-#ifndef lint
-static char *sccsid = "@(#)chfn.sh 4.5 (Berkeley) %G%";
-#endif lint
-
-/*
- * changefinger - change finger entries
- */
-#include <stdio.h>
-#include <signal.h>
-#include <pwd.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <sys/file.h>
-#include <ctype.h>
-
-struct default_values {
- char *name;
- char *office_num;
- char *office_phone;
- char *home_phone;
-};
-
-char passwd[] = "/etc/passwd";
-char temp[] = "/etc/ptmp";
-struct passwd *pwd;
-struct passwd *getpwent(), *getpwnam(), *getpwuid();
-int endpwent();
-char *crypt();
-char *getpass();
-
-main(argc, argv)
- int argc;
- char *argv[];
-{
- int user_uid;
- char replacement[4*BUFSIZ];
- int fd;
- FILE *tf;
-
- if (argc > 2) {
- printf("Usage: changefinger [user]\n");
- exit(1);
- }
- /*
- * Error check to make sure the user (foolishly) typed their own name.
- */
- user_uid = getuid();
- if ((argc == 2) && (user_uid != 0)) {
- pwd = getpwnam(argv[1]);
- if (pwd == NULL) {
- printf("%s%s%s%s%s%s%s%s",
- "There is no account for ", argv[1],
- " on this machine.\n",
- "You probably mispelled your login name;\n",
- "only root is allowed to change another",
- " person's finger entry.\n",
- "Note: you do not need to type your login",
- " name as an argument.\n");
- exit(1);
- }
- if (pwd->pw_uid != user_uid) {
- printf("%s%s",
- "You are not allowed to change another",
- " person's finger entry.\n");
- exit(1);
- }
- }
- /*
- * If root is changing a finger entry, then find the uid that
- * corresponds to the user's login name.
- */
- if ((argc == 2) && (user_uid == 0)) {
- pwd = getpwnam(argv[1]);
- if (pwd == NULL) {
- printf("There is no account for %s on this machine\n",
- pwd->pw_name);
- exit(1);
- }
- user_uid = pwd->pw_uid;
- }
- if (argc == 1) {
- pwd = getpwuid(user_uid);
- if (pwd == NULL) {
- fprintf(stderr, "No passwd file entry!?\n");
- exit(1);
- }
- }
- /*
- * Collect name, room number, school phone, and home phone.
- */
- get_info(pwd->pw_gecos, replacement);
-
- (void) signal(SIGHUP, SIG_IGN);
- (void) signal(SIGINT, SIG_IGN);
- (void) signal(SIGQUIT, SIG_IGN);
- (void) signal(SIGTSTP, SIG_IGN);
- if ((fd = open(temp, O_CREAT|O_EXCL|O_RDWR, 0644)) < 0) {
- printf("Temporary file busy -- try again\n");
- exit(1);
- }
- if ((tf = fdopen(fd, "w")) == NULL) {
- printf("Absurd fdopen failure - seek help\n");
- goto out;
- }
- unlimit(RLIMIT_CPU);
- unlimit(RLIMIT_FSIZE);
- /*
- * Copy passwd to temp, replacing matching lines
- * with new gecos field.
- */
- while ((pwd = getpwent()) != NULL) {
- if (pwd->pw_uid == user_uid)
- pwd->pw_gecos = replacement;
- fprintf(tf,"%s:%s:%d:%d:%s:%s:%s\n",
- pwd->pw_name,
- pwd->pw_passwd,
- pwd->pw_uid,
- pwd->pw_gid,
- pwd->pw_gecos,
- pwd->pw_dir,
- pwd->pw_shell);
- }
- (void) endpwent();
- if (rename(temp, passwd) < 0) {
- fprintf(stderr, "chfn: "); perror("rename");
- out:
- (void) unlink(temp);
- exit(1);
- }
- (void) fclose(tf);
- exit(0);
-}
-
-unlimit(lim)
-{
- struct rlimit rlim;
-
- rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
- (void) setrlimit(lim, &rlim);
-}
-
-/*
- * Get name, room number, school phone, and home phone.
- */
-get_info(gecos_field, answer)
- char *gecos_field;
- char *answer;
-{
- char *strcpy(), *strcat();
- char in_str[BUFSIZ];
- struct default_values *defaults, *get_defaults();
-
- answer[0] = '\0';
- defaults = get_defaults(gecos_field);
- printf("Default values are printed inside of of '[]'.\n");
- printf("To accept the default, type <return>.\n");
- printf("To have a blank entry, type the word 'none'.\n");
- /*
- * Get name.
