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Annotation of 43BSDTahoe/new/notes/src/savtxt.c, revision 1.1

1.1     ! root        1: #include "parms.h"
        !             2: #include "structs.h"
        !             3: 
        !             4: #ifdef RCSIDENT
        !             5: static char rcsid[] = "$Header: savtxt.c,v 1.7 85/01/18 15:39:14 notes Rel $";
        !             6: #endif RCSIDENT
        !             7: 
        !             8: /*
        !             9:  *     savtxt - will format and write the note/response handed to
        !            10:  *     it in a specified file in the users working directory.
        !            11:  *     We have to do some forking in this case because the directory
        !            12:  *     may be protected against us. 
        !            13:  *     first save the text in a /tmp/nfs file, then fork and
        !            14:  *     setuid to the user. The file is then copied to the end
        !            15:  *     of the ultimate destination.
        !            16:  *             -- Thanks to Rick Spickelmier (tekcad!ricks)
        !            17:  *
        !            18:  *     returns the number of lines written to the file.
        !            19:  *
        !            20:  *     Original Coding:        Ray Essick      December 1981
        !            21:  */
        !            22: 
        !            23: long    lseek ();                                      /* declare for lint */
        !            24: FILE * popen ();                                       /* for lint */
        !            25: #include <signal.h>                                    /* define signal processing */
        !            26: 
        !            27: savtxt (io, where, author, date, txtwhere, title)
        !            28: struct io_f *io;
        !            29: char   *where;
        !            30: struct auth_f  *author;
        !            31: struct when_f  *date;
        !            32: struct daddr_f *txtwhere;
        !            33: char   *title;
        !            34: {
        !            35:     int     (*p) (),
        !            36:             (*q) (),
        !            37:             (*r) ();
        !            38:     int     retcode,
        !            39:             lines;
        !            40:     int     c;                                         /* character scratch */
        !            41:     register    pid,
        !            42:                 rpid;
        !            43:     FILE * txtfile;
        !            44:     FILE * outfile;
        !            45:     char    tmpfile[20];                               /* hold scratch file name */
        !            46: 
        !            47:     sprintf (tmpfile, "/tmp/nfs%d", getpid ());
        !            48:     if ((txtfile = fopen (tmpfile, "w")) == NULL)
        !            49:        return 0;                                       /* no lines saved */
        !            50:     lines = preptxt (io, txtfile, author, date, txtwhere, title);
        !            51:     fclose (txtfile);
        !            52: 
        !            53: /*
        !            54:  *     open it now so we don't have to hassle with permissions and
        !            55:  *     such.  the file is passed across the fork.
        !            56:  */
        !            57:     if ((txtfile = fopen (tmpfile, "r")) == NULL)
        !            58:        return 0;                                       /* couldn't reopen */
        !            59: 
        !            60:     if ((pid = fork ()) == 0)                          /* also makes him own file */
        !            61:     {
        !            62: #ifdef RUNSUID
        !            63:        x (setuid (globuid) < 0, "savtxt: couldn't setuid(your uid)");
        !            64: #else
        !            65:        x (setgid (getgid ()) < 0, "savtxt: couldn't setgid(your gid)");
        !            66: #endif RUNSUID
        !            67:        if (where[0] == '|')                            /* make it a pipe */
        !            68:            outfile = popen (&where[1], "w");           /* writing */
        !            69:        else
        !            70:            outfile = fopen (where, "a");               /* a simple file */
        !            71:        if (outfile == NULL)                            /* no way jose */
        !            72:            exit (1);                                   /* error */
        !            73: /*
        !            74:  *     copy the file over
        !            75:  *             there are faster ways... this works.
        !            76:  */
        !            77:        while ((c = getc (txtfile)) != EOF)
        !            78:            putc (c, outfile);                          /* copy it */
        !            79:        if (where[0] == '|')
        !            80:            pclose (outfile);                           /* pipes wait */
        !            81:        else
        !            82:            fclose (outfile);
        !            83:        fclose (txtfile);
        !            84:        exit (0);                                       /* exit ok */
        !            85:     }                                                  /* end of forked process code */
        !            86: 
        !            87:     /* wait here for the son to finish */
        !            88:     p = signal (1, SIG_IGN);
        !            89:     q = signal (2, SIG_IGN);
        !            90:     r = signal (3, SIG_IGN);
        !            91:     while ((rpid = wait (&retcode)) != pid && rpid != -1);
        !            92:     if (rpid == -1)
        !            93:        retcode = -1;
        !            94:     signal (1, p);
        !            95:     signal (2, q);
        !            96:     signal (3, r);
        !            97: 
        !            98:     fclose (txtfile);                                  /* close it in this one too */
        !            99:     x (unlink (tmpfile) < 0, "savtxt: bad unlink of text file");
        !           100:     if (retcode)                                       /* something wrong */
        !           101:        return 0;                                       /* no lines saved */
        !           102:     else
        !           103:        return lines;
        !           104: }

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