4.3BSD - /usr/src/etc/vipw.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: char copyright[] =
   9: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
  10:  All rights reserved.\n";
  11: #endif not lint
  12: 
  13: #ifndef lint
  14: static char sccsid[] = "@(#)vipw.c	5.1 (Berkeley) 5/28/85";
  15: #endif not lint
  16: 
  17: #include <sys/types.h>
  18: #include <sys/stat.h>
  19: #include <sys/file.h>
  20: 
  21: #include <stdio.h>
  22: #include <errno.h>
  23: #include <signal.h>
  24: 
  25: /*
  26:  * Password file editor with locking.
  27:  */
  28: char    temp[] = "/etc/ptmp";
  29: char    temp_pag[] = "/etc/ptmp.pag";
  30: char    temp_dir[] = "/etc/ptmp.dir";
  31: char    passwd[] = "/etc/passwd";
  32: char    passwd_pag[] = "/etc/passwd.pag";
  33: char    passwd_dir[] = "/etc/passwd.dir";
  34: char    buf[BUFSIZ];
  35: char    *getenv();
  36: char    *index();
  37: extern  int errno;
  38: 
  39: main(argc, argv)
  40:     char *argv[];
  41: {
  42:     int fd;
  43:     FILE *ft, *fp;
  44:     char *editor;
  45: 
  46:     signal(SIGHUP, SIG_IGN);
  47:     signal(SIGINT, SIG_IGN);
  48:     signal(SIGQUIT, SIG_IGN);
  49:     setbuf(stderr, NULL);
  50:     umask(0);
  51:     fd = open(temp, O_WRONLY|O_CREAT|O_EXCL, 0644);
  52:     if (fd < 0) {
  53:         if (errno == EEXIST) {
  54:             fprintf(stderr, "vipw: password file busy\n");
  55:             exit(1);
  56:         }
  57:         fprintf(stderr, "vipw: "); perror(temp);
  58:         exit(1);
  59:     }
  60:     ft = fdopen(fd, "w");
  61:     if (ft == NULL) {
  62:         fprintf(stderr, "vipw: "); perror(temp);
  63:         goto bad;
  64:     }
  65:     fp = fopen(passwd, "r");
  66:     if (fp == NULL) {
  67:         fprintf(stderr, "vipw: "); perror(passwd);
  68:         goto bad;
  69:     }
  70:     while (fgets(buf, sizeof (buf) - 1, fp) != NULL)
  71:         fputs(buf, ft);
  72:     fclose(ft); fclose(fp);
  73:     editor = getenv("EDITOR");
  74:     if (editor == 0)
  75:         editor = "vi";
  76:     sprintf(buf, "%s %s", editor, temp);
  77:     if (system(buf) == 0) {
  78:         struct stat sbuf;
  79:         int ok;
  80: 
  81:         /* sanity checks */
  82:         if (stat(temp, &sbuf) < 0) {
  83:             fprintf(stderr,
  84:                 "vipw: can't stat temp file, %s unchanged\n",
  85:                 passwd);
  86:             goto bad;
  87:         }
  88:         if (sbuf.st_size == 0) {
  89:             fprintf(stderr, "vipw: bad temp file, %s unchanged\n",
  90:                 passwd);
  91:             goto bad;
  92:         }
  93:         ft = fopen(temp, "r");
  94:         if (ft == NULL) {
  95:             fprintf(stderr,
  96:                 "vipw: can't reopen temp file, %s unchanged\n",
  97:                 passwd);
  98:             goto bad;
  99:         }
 100:         ok = 0;
 101:         while (fgets(buf, sizeof (buf) - 1, ft) != NULL) {
 102:             register char *cp;
 103: 
 104:             cp = index(buf, '\n');
 105:             if (cp == 0)
 106:                 continue;
 107:             *cp = '\0';
 108:             cp = index(buf, ':');
 109:             if (cp == 0)
 110:                 continue;
 111:             *cp = '\0';
 112:             if (strcmp(buf, "root"))
 113:                 continue;
 114:             /* password */
 115:             cp = index(cp + 1, ':');
 116:             if (cp == 0)
 117:                 break;
 118:             /* uid */
 119:             if (atoi(cp + 1) != 0)
 120:                 break;
 121:             cp = index(cp + 1, ':');
 122:             if (cp == 0)
 123:                 break;
 124:             /* gid */
 125:             cp = index(cp + 1, ':');
 126:             if (cp == 0)
 127:                 break;
 128:             /* gecos */
 129:             cp = index(cp + 1, ':');
 130:             if (cp == 0)
 131:                 break;
 132:             /* login directory */
 133:             if (strncmp(++cp, "/:", 2))
 134:                 break;
 135:             cp += 2;
 136:             if (*cp && strcmp(cp, "/bin/sh") &&
 137:                 strcmp(cp, "/bin/csh"))
 138:                 break;
 139:             ok++;
 140:         }
 141:         fclose(ft);
 142:         if (ok) {
 143:             if (makedb(temp) < 0)
 144:                 fprintf(stderr, "vipw: mkpasswd failed\n");
 145:             else if (rename(temp_pag, passwd_pag) < 0)
 146:                 fprintf(stderr, "vipw: "), perror(temp_pag);
 147:             else if (rename(temp_dir, passwd_dir) < 0)
 148:                 fprintf(stderr, "vipw: "), perror(temp_dir);
 149:             else if (rename(temp, passwd) < 0)
 150:                 fprintf(stderr, "vipw: "), perror("rename");
 151:             else
 152:                 exit(0);
 153:         } else
 154:             fprintf(stderr,
 155:                 "vipw: you mangled the temp file, %s unchanged\n",
 156:                 passwd);
 157:     }
 158: bad:
 159:     unlink(temp_pag);
 160:     unlink(temp_dir);
 161:     unlink(temp);
 162:     exit(1);
 163: }
 164: 
 165: makedb(file)
 166:     char *file;
 167: {
 168:     int status, pid, w;
 169: 
 170:     if ((pid = vfork()) == 0) {
 171:         execl("/etc/mkpasswd", "mkpasswd", file, 0);
 172:         _exit(127);
 173:     }
 174:     while ((w = wait(&status)) != pid && w != -1)
 175:         ;
 176:     if (w == -1 || status != 0)
 177:         status = -1;
 178:     return(status);
 179: }

Defined functions

Defined variables