- */
- do {
- printf("\nName [%s]: ", defaults->name);
- (void) fgets(in_str, BUFSIZ, stdin);
- if (special_case(in_str, defaults->name))
- break;
- } while (illegal_input(in_str));
- (void) strcpy(answer, in_str);
- /*
- * Get room number.
- */
- do {
- printf("Room number (Exs: 597E or 197C) [%s]: ",
- defaults->office_num);
- (void) fgets(in_str, BUFSIZ, stdin);
- if (special_case(in_str, defaults->office_num))
- break;
- } while (illegal_input(in_str) || illegal_building(in_str));
- (void) strcat(strcat(answer, ","), in_str);
- /*
- * Get office phone number.
- * Remove hyphens and 642, x2, or 2 prefixes if present.
- */
- do {
- printf("Office Phone (Ex: 1632) [%s]: ",
- defaults->office_phone);
- (void) fgets(in_str, BUFSIZ, stdin);
- if (special_case(in_str, defaults->office_phone))
- break;
- remove_hyphens(in_str);
- if ((strlen(in_str) == 8) && (strcmpn(in_str, "642", 3) == 0))
- (void) strcpy(in_str, in_str+3);
- if ((strlen(in_str) == 7) && (strcmpn(in_str, "x2", 2) == 0))
- (void) strcpy(in_str, in_str+2);
- if ((strlen(in_str) == 6) && (in_str[0] == '2'))
- (void) strcpy(in_str, in_str+1);
- } while (illegal_input(in_str) || not_all_digits(in_str)
- || wrong_length(in_str, 4));
- (void) strcat(strcat(answer, ","), in_str);
- /*
- * Get home phone number.
- * Remove hyphens if present.
- */
- do {
- printf("Home Phone (Ex: 9875432) [%s]: ", defaults->home_phone);
- (void) fgets(in_str, BUFSIZ, stdin);
- if (special_case(in_str, defaults->home_phone))
- break;
- remove_hyphens(in_str);
- } while (illegal_input(in_str) || not_all_digits(in_str));
- (void) strcat(strcat(answer, ","), in_str);
-}
-
-/*
- * Prints an error message if a ':' or a newline is found in the string.
- * A message is also printed if the input string is too long.
- * The password file uses :'s as seperators, and are not allowed in the "gcos"
- * field. Newlines serve as delimiters between users in the password file,
- * and so, those too, are checked for. (I don't think that it is possible to
- * type them in, but better safe than sorry)
- *
- * Returns '1' if a colon or newline is found or the input line is too long.
- */
-illegal_input(input_str)
- char *input_str;
-{
- char *index();
- char *ptr;
- int error_flag = 0;
- int length = strlen(input_str);
-
- if (index(input_str, ':')) {
- printf("':' is not allowed.\n");
- error_flag = 1;
- }
- if (input_str[length-1] != '\n') {
- /* the newline and the '\0' eat up two characters */
- printf("Maximum number of characters allowed is %d\n",
- BUFSIZ-2);
- /* flush the rest of the input line */
- while (getchar() != '\n')
- /* void */;
- error_flag = 1;
- }
- /*
- * Delete newline by shortening string by 1.
- */
- input_str[length-1] = '\0';
- /*
- * Don't allow control characters, etc in input string.
- */
- for (ptr=input_str; *ptr != '\0'; ptr++) {
- if ((int) *ptr < 040) {
- printf("Control characters are not allowed.\n");
- error_flag = 1;
- break;
- }
- }
- return(error_flag);
-}
-
-/*
- * Removes '-'s from the input string.
- */
-remove_hyphens(str)
- char *str;
-{
- char *hyphen, *index(), *strcpy();
-
- while ((hyphen=index(str, '-')) != NULL) {
- (void) strcpy(hyphen, hyphen+1);
- }
-}
-
-/*
- * Checks to see if 'str' contains only digits (0-9). If not, then
- * an error message is printed and '1' is returned.
- */
-not_all_digits(str)
- char *str;
-{
- char *ptr;
-
- for (ptr=str; *ptr != '\0'; ++ptr) {
- if (!isdigit(*ptr)) {
- printf("Phone numbers can only contain digits.\n");
- return(1);
- }
- }
- return(0);
-}
-
-/*
- * Returns 1 when the length of the input string is not zero or equal to n.
