4.3BSD - /usr/src/usr.lib/sendmail/aux/bbn_daemon.c

   1: # include <errno.h>
   2: # include "sendmail.h"
   3: 
   4: #ifndef DAEMON
   5: SCCSID(@(#)bbn_daemon.c	3.36+		12/13/82	(w/o daemon mode));
   6: #else
   7: SCCSID(@(#)bbn_daemon.c	3.36+		12/13/82	(w/ daemon mode));
   8: 
   9: /*
  10: **  DAEMON.C -- routines to use when running as a daemon.
  11: **
  12: **	BB&N Version.  Hack attack!!  This version is not supported,
  13: **	and probably has some bugs......
  14: **
  15: **	Basic semantics are:
  16: **
  17: **	getrequests()
  18: **		Opens a port and initiates a connection.
  19: **		Returns in a child.  Must set InChannel and
  20: **		OutChannel appropriately.
  21: **	makeconnection(host, port, outfile, infile)
  22: **		Make a connection to the named host on the given
  23: **		port.  Set *outfile and *infile to the files
  24: **		appropriate for communication.  Returns zero on
  25: **		success, else an exit status describing the
  26: **		error.
  27: **
  28: **	The semantics of both of these should be clean.
  29: */
  30: 
  31: #include "netlib.h"
  32: #include "con.h"
  33: #include <wait.h>
  34: 
  35: #define SMTPSOCK    25
  36: /*
  37: **  GETREQUESTS -- open mail IPC port and get requests.
  38: **
  39: **	Parameters:
  40: **		none.
  41: **
  42: **	Returns:
  43: **		none.
  44: **
  45: **	Side Effects:
  46: **		Waits until some interesting activity occurs.  When
  47: **		it does, a child is created to process it, and the
  48: **		parent waits for completion.  Return from this
  49: **		routine is always in the child.
  50: */
  51: 
  52: getrequests()
  53: {
  54:     int t;
  55:     int iretval;
  56:     union wait status;
  57:     struct con openparams;
  58: 
  59:     /*
  60: 	**  Set up the address for the mailer.
  61: 	*/
  62: 
  63:     bzero (&openparams, sizeof openparams); /* clear out the structure */
  64: 
  65: 
  66:     openparams.c_mode = CONTCP;
  67:     openparams.c_lport = SMTPSOCK;
  68:     openparams.c_rbufs = 2;     /* 2k receive buffer */
  69: 
  70:     /*
  71: 	**  Try to actually open the connection.
  72: 	*/
  73: 
  74: # ifdef DEBUG
  75:     if (tTd(15, 1))
  76:         printf("getrequests\n");
  77: # endif DEBUG
  78: 
  79:     for (;;)
  80:     {
  81:         /* wait for a connection */
  82:         register int pid;
  83: 
  84:         do
  85:         {
  86:             errno = 0;
  87:             t = open("/dev/net/net", &openparams);
  88:         } while (t < 0 && errno == EINTR);
  89:         if (t < 0)
  90:         {
  91:             syserr("getrequests: open");
  92:             sleep(500);
  93:             continue;
  94:         }
  95: 
  96: 
  97:         /* set 'eol' mode in connection */
  98: 
  99:         ioctl (t, NETSETE, 0);
 100: 
 101:         /*
 102: 		**  Create a subprocess to process the mail.
 103: 		*/
 104: 
 105: # ifdef DEBUG
 106:         if (tTd(15, 2))
 107:             printf("getrequests: forking (fd = %d)\n", t);
 108: # endif DEBUG
 109: 
 110:         pid = fork();
 111:         if (pid < 0)
 112:         {
 113:             syserr("daemon: cannot fork");
 114:             sleep(10);
 115:             (void) close(t);
 116:             continue;
 117:         }
 118: 
 119:         if (pid == 0)
 120:         {
 121:             /*
 122: 			**  CHILD -- return to caller.
 123: 			**	Verify calling user id if possible here.
 124: 			*/
 125: 
 126:             InChannel = fdopen(t, "r");
 127:             OutChannel = fdopen(t, "w");
 128: # ifdef DEBUG
 129:             if (tTd(15, 2))
 130:                 printf("getreq: returning\n");
 131: # endif DEBUG
 132: # ifdef LOG
 133:             if (LogLevel > 11)
 134:                 syslog(LOG_DEBUG, "connected, pid=%d", getpid());
 135: # endif LOG
 136:             return;
 137:         }
 138: 
 139:         /*
 140: 		**  PARENT -- wait for child to terminate.
 141: 		**	Perhaps we should allow concurrent processing?
 142: 		*/
 143: 
 144: # ifdef DEBUG
 145:         if (tTd(15, 2))
 146:         {
 147:             sleep(2);
 148:             printf("getreq: parent waiting\n");
 149:         }
 150: # endif DEBUG
 151: 
