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Annotation of 40BSD/cmd/berknet/mmail.c, revision 1.1

1.1     ! root        1: # include "defs.h"
        !             2: /*
        !             3:    Mmail is a berkeley network internal command.
        !             4:    It is executed locally by the mwrite command,
        !             5:    and from a remote machine by the sendberkmail command.
        !             6:    Its purpose is to send mail to a user on this
        !             7:    machine using the system mail program.
        !             8: 
        !             9: Archaic Usage:
        !            10: 
        !            11:    mmail [-commandsent -timesent] fromuser frommach touser
        !            12: 
        !            13: Correct Usage:
        !            14:    mmail [-c commandsent] [-e timesent] [-f fromaddress] [-t toaddress] 
        !            15:        [-h hopcnt] [-r rc] [-z]
        !            16: 
        !            17:    The mwrite command uses all the options.
        !            18:    The sendberkmail command does not use the commandsend, timesent and rc 
        !            19:    options.
        !            20:    Timesent is time in seconds since 1901 in decimal, as returned by time().
        !            21:    Frommach is a multi-character name, not a single letter.
        !            22:    Rc is the return code (exit code>>8) of the command.
        !            23: 
        !            24: Assumptions about the system mail command:
        !            25: 1. We assume there is an optional argument "-r" which can be added to mail.
        !            26:    Mail argument format (two choices):
        !            27: 
        !            28:        mail -r fromaddress toaddress
        !            29: 
        !            30:    which becomes mail from "fromaddress" instead of "network".
        !            31: 
        !            32: 2. We assume that mail accepts the "-h hopcnt" flag, and passes it thru
        !            33:    unchanged to the sendberkmail program.  The hopcnt is incremented everytime
        !            34:    it passes thru mmail, so inifinite mail forwarding is detected.
        !            35:    Since both the from and to addresses cycle, it there is infinite looping
        !            36:    we simply mail to root to that effect and throw away the mail.
        !            37: 
        !            38: 
        !            39:    If this argument scheme looks flakey it is because I screwed up
        !            40:    in the argument design.  With the network now up to 10 machines,
        !            41:    I can't add another parameter to the internal commands of the network
        !            42:    like mmail and mwrite.  If I had used labeled parms instead of
        !            43:    positional parms, I would be able to add more options/info
        !            44:    without having to recompile all code...
        !            45: 
        !            46:    exit codes:
        !            47:        normally returns the exit code from the mail program
        !            48: 
        !            49: */
        !            50: main(argc,argv)
        !            51:   char **argv; {
        !            52:        int n, ret, i, hopcnt = 0, pid;
        !            53:        char *sargv[20], *cmdstr=NULL, buf[BUFSIZ], *timestr, 
        !            54:                fromaddress[BUFSIZ];
        !            55:        char toaddress[BUFSIZ], src[20], snFrom[BUFSIZ], snto[BUFSIZ],
        !            56:                mchFrom, mchto, stemp[BUFSIZ], fisresponse = 0;
        !            57:        long timesent = TIMEBASE, el;
        !            58:        FILE *fdm;
        !            59: 
        !            60:        debugflg = DBV;
        !            61:        src[0] = 0;
        !            62: 
        !            63:        /* parse old format positional parms */
        !            64:        if(argv[1][0] == '-'){
        !            65:                cmdstr = argv[1] + 1;
        !            66:                timesent = atol(argv[2] + 1);
        !            67:                sprintf(fromaddress,"%s:%s",argv[4],argv[3]);
        !            68:                strcpy(toaddress,argv[5]);
        !            69:        }
        !            70:        else {
        !            71:                sprintf(fromaddress,"%s:%s",argv[2],argv[1]);
        !            72:                strcpy(toaddress,argv[3]);
        !            73:        }
        !            74:        argv[argc] = 0;
        !            75: 
        !            76:        /* parse labeled parameters */
        !            77:        /*  prob because of -cmd in arg1 and arg2 */
        !            78:        for(i = 1; i < argc; i++){
        !            79:                if(argv[i][0] == '-' && argv[i][2] == 0)
        !            80:                switch(argv[i][1]){
