cregit-Linux how code gets into the kernel

Release 4.11 fs/cifs/dns_resolve.c

Directory: fs/cifs
/*
 *  fs/cifs/dns_resolve.c
 *
 *   Copyright (c) 2007 Igor Mammedov
 *   Author(s): Igor Mammedov (niallain@gmail.com)
 *              Steve French (sfrench@us.ibm.com)
 *              Wang Lei (wang840925@gmail.com)
 *              David Howells (dhowells@redhat.com)
 *
 *   Contains the CIFS DFS upcall routines used for hostname to
 *   IP address translation.
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/slab.h>
#include <linux/dns_resolver.h>
#include "dns_resolve.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"

/**
 * dns_resolve_server_name_to_ip - Resolve UNC server name to ip address.
 * @unc: UNC path specifying the server (with '/' as delimiter)
 * @ip_addr: Where to return the IP address.
 *
 * The IP address will be returned in string form, and the caller is
 * responsible for freeing it.
 *
 * Returns length of result on success, -ve on error.
 */

int dns_resolve_server_name_to_ip(const char *unc, char **ip_addr) { struct sockaddr_storage ss; const char *hostname, *sep; char *name; int len, rc; if (!ip_addr || !unc) return -EINVAL; len = strlen(unc); if (len < 3) { cifs_dbg(FYI, "%s: unc is too short: %s\n", __func__, unc); return -EINVAL; } /* Discount leading slashes for cifs */ len -= 2; hostname = unc + 2; /* Search for server name delimiter */ sep = memchr(hostname, '/', len); if (sep) len = sep - hostname; else cifs_dbg(FYI, "%s: probably server name is whole unc: %s\n", __func__, unc); /* Try to interpret hostname as an IPv4 or IPv6 address */ rc = cifs_convert_address((struct sockaddr *)&ss, hostname, len); if (rc > 0) goto name_is_IP_address; /* Perform the upcall */ rc = dns_query(NULL, hostname, len, NULL, ip_addr, NULL); if (rc < 0) cifs_dbg(FYI, "%s: unable to resolve: %*.*s\n", __func__, len, len, hostname); else cifs_dbg(FYI, "%s: resolved: %*.*s to %s\n", __func__, len, len, hostname, *ip_addr); return rc; name_is_IP_address: name = kmalloc(len + 1, GFP_KERNEL); if (!name) return -ENOMEM; memcpy(name, hostname, len); name[len] = 0; cifs_dbg(FYI, "%s: unc is IP, skipping dns upcall: %s\n", __func__, name); *ip_addr = name; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steve French11241.79%325.00%
Wang Lei8531.72%18.33%
David Howells3613.43%216.67%
Joe Perches248.96%216.67%
Igor Mammedov72.61%18.33%
Harvey Harrison20.75%18.33%
Jeff Layton20.75%216.67%
Total268100.00%12100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Steve French12643.75%323.08%
Wang Lei8730.21%17.69%
David Howells3612.50%215.38%
Joe Perches248.33%215.38%
Igor Mammedov72.43%17.69%
Tejun Heo31.04%17.69%
Jeff Layton31.04%215.38%
Harvey Harrison20.69%17.69%
Total288100.00%13100.00%
Directory: fs/cifs
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