#include <sys/types.h>
#include <sys/socket.h>
#include <X11/Xos.h>
#ifndef X_NO_SYS_UN
#ifndef Lynx
#include <sys/un.h>
#else
#include <un.h>
#endif
#endif
#include <netinet/in.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "dm_auth.h"
#include "dm_error.h"
#ifndef INADDR_LOOPBACK
#define INADDR_LOOPBACK 0x7F000001U
#endif
static ssize_t atomicio(ssize_t (*)(), int, void *, size_t);
#ifndef offsetof
# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
int
get_prngd_bytes(char *buf, int len,
unsigned short tcp_port, char *socket_path)
{
int fd, addr_len, rval, errors;
char msg[2];
struct sockaddr *addr;
struct sockaddr_in addr_in;
struct sockaddr_un addr_un;
int af;
void (*old_sigpipe)(int);
if (socket_path == NULL && tcp_port == 0) {
LogError("get_random_prngd: "
"You must specify a port or a socket\n");
return -1;
}
if (socket_path != NULL &&
strlen(socket_path) >= sizeof(addr_un.sun_path)) {
LogError("get_random_prngd: Random pool path is too long\n");
return -1;
}
if (len > 255) {
LogError("get_random_prngd: "
"Too many bytes to read from PRNGD\n");
return -1;
}
memset(&addr_in, '\0', sizeof(addr));
if (tcp_port != 0) {
af = addr_in.sin_family = AF_INET;
addr_in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr_in.sin_port = htons(tcp_port);
addr_len = sizeof(addr_in);
addr = (struct sockaddr *)&addr_in;
} else {
af = addr_un.sun_family = AF_UNIX;
strncpy(addr_un.sun_path, socket_path,
sizeof(addr_un.sun_path));
addr_len = offsetof(struct sockaddr_un, sun_path) +
strlen(socket_path) + 1;
addr = (struct sockaddr *)&addr_un;
}
old_sigpipe = signal(SIGPIPE, SIG_IGN);
errors = 0;
rval = -1;
reopen:
fd = socket(af, SOCK_STREAM, 0);
if (fd == -1) {
LogInfo("Couldn't create socket: %s\n", strerror(errno));
goto done;
}
if (connect(fd, (struct sockaddr*)addr, addr_len) == -1) {
if (af == AF_INET) {
LogInfo("Couldn't connect to PRNGD port %d: %s\n",
tcp_port, strerror(errno));
} else {
LogInfo("Couldn't connect to PRNGD socket"
" \"%s\": %s\n",
addr_un.sun_path, strerror(errno));
}
goto done;
}
msg[0] = 0x02;
msg[1] = len;
if (atomicio(write, fd, msg, sizeof(msg)) != sizeof(msg)) {
if (errno == EPIPE && errors < 10) {
close(fd);
errors++;
goto reopen;
}
LogInfo("Couldn't write to PRNGD socket: %s\n",
strerror(errno));
goto done;
}
if (atomicio(read, fd, buf, len) != len) {
if (errno == EPIPE && errors < 10) {
close(fd);
errors++;
goto reopen;
}
LogInfo("Couldn't read from PRNGD socket: %s\n",
strerror(errno));
goto done;
}
rval = 0;
done:
signal(SIGPIPE, old_sigpipe);
if (fd != -1)
close(fd);
return rval;
}
static ssize_t
atomicio(ssize_t (*f)(), int fd, void *_s, size_t n)
{
char *s = _s;
ssize_t res, pos = 0;
while (n > pos) {
res = (f) (fd, s + pos, n - pos);
switch (res) {
case -1:
#ifdef EWOULDBLOCK
if (errno == EINTR || errno == EAGAIN
|| errno == EWOULDBLOCK)
#else
if (errno == EINTR || errno == EAGAIN)
#endif
continue;
case 0:
return (res);
default:
pos += res;
}
}
return (pos);
}