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Annotation of 3BSD/cmd/net/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:    (ROPTION)
        !            29:                mail -f fromaddress toaddress
        !            30:        which becomes mail from "fromaddress" instead of "network".
        !            31: 
        !            32:    (ROPTION2)
        !            33:                mail -r frommach fromuser toaddress
        !            34:        which becomes mail from "fromach:fromuser" instead of "network".
        !            35: 
        !            36:    ROPTION is to be preferred.
        !            37: 
        !            38: 2. We assume that mail accepts the "-h hopcnt" flag, and passes it thru
        !            39:    unchanged to the sendberkmail program.  The hopcnt is incremented everytime
        !            40:    it passes thru mmail, so inifinite mail forwarding is detected.
        !            41:    Since both the from and to addresses cycle, it there is infinite looping
        !            42:    we simply mail to root to that effect and throw away the mail.
        !            43: 
        !            44: 
        !            45:    If this argument scheme looks flakey it is because I screwed up
        !            46:    in the argument design.  With the network now up to 10 machines,
        !            47:    I can't add another parameter to the internal commands of the network
        !            48:    like mmail and mwrite.  If I had used labeled parms instead of
        !            49:    positional parms, I would be able to add more options/info
        !            50:    without having to recompile all code...
        !            51: 
        !            52:    exit codes:
        !            53:        normally returns the exit code from the mail program
        !            54:        returns 101 if unable to exec the mail program
        !            55:        returns 102 if infinite mail forwarding loop is detected.
        !            56: 
        !            57:    NUID is the value returned from getuid for "network" account.
        !            58: */
        !            59: main(argc,argv)
        !            60:   char **argv; {
        !            61:        int pip[2], n, ret, i, uid, roption = 0, hopcnt = 0, pid;
        !            62:        char *sargv[20], *cmdstr=NULL, buf[BUFSIZ], *timestr, fromaddress[BUFSIZ];
        !            63:        char toaddress[BUFSIZ], src[20], snFrom[BUFSIZ], snto[BUFSIZ], mchFrom, mchto,
        !            64:                *sn, stemp[BUFSIZ], fisresponse = 0;
        !            65:        long timesent = TIMEBASE, el;
        !            66: 
        !            67:        debugflg = DBV;
        !            68:        src[0] = 0;
        !            69: 
        !            70:        /* parse old format positional parms */
        !            71:        if(argv[1][0] == '-'){
        !            72:                cmdstr = argv[1] + 1;
        !            73:                timesent = atol(argv[2] + 1);
        !            74:                sprintf(fromaddress,"%s:%s",argv[4],argv[3]);
        !            75:                strcpy(toaddress,argv[5]);
        !            76:        }
        !            77:        else {
        !            78:                sprintf(fromaddress,"%s:%s",argv[2],argv[1]);
        !            79:                strcpy(toaddress,argv[3]);
        !            80:        }
        !            81:        argv[argc] = 0;
        !            82: 
        !            83:        /* parse labeled parameters */
        !            84:        /*  prob because of -cmd in arg1 and arg2 */
        !            85:        for(i = 1; i < argc; i++){
        !            86:                if(argv[i][0] == '-' && argv[i][2] == 0)
        !            87:                switch(argv[i][1]){
        !            88:                case 'f': 
        !            89:                        strcpy(fromaddress,argv[++i]);
        !            90:                        break;
        !            91:                case 'c': 
        !            92:                        cmdstr = argv[++i];
        !            93:                        break;
        !            94:                case 'e':
        !            95:                        timesent = atol(argv[++i]);
        !            96:                        break;
        !            97:                case 't':
        !            98:                        strcpy(toaddress,argv[++i]);
        !            99:                        break;
        !           100:                case 'h':
        !           101:                        hopcnt = atoi(argv[++i]);
        !           102:                        break;
        !           103:                case 'r':
        !           104:                        strcpy(src,argv[++i]);
        !           105:                        break;
        !           106:                case 'z':
        !           107:                        fisresponse++;
        !           108:                        break;
        !           109:                /* it is important there be no error if an unknown
        !           110:                   flag is encountered */
        !           111:                }
        !           112:        }
        !           113:        mchFrom = MchSFromAddr(snFrom,fromaddress);
        !           114: 
        !           115:        /* compute time send */
        !           116:        timestr = ctime(&timesent);
        !           117:        timestr[strlen(timestr) - 6] = 0;
        !           118:        el = gettime() - timesent;
        !           119: 
        !           120: # ifdef ROPTION
        !           121:        /* only use roption if super-user or "network" */
        !           122: /*
        !           123:        uid = getuid();
        !           124:        uid = uidmask(uid);
        !           125:        if(uid == SUPERUSER || uid == NUID)roption++;
        !           126: */
        !           127:        /* or if mail is to the same user who is sending it */
        !           128: /*
        !           129:        sn = SnCurrent();
