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/*
* Copyright (C) 2003-2006 by CERN/IT/GD/CT
* All rights reserved
*/
#ifndef lint
static char sccsid[] = "@(#)$RCSfile: Cns_readlink.c,v $ $Revision: 1.2 $ $Date: 2006/08/01 12:41:12 $ CERN IT-GD/CT Jean-Philippe Baud";
#endif /* not lint */
/* Cns_readlink - read value of symbolic link */
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#if defined(_WIN32)
#include <winsock2.h>
#else
#include <unistd.h>
#include <netinet/in.h>
#endif
#include "marshall.h"
#include "Cns_api.h"
#include "Cns.h"
#include "serrno.h"
int DLL_DECL
Cns_readlink(const char *path, char *buf, size_t bufsiz)
{
char *actual_path;
int c;
char func[16];
gid_t gid;
int msglen;
char *p;
char *q;
char *sbp;
char sendbuf[REQBUFSZ];
char server[CA_MAXHOSTNAMELEN+1];
struct Cns_api_thread_info *thip;
uid_t uid;
strcpy (func, "Cns_readlink");
if (Cns_apiinit (&thip))
return (-1);
uid = geteuid();
gid = getegid();
#if defined(_WIN32)
if (uid < 0 || gid < 0) {
Cns_errmsg (func, NS053);
serrno = SENOMAPFND;
return (-1);
}
#endif
if (! path || ! buf) {
serrno = EFAULT;
return (-1);
}
if (strlen (path) > CA_MAXPATHLEN) {
serrno = ENAMETOOLONG;
return (-1);
}
if (Cns_selectsrvr (path, thip->server, server, &actual_path))
return (-1);
/* Build request header */
sbp = sendbuf;
marshall_LONG (sbp, CNS_MAGIC);
marshall_LONG (sbp, CNS_READLINK);
q = sbp; /* save pointer. The next field will be updated */
msglen = 3 * LONGSIZE;
marshall_LONG (sbp, msglen);
/* Build request body */
marshall_LONG (sbp, uid);
marshall_LONG (sbp, gid);
marshall_HYPER (sbp, thip->cwd);
marshall_STRING (sbp, actual_path);
msglen = sbp - sendbuf;
marshall_LONG (q, msglen); /* update length field */
c = send2nsd (NULL, server, sendbuf, msglen, buf, bufsiz);
if (c == 0) {
if (p = memchr (buf, '\0', bufsiz))
c = p - buf + 1;
else
c = bufsiz;
}
if (c < 0 && serrno == SENAMETOOLONG) serrno = ENAMETOOLONG;
return (c);
}
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