2.9BSD - /usr/src/ucb/pwhash/src/cmd/chfn.c

   1:     char    *sccsid = "@(#)chfn.c	2.3";
   2: 
   3: /*
   4:  * chfn - change full name (or other info in gecos field)
   5:  */
   6: #include <stdio.h>
   7: #include <signal.h>
   8: #include <pwd.h>
   9: 
  10: char    passwd[] = "/etc/passwd";
  11: char    temp[]   = "/usr/adm/ptmp";
  12: struct  passwd *pwd;
  13: struct  passwd *getpwent();
  14: int endpwent();
  15: char    *crypt();
  16: char    *getpass();
  17: char    *pw;
  18: char    pwbuf[10];
  19: char    buf[BUFSIZ];
  20: 
  21: main(argc, argv)
  22: char *argv[];
  23: {
  24:     char *p;
  25:     int i;
  26:     char saltc[2];
  27:     long salt;
  28:     int u,fi,fo;
  29:     int insist;
  30:     int ok, flags;
  31:     int c;
  32:     int pwlen;
  33:     FILE *tf;
  34: 
  35:     insist = 0;
  36:     if (argc != 3) {
  37:         printf("Usage: chfn user full-name\n");
  38:         goto bex;
  39:     }
  40:     if (index(argv[2], ':') || index(argv[2], '\n')) {
  41:         printf("Illegal character in new string\n");
  42:         exit(1);
  43:     }
  44:     while((pwd=getpwent()) != NULL){
  45:         if(strcmp(pwd->pw_name,argv[1]) == 0){
  46:             u = getuid();
  47:             if(u!=0 && u != pwd->pw_uid){
  48:                 printf("Permission denied.\n");
  49:                 goto bex;
  50:                 }
  51:             break;
  52:             }
  53:         }
  54:     endpwent();
  55:     signal(SIGHUP, 1);
  56:     signal(SIGINT, 1);
  57:     signal(SIGQUIT, 1);
  58: 
  59:     if(access(temp, 0) >= 0) {
  60:         printf("Temporary file busy -- try again\n");
  61:         goto bex;
  62:     }
  63:     if((tf=fopen(temp,"w")) == NULL) {
  64:         printf("Cannot create temporary file\n");
  65:         goto bex;
  66:     }
  67: 
  68: /*
  69:  *	copy passwd to temp, replacing matching lines
  70:  *	with new shell.
  71:  */
  72: 
  73:     while((pwd=getpwent()) != NULL) {
  74:         if(strcmp(pwd->pw_name,argv[1]) == 0) {
  75:             u = getuid();
  76:             if(u != 0 && u != pwd->pw_uid) {
  77:                 printf("Permission denied.\n");
  78:                 goto out;
  79:             }
  80:             pwd->pw_gecos = argv[2];
  81:         }
  82:         fprintf(tf,"%s:%s:%u:%u:%s:%s:%s\n",
  83:             pwd->pw_name,
  84:             pwd->pw_passwd,
  85:             pwd->pw_uid,
  86:             pwd->pw_gid,
  87:             pwd->pw_gecos,
  88:             pwd->pw_dir,
  89:             pwd->pw_shell);
  90:     }
  91:     endpwent();
  92:     fclose(tf);
  93: 
  94: /*
  95:  *	copy temp back to passwd file
  96:  */
  97: 
  98:     if((fi=open(temp,0)) < 0) {
  99:         printf("Temp file disappeared!\n");
 100:         goto out;
 101:     }
 102:     if((fo=creat(passwd, 0644)) < 0) {
 103:         printf("Cannot recreat passwd file.\n");
 104:         goto out;
 105:     }
 106:     while((u=read(fi,buf,sizeof(buf))) > 0) write(fo,buf,u);
 107: 
 108: out:
 109:     unlink(temp);
 110: 
 111: bex:
 112:     exit(1);
 113: }

Defined functions

Defined variables