 106: 	 *
 107: 	 *	If it matches "net_name", we have a net match;
 108: 	 *		parse and set flags.
 109: 	 *
 110: 	 *	If it matches the literal "default", note we have
 111: 	 *		a net match; parse.
 112: 	 */
 113: 
 114:     acs_fp = fopen(ACCESS_FILE, "r");
 115:     if (acs_fp == NULL)
 116:         return;
 117: 
 118:     while (fgets(line, sizeof(line), acs_fp) != NULL) {
 119:         if ((cp = index(line, '\n')) != NULL)
 120:             *cp = '\0';
 121:         if ((cp = index(line, '#')) != NULL)
 122:             *cp = '\0';
 123:         if (*line == '\0')
 124:             continue;
 125: 
 126:         count = sscanf(line, "%s %s %s", hostornet, readperm, postperm);
 127: 
 128:         if (count < 3)
 129:             continue;
 130: 
 131:         if (strcmp(hostornet, host_name) == 0) {
 132:             *canread = (readperm[0] == 'r' || readperm[0] == 'R');
 133:             *canxfer = (*canread || readperm[0] == 'X'
 134:                          || readperm[0] == 'x');
 135:             *canpost = (postperm[0] == 'p' || postperm[0] == 'P');
 136:             (void) fclose(acs_fp);
 137:             return;
 138:         }
 139: 
 140:         if (strcmp(hostornet, net_name) == 0 ||
 141:             strcmp(hostornet, "default") == 0) {
 142:             netmatch = 1;
 143:             ncanread = (readperm[0] == 'r' || readperm[0] == 'R');
 144:             ncanxfer = (ncanread || readperm[0] == 'X'
 145:                          || readperm[0] == 'x');
 146:             ncanpost = (postperm[0] == 'p' || postperm[0] == 'P');
 147:         }
 148:     }
 149: 
 150:     (void) fclose(acs_fp);
 151: 
 152:     if (netmatch) {
 153:         *canread = ncanread;
 154:         *canpost = ncanpost;
 155:         *canxfer = ncanxfer;
 156:     }
 157: }

Defined functions

host_access defined in line 32; used 1 times

Defined variables

sccsid defined in line 2; never used
Last modified: 1986-03-21
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