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/*
* htpasswd.c: simple program for manipulating password file for NCSA httpd
* Rob McCool
*/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <sys/signal.h>
#include <stdlib.h>
#include <time.h>
#define LF 10
#define CR 13
#define MAX_STRING_LEN 256
char *tn;
char *strd(char *s) {
char *d;
d=(char *)malloc(strlen(s) + 1);
strcpy(d,s);
return(d);
}
void getword(char *word, char *line, char stop) {
int x = 0,y;
for(x=0;((line[x]) && (line[x] != stop));x++)
word[x] = line[x];
word[x] = '\0';
if(line[x]) ++x;
y=0;
while(line[y++] = line[x++]);
}
int getline(char *s, int n, FILE *f) {
register int i=0;
while(1) {
s[i] = (char)fgetc(f);
if(s[i] == CR)
s[i] = fgetc(f);
if((s[i] == 0x4) || (s[i] == LF) || (i == (n-1))) {
s[i] = '\0';
return (feof(f) ? 1 : 0);
}
++i;
}
}
void putline(FILE *f,char *l) {
int x;
for(x=0;l[x];x++) fputc(l[x],f);
fputc('\n',f);
}
/* From local_passwd.c (C) Regents of Univ. of California blah blah */
static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
to64(s, v, n)
register char *s;
register long v;
register int n;
{
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
}
}
char *crypt(char *pw, char *salt); /* why aren't these prototyped in include */
#ifdef HEAD_GETPASS
char *getpass(char *prompt);
#endif
void add_password(char *user, FILE *f) {
char *pw, *cpw, salt[3];
pw = strd(getpass("New password:"));
if(strcmp(pw,getpass("Re-type new password:"))) {
fprintf(stderr,"They don't match, sorry.\n");
if(tn)
unlink(tn);
exit(1);
}
(void)srand((int)time((time_t *)NULL));
to64(&salt[0],rand(),2);
cpw = crypt(pw,salt);
free(pw);
fprintf(f,"%s:%s\n",user,cpw);
}
void usage() {
fprintf(stderr,"Usage: htpasswd [-c] passwordfile username\n");
fprintf(stderr,"The -c flag creates a new file.\n");
exit(1);
}
void interrupted() {
fprintf(stderr,"Interrupted.\n");
if(tn) unlink(tn);
exit(1);
}
main(int argc, char *argv[]) {
FILE *tfp,*f;
char user[MAX_STRING_LEN];
char line[MAX_STRING_LEN];
char l[MAX_STRING_LEN];
char w[MAX_STRING_LEN];
char command[MAX_STRING_LEN];
int found;
tn = NULL;
signal(SIGINT,(void (*)())interrupted);
if(argc == 4) {
if(strcmp(argv[1],"-c"))
usage();
if(!(tfp = fopen(argv[2],"w"))) {
fprintf(stderr,"Could not open passwd file %s for writing.\n",
argv[2]);
perror("fopen");
exit(1);
}
printf("Adding password for %s.\n",argv[3]);
add_password(argv[3],tfp);
fclose(tfp);
exit(0);
} else if(argc != 3) usage();
tn = tmpnam(NULL);
if(!(tfp = fopen(tn,"w"))) {
fprintf(stderr,"Could not open temp file.\n");
exit(1);
}
if(!(f = fopen(argv[1],"r"))) {
fprintf(stderr,
"Could not open passwd file %s for reading.\n",argv[1]);
fprintf(stderr,"Use -c option to create new one.\n");
exit(1);
}
strcpy(user,argv[2]);
found = 0;
while(!(getline(line,MAX_STRING_LEN,f))) {
if(found || (line[0] == '#') || (!line[0])) {
putline(tfp,line);
continue;
}
strcpy(l,line);
getword(w,l,':');
if(strcmp(user,w)) {
putline(tfp,line);
continue;
}
else {
printf("Changing password for user %s\n",user);
add_password(user,tfp);
found = 1;
}
}
if(!found) {
printf("Adding user %s\n",user);
add_password(user,tfp);
}
fclose(f);
fclose(tfp);
sprintf(command,"cp %s %s",tn,argv[1]);
system(command);
unlink(tn);
}
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