        !           130:        if(sn != NULL){
        !           131:                stemp[0] = 0;
        !           132:                mchfrom = MchSFromAddr(stemp,fromaddress);
        !           133:                if(strcmp(stemp,????) == 0)roption++;
        !           134:        }
        !           135:        uid = geteuid();
        !           136:        uid = uidmask(uid);
        !           137:        if(uid == SUPERUSER || uid == NUID)roption++;
        !           138: */
        !           139:        roption++;
        !           140: # endif
        !           141: 
        !           142: # ifdef ROPTION2
        !           143:        /* only use roption if super-user or "network" */
        !           144:        uid = getuid();
        !           145:        uid = uidmask(uid);
        !           146:        if(uid == SUPERUSER || uid == NUID)roption++;
        !           147:        /* or if mail is to the same user who is sending it */
        !           148:        /* disabled since mail must accept this  and it does not now */
        !           149:        /* if(strcmp(SnCurrent(),argv[3]) == 0)roption++; */
        !           150:        uid = geteuid();
        !           151:        uid = uidmask(uid);
        !           152:        if(uid == SUPERUSER || uid == NUID)roption++;
        !           153: # endif
        !           154: 
        !           155:        /* check the hopcnt */
        !           156:        hopcnt++;
        !           157:        if(hopcnt > MAXHOPS)hopcnterr(toaddress, hopcnt);
        !           158: 
        !           159:        /* analyze the dest, if local, strip off mach name, otherwise ok */
        !           160:        mchto = MchSFromAddr(snto,toaddress);
        !           161:        if(mchto == local)strcpy(toaddress,snto);
        !           162: 
        !           163:        /* add the hopcnt here */
        !           164:        if(roption){
        !           165:                sargv[1] = "-r";
        !           166: # ifdef ROPTION2
        !           167:                sargv[2] = longname(mchFrom);
        !           168:                sargv[3] = snFrom;
        !           169:                sargv[4] = toaddress;
        !           170:                sargv[5] = 0;
        !           171: # endif
        !           172: # ifdef ROPTION
        !           173:                sargv[2] = fromaddress;
        !           174:                sargv[3] = toaddress;
        !           175:                sargv[4] = 0;
        !           176: # endif
        !           177:                }
        !           178:        else {
        !           179:                sargv[1] = toaddress;
        !           180:                sargv[2] = 0;
        !           181:                }
        !           182:        sargv[0] = "mail";
        !           183:        pipe(pip);
        !           184:        while((pid = fork()) == -1)sleep(2);
        !           185:        if(pid == 0){
        !           186:                close(pip[1]);
        !           187:                close(0);
        !           188:                dup(pip[0]);
        !           189:                /* by convention, SYSMAIL1 may forward this mail
        !           190:                   and response messages shouldn't be forwarded */
        !           191:                if(!fisresponse)
        !           192:                        execv(SYSMAIL1, sargv);
        !           193:                execv(SYSMAIL2, sargv);
        !           194:                execv(SYSMAIL3, sargv);
        !           195:                execv(SYSMAIL4, sargv);
        !           196:                exit(101);
        !           197:                /* mexecv is not used because it gives a diagnostic */
        !           198:                }
        !           199:        close(pip[0]);
        !           200:        close(1);
        !           201:        dup(pip[1]);
        !           202:        if(!roption)
        !           203:                printf("(from %s)\n",fromaddress);
        !           204:        if(cmdstr != NULL){
        !           205:                if(src[0] != 0)sprintf(stemp,", R: %s", src);
        !           206:                else stemp[0] = 0;
        !           207:                printf("(command: %s%s, sent %s, took %s)\n",
        !           208:                        cmdstr,stemp,timestr,comptime(el));
        !           209:        }
        !           210:        fflush(stdout);
        !           211:        while((n = read(0,buf,BUFSIZ)) > 0)
        !           212:                write(pip[1],buf,n);
        !           213:        close(pip[1]);
        !           214:        close(1);
        !           215:        wait(&ret);
        !           216:        ret >>= 8;
        !           217:        if(ret != 0)
        !           218:                fprintf(stderr,
        !           219:                "Non-zero return code (%d) from the mail program.\n",ret);
        !           220:        exit(ret);
        !           221:        }
        !           222: /*
        !           223:        hopcnterr()
        !           224: 
        !           225:        there appears to be infinite mail forwarding -
        !           226:        as detected by the hop count.  Mail to root and give up.
        !           227:        Both the from and to addresses are cycling, so mail 
        !           228:        can't be sent there.
        !           229: */
        !           230: hopcnterr(toaddress,hopcnt)
        !           231:        char *toaddress;
        !           232:        int hopcnt;
        !           233: {
        !           234:        char cmdstr[BUFSIZ];
        !           235:        int rcode;
        !           236:        sprintf(cmdstr,"echo infinite mail loop for %s hops %d | mail root",
        !           237:                toaddress,hopcnt);
        !           238:        rcode = system(cmdstr);
        !           239:        exit(102);
        !           240:        /*UNREACHED*/
        !           241: }

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