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

1.1     ! root        1: /*
        !             2:        Mwrite provides the "response" function in the network.
        !             3:        It sends its standard input to "toaddress", either by opening
        !             4:        his terminal and writing on it, or by mailing it to him.
        !             5:        It is executed by a remote machine from netdameon.c, either for a 
        !             6:        response to be sent back or an errormsg to be sent back.
        !             7:        It excutes mmail locally if it needs to.
        !             8: 
        !             9: Archaic Usage:
        !            10:        mwrite toaddress ttystr lutmptime fmach fuser [command ltimeSent]
        !            11: 
        !            12: New Usage:
        !            13:        mwrite [-t toaddress] [-f fromaddress] [-x lutmptime]
        !            14:                [-c command] [-y ttystr] [-e ltimeSent] [-r rc]
        !            15:        
        !            16:        fmach is a single letter.
        !            17:        ttystr is the full name, e.g. /dev/tty0
        !            18:        ltimeSent is number of secs since TIMEBASE in decimal.
        !            19:        lutmptime is the login time from utmp in OCTAL in the old protocol
        !            20:        and in decimal in the new protocol.
        !            21:        rc is the decimal return code (exit code>>8) of the command.
        !            22:        command and ltimeSent are optional.
        !            23: 
        !            24:        There is duplication in this argument list.
        !            25:        See the note in mmail.c about this stuff.
        !            26: 
        !            27:        Mwrite must be setuid bin or setuid root, to get in group 0,
        !            28:        on the CC machines, in order to write on the user's terminal.
        !            29: 
        !            30:        Exit Codes:
        !            31:                Returns 0 if the writing on the terminal works.
        !            32:                Returns the return code of the mmail program if this is mailed.
        !            33: */
        !            34: # include "defs.h"
        !            35: jmp_buf env;
        !            36: main(argc,argv)
        !            37:   char **argv; {
        !            38:        long lutmptime, otime, ltimeSent, ltimeCur, ltimeElap;
        !            39:        int alarmint();
        !            40:        FILE *file;
        !            41:        int i;
        !            42:        struct utmp *putmp;
        !            43:        char buf[BUFSIZ],*s;
        !            44:        char fromaddress[BUFSIZ], toaddress[BUFSIZ];
        !            45:        char ttynamestr[BUFSIZ], cmdstr[BUFSIZ], *stimeCur, stimeSent[20];
        !            46:        char src[10], stemp[BUFSIZ];
        !            47:        struct stat statbuf;
        !            48: 
        !            49:        debugflg = DBV;
        !            50:        argv[argc] = 0;
        !            51:        otime = 0;
        !            52:        src[0] = 0;
        !            53:        errno = 0;
        !            54: 
        !            55:        /*
        !            56:        NO LONGER NEEDED
        !            57:        strcpy(toaddress,argv[1]);
        !            58:        strcpy(ttynamestr,argv[2]);
        !            59:        sscanf(argv[3],"%lo",&lutmptime);
        !            60:        sprintf(fromaddress,"%s:%s",longname(argv[4][0]),argv[5]);
        !            61:        if(argc > 6)strcpy(cmdstr,argv[6]);
        !            62:        else cmdstr[0] = 0;
        !            63:        if(argc > 7)strcpy(stimeSent,argv[7]);
        !            64:        else stimeSent[0] = 0;
        !            65:        */
        !            66: 
        !            67:        /* parse arguments */
        !            68:        for(i = 1; i < argc; i++){
        !            69:                if(argv[i][0] == '-')
        !            70:                switch(argv[i][1]){
        !            71:                case 't':
        !            72:                        strcpy(toaddress,argv[++i]);
        !            73:                        break;
        !            74:                case 'y':
        !            75:                        strcpy(ttynamestr,argv[++i]);
        !            76:                        break;
        !            77:                case 'x':
        !            78:                        lutmptime = atol(argv[++i]);
        !            79:                        break;
        !            80:                case 'f':
        !            81:                        strcpy(fromaddress,argv[++i]);
        !            82:                        break;
        !            83:                case 'c':
        !            84:                        strcpy(cmdstr,argv[++i]);
        !            85:                        break;
        !            86:                case 'e':
        !            87:                        strcpy(stimeSent,argv[++i]);
        !            88:                        break;
        !            89:                case 'r':