        !            81:                case 'f': 
        !            82:                        strcpy(fromaddress,argv[++i]);
        !            83:                        break;
        !            84:                case 'c': 
        !            85:                        cmdstr = argv[++i];
        !            86:                        break;
        !            87:                case 'e':
        !            88:                        timesent = atol(argv[++i]);
        !            89:                        break;
        !            90:                case 't':
        !            91:                        strcpy(toaddress,argv[++i]);
        !            92:                        break;
        !            93:                case 'h':
        !            94:                        hopcnt = atoi(argv[++i]);
        !            95:                        break;
        !            96:                case 'r':
        !            97:                        strcpy(src,argv[++i]);
        !            98:                        break;
        !            99:                case 'z':
        !           100:                        fisresponse++;
        !           101:                        break;
        !           102:                /* it is important there be no error if an unknown
        !           103:                   flag is encountered */
        !           104:                }
        !           105:        }
        !           106:        mchFrom = MchSFromAddr(snFrom,fromaddress);
        !           107: 
        !           108:        /* compute time send */
        !           109:        timestr = ctime(&timesent);
        !           110:        timestr[strlen(timestr) - 6] = 0;
        !           111:        el = gettime() - timesent;
        !           112: 
        !           113:        /* check the hopcnt */
        !           114:        hopcnt++;
        !           115:        if(hopcnt > MAXHOPS)hopcnterr(toaddress, hopcnt);
        !           116: 
        !           117:        /* analyze the dest, if local, strip off mach name, otherwise ok */
        !           118:        mchto = MchSFromAddr(snto,toaddress);
        !           119:        if(mchto == local)strcpy(toaddress,snto);
        !           120: 
        !           121:        /* it is important to realize that mmail is executed
        !           122:           either as root, network, or the USER!
        !           123:           So the -r option must be accepted (and possibly ignored)
        !           124:           by the mail program if the user is a reandom user. 
        !           125:        */
        !           126:        /* now we fork off a mail command. if fisresponse, then
        !           127:        we are "cautious" and don't use mail forwarders */
        !           128: 
        !           129:        fdm = mailopen(toaddress, fromaddress, fisresponse, hopcnt);
        !           130:        if(cmdstr != NULL){
        !           131:                if(src[0] != 0)sprintf(stemp,", R: %s", src);
        !           132:                else stemp[0] = 0;
        !           133:                fprintf(fdm,"Subject: \"%s\"%s, sent %s, took %s\n",
        !           134:                        cmdstr,stemp,timestr,comptime(el));
        !           135:        }
        !           136:        while((n = fread(buf,1,BUFSIZ,stdin)) > 0)
        !           137:                fwrite(buf,1,n,fdm);
        !           138:        ret = mailclose(fdm);
        !           139:        ret >>= 8;
        !           140:        if(ret != 0)
        !           141:                fprintf(stderr,
        !           142:                "Non-zero return code (%d) from the mail program.\n",ret);
        !           143:        exit(ret);
        !           144:        }
        !           145: /*
        !           146:        hopcnterr()
        !           147: 
        !           148:        there appears to be infinite mail forwarding -
        !           149:        as detected by the hop count.  Mail to root and give up.
        !           150:        Both the from and to addresses are cycling, so mail 
        !           151:        can't be sent there.
        !           152: */
        !           153: hopcnterr(toaddress,hopcnt)
        !           154:        char *toaddress;
        !           155:        int hopcnt;
        !           156: {
        !           157:        char cmdstr[BUFSIZ];
        !           158:        int rcode;
        !           159:        sprintf(cmdstr,"echo infinite mail loop for %s hops %d | mail root",
        !           160:                toaddress,hopcnt);
        !           161:        rcode = system(cmdstr);
        !           162:        exit(EX_OSERR);
        !           163:        /*UNREACHED*/
        !           164: }

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