 152:         /* close the port so that others will hang (for a while) */
 153:         if ((iretval = close(t)) < 0)
 154:             syserr("getreq:  cannot close port 25:  %d", iretval) ;
 155: 
 156: 
 157:         /* pick up old zombies; implement load limiting */
 158:         while (wait3(&status, WNOHANG, 0) > 0)
 159:             continue;
 160:     }
 161: }
 162: /*
 163: **  MAKECONNECTION -- make a connection to an SMTP socket on another machine.
 164: **
 165: **	Parameters:
 166: **		host -- the name of the host.
 167: **		port -- the port number to connect to.
 168: **		outfile -- a pointer to a place to put the outfile
 169: **			descriptor.
 170: **		infile -- ditto for infile.
 171: **
 172: **	Returns:
 173: **		An exit code telling whether the connection could be
 174: **			made and if not why not.
 175: **
 176: **	Side Effects:
 177: **		none.
 178: */
 179: 
 180: makeconnection(host, port, outfile, infile)
 181:     char *host;
 182:     u_short port;
 183:     FILE **outfile;
 184:     FILE **infile;
 185: {
 186:     register int s;
 187:     struct con openparams;
 188: 
 189:     bzero (&openparams, sizeof openparams); /* clear structure's memory */
 190: 
 191:     openparams.c_mode = CONACT | CONTCP;
 192:     openparams.c_timeo = 60;
 193: 
 194:     /*
 195: 	**  Set up the address for the mailer.
 196: 	**	Accept "[a.b.c.d]" syntax for host name.
 197: 	*/
 198: 
 199:     if (host[0] == '[')
 200:     {
 201:         long hid = 0;
 202:         int i, j;
 203:         register char *p = host;
 204: 
 205:         for (i = 3; i >= 0 && *p != ']' && *p != '\0'; i--)
 206:         {
 207:             j = 0;
 208:             while (isdigit(*++p))
 209:                 j = j * 10 + (*p - '0');
 210:             if (*p != (i == 0 ? ']' : '.') || j > 255 || j < 0)
 211:                 break;
 212:             hid |= j << ((3 - i) * 8);
 213:         }
 214:         if (i >= 0 || *p != ']' || *++p != '\0')
 215:         {
 216:             usrerr("Invalid numeric domain spec \"%s\"", host);
 217:             return (EX_NOHOST);
 218:         }
 219:         openparams.c_fcon._na_l = hid;
 220:     }
 221:     else
 222:     {
 223: 
 224:         openparams.c_fcon = gethost(host);
 225:         if (isbadhost(openparams.c_fcon))
 226:             return (EX_NOHOST);
 227:     }
 228: 
 229:     /*
 230: 	**  Determine the port number.
 231: 	*/
 232: 
 233:     if (port == 0)
 234:         openparams.c_fport = SMTPSOCK;
 235:     else
 236:         openparams.c_fport = port;
 237: 
 238:     /*
 239: 	**  Try to actually open the connection.
 240: 	*/
 241: 
 242: # ifdef DEBUG
 243:     if (tTd(16, 1))
 244:         printf("makeconnection(%s=%X)\n", host, openparams.c_fcon._na_l);
 245: # endif DEBUG
 246: 
 247:     s = open("/dev/net/net", &openparams);
 248: 
 249: # ifdef DEBUG
 250:     if (tTd(16, 1))
 251:         printf("makeconnection: %d\n", s);
 252: # endif DEBUG
 253: 
 254:     if (s < 0)
 255:         return (EX_TEMPFAIL);
 256: 
 257:     /* connection ok, put it into canonical form */
 258:     *outfile = fdopen(s, "w");
 259:     *infile = fdopen(s, "r");
 260: 
 261:     return (0);
 262: }
 263: 
 264: # endif DAEMON
 265: /*
 266: **  MYHOSTNAME -- return the name of this host.
 267: **
 268: **	This is a hideous hack....  It should be fixed to really work
 269: **	under the BB&N code.  However, since Brendan's configuration
 270: **	tables don't use this feature it won't matter.
 271: **
 272: **	Parameters:
 273: **		hostbuf -- a place to return the name of this host.
 274: **		size -- the size of hostbuf.
 275: **
 276: **	Returns:
 277: **		A list of aliases for this host.
 278: **		NULL if it cannot be found.
 279: **
 280: **	Side Effects:
 281: **		none.
 282: */
 283: 
 284: char **
 285: myhostname(hostbuf, size)
 286:     char hostbuf[];
 287:     int size;
 288: {
 289:     register FILE *f;
 290: 
 291:     hostbuf[0] = '\0';
 292:     f = fopen("/usr/include/whoami", "r");
 293:     if (f != NULL)
 294:     {
 295:         (void) fgets(hostbuf, size, f);
 296:         fixcrlf(hostbuf, TRUE);
 297:         (void) fclose(f);
 298:     }
 299:     return (NULL);
 300: }

Defined functions

Defined macros