        !            90:                        strcpy(src,argv[++i]);
        !            91:                        break;
        !            92:                }
        !            93:                /* it is important that this code ignore unknown flags
        !            94:                   so that options can be added w/o recompiling */
        !            95:        }
        !            96: 
        !            97:        ltimeSent=atol(stimeSent)+TIMEBASE;
        !            98: 
        !            99:        setjmp(env);
        !           100:        alarm(0);
        !           101:        signal(SIGALRM,alarmint);
        !           102:        if(errno != 100 && ttynamestr[0] && ttynamestr[8] != 'x'){
        !           103:                alarm(100);
        !           104:                putmp = getutmp(ttynamestr);
        !           105:                if(putmp != NULL) otime = putmp->ut_time;
        !           106:                /*
        !           107:                debug("lutmptime %lo otime %lo",lutmptime,otime);
        !           108:                */
        !           109:                if(otime != 0 && otime == lutmptime) {
        !           110:                        file = fopen(ttynamestr,"w");
        !           111:                        if(file != NULL && fstat(fileno(file),&statbuf) !=  -1
        !           112:                                && (statbuf.st_mode&02)){
        !           113:                                alarm(0);
        !           114:                                if(src[0] != 0)sprintf(stemp,", R: %s",src);
        !           115:                                else stemp[0] = 0;
        !           116:                                ltimeCur = gettime();
        !           117:                                stimeCur = ctime(&ltimeCur);
        !           118:                                stimeCur += 11;
        !           119:                                stimeCur[strlen(stimeCur)-9] = 0;
        !           120:                                fprintf(file,
        !           121:                                        "\r\nMessage from %s at %s ...\r\n",
        !           122:                                        fromaddress, stimeCur);
        !           123:                                if(cmdstr[0] != 0){
        !           124:                                        s = ctime(&ltimeSent);
        !           125:                                        s[strlen(s)-6] = 0;
        !           126:                                        ltimeElap = ltimeCur - ltimeSent;
        !           127:                                        fprintf(file,
        !           128:                                        "(command: %s%s, sent %s, took %s)\r\n",
        !           129:                                        cmdstr,stemp,s,comptime(ltimeElap));
        !           130:                                }
        !           131:                                while(fgets(buf,BUFSIZ,stdin) != NULL){
        !           132:                                        fputs(buf,file);
        !           133:                                        fputc('\r',file);
        !           134:                                }
        !           135:                                fprintf(file,"------\r\n");
        !           136:                                exit(EX_OK);
        !           137:                                }
        !           138:                        }
        !           139:                }
        !           140:        
        !           141:        /* well, couldn't write to him, so we'll mail to him on this mach */
        !           142:        /* mail to "toaddress", saying its from "fromaddress", about a command
        !           143:           "cmdstr", which was sent at time "stimeSent" */
        !           144: 
        !           145:        alarm(0);
        !           146:        sprintf(stimeSent,"%ld",ltimeSent);
        !           147:        if(cmdstr[0] != 0){
        !           148:                if(src[0] != 0)
        !           149:                        mexecl(MMAILCMD,"mmail", "-r",src, "-c",cmdstr,
        !           150:                                "-e",stimeSent,"-f",fromaddress,
        !           151:                                "-t",toaddress,"-z",0);
        !           152:                else
        !           153:                        mexecl(MMAILCMD,"mmail", "-c",cmdstr, "-e",stimeSent,
        !           154:                                "-f",fromaddress, "-t",toaddress,"-z",0);
        !           155:        }
        !           156:        else
        !           157:                mexecl(MMAILCMD,"mmail", "-f",fromaddress, "-t",toaddress,
        !           158:                        "-z", 0);
        !           159:        perror(MMAILCMD);
        !           160:        exit(EX_UNAVAILABLE);
        !           161: }
        !           162: alarmint(){
        !           163:        errno = 100;
        !           164:        signal(SIGALRM,SIG_IGN);                /* alarm off */
        !           165:        longjmp(env,0);                 /* ugh */
        !           166:        }

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