- * Prints an error message in this case.
- */
-wrong_length(str, n)
- char *str;
- int n;
-{
-
- if ((strlen(str) != 0) && (strlen(str) != n)) {
- printf("The phone number should be %d digits long.\n", n);
- return(1);
- }
- return(0);
-}
-
-/*
- * Make sure that building is 'E' or 'C'.
- * Error correction is done if building is 'e', 'c', "evans", or "cory".
- * Correction changes "str".
- * The finger program determines the building by looking at the last
- * character. Currently, finger only allows that character to be 'E' or 'C'.
- *
- * Returns 1 if incorrect room format.
- *
- * Note: this function assumes that the newline has been removed from str.
- */
-illegal_building(str)
- char *str;
-{
- int length = strlen(str);
- char *last_ch, *ptr;
-
- /*
- * Zero length strings are acceptable input.
- */
- if (length == 0)
- return(0);
- /*
- * Delete "vans" and "ory".
- */
- if (strcmpn(str+length-4, "vans", 4) == 0) {
- length -= 4;
- str[length] = '\0';
- }
- if (strcmpn(str+length-3, "ory", 3) == 0) {
- length -= 3;
- str[length] = '\0';
- }
- last_ch = str+length-1;
- /*
- * Now change e to E or c to C.
- */
- if (*last_ch == 'e')
- *last_ch = 'E';
- if (*last_ch == 'c')
- *last_ch = 'C';
- /*
- * Delete any spaces before the E or C.
- */
- for (ptr=last_ch-1; ptr>str; ptr--) {
- if (*ptr != ' ')
- break;
- }
- (void) strcpy(ptr+1, last_ch);
- /*
- * Make sure building is evans or cory.
- */
- if ((*last_ch != 'E') && (*last_ch != 'C')) {
- printf("%s%s%s",
- "The finger program requires that your",
- " office be in Cory or Evans.\n",
- "Enter this as (for example) 597E or 197C.\n");
- return(1);
- }
- return(0);
-}
-
-/* get_defaults picks apart "str" and returns a structure points.
- * "str" contains up to 4 fields separated by commas.
- * Any field that is missing is set to blank.
- */
-struct default_values
-*get_defaults(str)
- char *str;
-{
- struct default_values *answer;
- char *malloc(), *index();
-
- answer = (struct default_values *)
- malloc((unsigned)sizeof(struct default_values));
- if (answer == (struct default_values *) NULL) {
- fprintf(stderr,
- "\nUnable to allocate storage in get_defaults!\n");
- exit(1);
- }
- /*
- * Values if no corresponding string in "str".
- */
- answer->name = str;
- answer->office_num = "";
- answer->office_phone = "";
- answer->home_phone = "";
- str = index(answer->name, ',');
- if (str == 0)
- return(answer);
- *str = '\0';
- answer->office_num = str + 1;
- str = index(answer->office_num, ',');
- if (str == 0)
- return(answer);
- *str = '\0';
- answer->office_phone = str + 1;
- str = index(answer->office_phone, ',');
- if (str == 0)
- return(answer);
- *str = '\0';
- answer->home_phone = str + 1;
- return(answer);
-}
-
-/*
- * special_case returns true when either the default is accepted
- * (str = '\n'), or when 'none' is typed. 'none' is accepted in
- * either upper or lower case (or any combination). 'str' is modified
- * in these two cases.
- */
-int special_case(str,default_str)
- char *str;
- char *default_str;
-{
- static char word[] = "none\n";
- char *ptr, *wordptr;
-
- /*
- * If the default is accepted, then change the old string do the
- * default string.
- */
- if (*str == '\n') {
- (void) strcpy(str, default_str);
- return(1);
- }
- /*
- * Check to see if str is 'none'. (It is questionable if case
- * insensitivity is worth the hair).
- */
- wordptr = word-1;
- for (ptr=str; *ptr != '\0'; ++ptr) {
- ++wordptr;
- if (*wordptr == '\0') /* then words are different sizes */
- return(0);
- if (*ptr == *wordptr)
- continue;
- if (isupper(*ptr) && (tolower(*ptr) == *wordptr))
- continue;
- /*
- * At this point we have a mismatch, so we return
- */
- return(0);
- }
- /*
- * Make sure that words are the same length.
- */
- if (*(wordptr+1) != '\0')
- return(0);
- /*
- * Change 'str' to be the null string
- */
- *str = '\0';
- return(1);
-}
projects / unix-history / blobdiff