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#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <pwd.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <signal.h>
#include <config.h>
#include <support.h>
#include <xcio.h>
#ifndef LOG_PPXP
#define LOG_PPXP LOG_LOCAL0
#endif
static char *
CallIdent(struct sockaddr_in *sap)
{
struct servent *sp;
FILE *ofp, *ifp;
char *p, buf[80];
int sd, len;
unsigned short pport, mport;
pport = ntohs(sap->sin_port);
sap->sin_family = AF_INET;
sap->sin_port = (sp = getservbyname("ident", "tcp")) != NULL ?
sp->s_port: htons(113);
len = sizeof(*sap);
if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
syslog(LOG_PPXP|LOG_ERR, "can not open socket");
return(NULL);
}
if (connect(sd, (struct sockaddr *)sap, len) < 0) {
syslog(LOG_PPXP|LOG_ERR, "can not connect to identd");
return(NULL);
}
if (getsockname(0, (struct sockaddr *)sap, &len) < 0) {
syslog(LOG_PPXP|LOG_ERR, "can not get socket");
return(NULL);
}
mport = ntohs(sap->sin_port);
ifp = fdopen(sd, "r");
ofp = fdopen(sd, "w");
fprintf(ofp, "%d , %d\n", pport, mport);
fflush(ofp);
shutdown(sd, 1);
fgets(buf, sizeof(buf), ifp);
fclose(ofp);
fclose(ifp);
close(sd);
if ((p = strpbrk(buf, "\r\n")) != NULL) *p = '\0';
if ((p = strrchr(buf, ':')) != NULL) *p ++;
while (*p && *p == ' ') p ++;
return(Strdup(p));
}
char *
CheckRemote()
{
int sd;
size_t len;
unsigned i;
struct sockaddr_in sa;
struct hostent *hp;
unsigned int laddr, raddr;
struct passwd *pwp;
FILE *fp;
uid_t uid;
char buf[80], addr[16], luser[40], *ruser, *p;
len = sizeof(sa);
memset(&sa, 0, len);
if (getpeername(0, (struct sockaddr *)&sa, &len) < 0) {
syslog(LOG_PPXP|LOG_ERR, "can not get peer");
return(NULL);
}
raddr = sa.sin_addr.s_addr;
uid = getuid();
if (uid) {
if ((pwp = getpwuid(uid)) == NULL) {
syslog(LOG_PPXP|LOG_ERR, "unknown user(%d)", uid);
return(NULL);
}
ruser = Strdup(pwp->pw_name);
} else {
ruser = CallIdent(&sa);
if ((pwp = getpwnam(ruser)) == NULL) {
syslog(LOG_PPXP|LOG_ERR, "unknown user(%s)", ruser);
return(NULL);
}
}
if ((fp = fopen(RUSERS, "r")) == NULL) {
syslog(LOG_PPXP|LOG_ERR, "can not open %s", RUSERS);
return(NULL);
}
laddr = INADDR_NONE;
while (fgets(buf, sizeof(buf), fp)) {
luser[0] = '\0';
sscanf(buf, "%s %s", addr, luser);
if (((laddr = inet_addr(addr)) == INADDR_NONE)) {
if ((hp = gethostbyname(addr)) == NULL) continue;
for (i = 0; i < hp->h_length/sizeof(laddr); i ++) {
laddr = *(unsigned int *)hp->h_addr_list[i];
if (laddr == raddr) break;
}
}
if (laddr == raddr
&& (!luser[0] || !strcmp(ruser, luser))) break;
}
if (laddr == raddr) {
struct passwd *pw;
char *user;
user = (luser[0]) ? luser: ruser;
if ((pw = getpwnam(user)) == NULL) {
syslog(LOG_PPXP|LOG_ERR, "%s: unknown user", user);
return(NULL);
}
setgid(pw->pw_gid);
setuid(pw->pw_uid);
sprintf(buf, "%s@%s", ruser, addr);
syslog(LOG_PPXP|LOG_INFO, "connect from %s", buf);
free(ruser);
return(strdup(buf));
}
syslog(LOG_PPXP|LOG_ERR, "permission denied");
return(NULL);
}
static void
PPxPBridge(int fd)
{
int maxfd, n;
fd_set rfds, orfds;
char buf[BUFSIZ];
FD_ZERO(&orfds);
FD_SET(0, &orfds);
FD_SET(fd, &orfds);
maxfd = fd + 1;
while (1) {
rfds = orfds;
n = select(maxfd, &rfds, NULL, NULL, NULL);
if (n <= 0 && errno == EINTR) continue;
if (FD_ISSET(fd, &rfds)) {
n = read(fd, buf, sizeof(buf));
if (n > 0) write(0, buf, n);
else if (errno != EINTR) exit(0);
}
if (FD_ISSET(0, &rfds)) {
n = read(0, buf, sizeof(buf));
if (n > 0) write(fd, buf, n);
else if (errno != EINTR) exit(0);
}
}
}
int
main(int argc, char *argv[])
{
int ifnum, fd, n;
struct xcio_s hello;
char *name, *rname;
uid_t uid;
int httpMode=0;
openlog(argv[0], LOG_PID, LOG_PPXP);
if (isatty(0)) rname = "debugger";
else if ((rname = CheckRemote()) == NULL) exit(-1);
DirNameInit(getuid());
n = read(0, &hello.type, sizeof(hello.type));
if (hello.type != XCIO_HELLO) {
SysMsgInit();
ifnum = 0;
httpMode = 1;
sprintf(hello.buf, "http (%s)", rname);
HttpdMain(rname, hello.type);
} else {
n = read(0, &hello + sizeof(hello.type),
sizeof(hello) - sizeof(hello.type));
ifnum = hello.buf[hello.len];
name = strdup(hello.buf);
sprintf(hello.buf, "%s (%s)", name, rname);
free(name);
if ((fd = PPxPLocalOpen(&ifnum)) < 0) exit(-1);
hello.len = strlen(hello.buf) + 1;
uid = getuid();
memcpy(hello.buf + hello.len, &uid, sizeof(uid));
hello.len += sizeof(uid);
write(fd, &hello, sizeof(hello));
PPxPBridge(fd);
}
return(0);
}
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