linux c之htpasswd

/*
* htpasswd.c: simple program for manipulating password file for NCSA httpd
*
* Rob McCool
*/

/* Modified 29aug97 by Jef Poskanzer to accept new password on stdin,
** if stdin is a pipe or file.  This is necessary for use from CGI.
*/

#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <crypt.h>

//extern char *crypt(const char *key, const char *setting);

#define LF 10
#define CR 13

#define MAX_STRING_LEN 256

int tfd;
char temp_template[] = "/tmp/htp.XXXXXX";

void interrupted(int);

static char * strd(char *s) {
char *d;

d=(char *)malloc(strlen(s) + 1);
strcpy(d,s);
return(d);
}

static 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++]));
}

#ifdef  _WIN32
static 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;
}
}
#endif

static 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";

static void to64(register char *s, register long v, register int n) {
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
}
}

#ifdef MPE
/* MPE lacks getpass() and a way to suppress stdin echo.  So for now, just
issue the prompt and read the results with echo.  (Ugh). */

char *getpass(const char *prompt) {

static char password[81];

fputs(prompt,stderr);
gets((char *)&password);

if (strlen((char *)&password) > 8) {
password[8]='\0';
}

return (char *)&password;
}
#endif

static void add_password( char* user, FILE* f )
{
char pass[100];
char* pw;
char* cpw;
char salt[3];

if ( ! isatty( fileno( stdin ) ) )
{
(void) fgets( pass, sizeof(pass), stdin );
if ( pass[strlen(pass) - 1] == '\n' )
pass[strlen(pass) - 1] = '\0';
pw = pass;
}
else
{
pw = strd( (char*) getpass( "New password:" ) );
if ( strcmp( pw, (char*) getpass( "Re-type new password:" ) ) != 0 )
{
(void) fprintf( stderr, "They don't match, sorry.\n" );
if ( tfd != -1 )
unlink( temp_template );
exit( 1 );
}
}
(void) srandom( (int) time( (time_t*) 0 ) );
to64( &salt[0], random(), 2 );
// LIBS+=-lcrypt
cpw = crypt( pw, salt );
(void) fprintf( f, "%s:%s\n", user, cpw );
}

static void usage(void) {
fprintf(stderr,"Usage: htpasswd [-c] passwordfile username\n");
fprintf(stderr,"The -c flag creates a new file.\n");
exit(1);
}

void interrupted(int signo) {
fprintf(stderr,"Interrupted.\n");
if(tfd != -1)
unlink(temp_template);
exit(1);
}

int 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;

tfd = -1;
signal(SIGINT,(void (*)(int))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();

tfd = mkstemp(temp_template);
if(!(tfp = fdopen(tfd,"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",temp_template,argv[1]);
system(command);
unlink(temp_template);
exit(0);
}