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Annotation of 41BSD/cmd/rmail.c, revision 1.1

1.1     ! root        1: static char *sccsid = "@(#)rmail.c     4.1 (Berkeley) 10/1/80";
        !             2: /*
        !             3:  * rmail: front end for mail to stack up those stupid >From ... remote from ...
        !             4:  * lines and make a correct return address.  This works with the -f option
        !             5:  * to /etc/delivermail so it won't work on systems without delivermail.
        !             6:  * However, it ought to be easy to modify a standard /bin/mail to do the
        !             7:  * same thing.
        !             8:  *
        !             9:  * NOTE: Rmail is SPECIFICALLY INTENDED for ERNIE COVAX because of its
        !            10:  * physical position as a gateway between the uucp net and the arpanet.
        !            11:  * By default, other sites will probably want /bin/rmail to be a link
        !            12:  * to /bin/mail, as it was intended by BTL.  However, other than the
        !            13:  * (somewhat annoying) loss of information about when the mail was
        !            14:  * originally sent, rmail should work OK on other systems running uucp.
        !            15:  * If you don't run uucp you don't even need any rmail.
        !            16:  */
        !            17: 
        !            18: #include <stdio.h>
        !            19: FILE *popen();
        !            20: char *index();
        !            21: 
        !            22: #define MAILER "/etc/delivermail"
        !            23: 
        !            24: main(argc, argv)
        !            25: char **argv;
        !            26: {
        !            27:        FILE *out;      /* output to delivermail */
        !            28:        char lbuf[512]; /* one line of the message */
        !            29:        char from[512]; /* accumulated path of sender */
        !            30:        char ufrom[64]; /* user on remote system */
        !            31:        char sys[64];   /* a system in path */
        !            32:        char junk[512]; /* scratchpad */
        !            33:        char cmd[512];
        !            34:        char *to, *cp;
        !            35: 
        !            36:        to = argv[1];
        !            37:        if (argc != 2) {
        !            38:                fprintf(stderr, "Usage: rmail user\n");
        !            39:                exit(1);
        !            40:        }
        !            41: 
        !            42:        for (;;) {
        !            43:                fgets(lbuf, sizeof lbuf, stdin);
        !            44:                if (strncmp(lbuf, "From ", 5) && strncmp(lbuf, ">From ", 6))
        !            45:                        break;
        !            46:                /* sscanf(lbuf, "%s %s %s %s %s %s %s remote from %s", junk, ufrom, junk, junk, junk, junk, junk, sys); */
        !            47:                sscanf(lbuf, "%s %s", junk, ufrom);
        !            48:                cp = lbuf;
        !            49:                for (;;) {
        !            50:                        cp = index(cp+1, 'r');
        !            51:                        if (cp == NULL)
        !            52:                                cp = "remote from somewhere";
        !            53: #ifdef DEBUG
        !            54:                        printf("cp='%s'\n", cp);
        !            55: #endif
        !            56:                        if (strncmp(cp, "remote from ", 12)==0)
        !            57:                                break;
        !            58:                }
        !            59:                sscanf(cp, "remote from %s", sys);
        !            60:                strcat(from, sys);
        !            61:                strcat(from, "!");
        !            62: #ifdef DEBUG
        !            63:                printf("ufrom='%s', sys='%s', from now '%s'\n", ufrom, sys, from);
        !            64: #endif
        !            65:        }
        !            66:        strcat(from, ufrom);
        !            67: 
        !            68:        sprintf(cmd, "%s -r%s %s", MAILER, from, to);
        !            69: #ifdef DEBUG
        !            70:        printf("cmd='%s'\n", cmd);
        !            71: #endif
        !            72:        out = popen(cmd, "w");
        !            73:        fputs(lbuf, out);
        !            74:        while (fgets(lbuf, sizeof lbuf, stdin))
        !            75:                fputs(lbuf, out);
        !            76:        pclose(out);
        !            77: }
        !            78: 
        !            79: /*
        !            80:  * Return the ptr in sp at which the character c appears;
        !            81:  * NULL if not found
        !            82:  */
        !            83: 
        !            84: char *
        !            85: index(sp, c)
        !            86: register char *sp, c;
        !            87: {
        !            88:        do {
        !            89:                if (*sp == c)
        !            90:                        return(sp);
        !            91:        } while (*sp++);
        !            92:        return(NULL);
        !            93: }

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