//

// HTTP address routines for CUPS.

//

// Copyright © 2021-2024 by OpenPrinting.

// Copyright © 2007-2021 by Apple Inc.

// Copyright © 1997-2006 by Easy Software Products, all rights reserved.

//

// Licensed under Apache License v2.0.  See the file "LICENSE" for more

// information.

//

#include "cups-private.h"

#include <sys/stat.h>

#ifdef HAVE_RESOLV_H

#  include <resolv.h>

#endif // HAVE_RESOLV_H

#ifdef __APPLE__

#  include <CoreFoundation/CoreFoundation.h>

#  ifdef HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME

#    include <SystemConfiguration/SystemConfiguration.h>

#  endif // HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME

#endif // __APPLE__

//

// 'httpAddrClose()' - Close a socket created by @link httpAddrConnect@ or

//                     @link httpAddrListen@.

//

// Pass `NULL` for sockets created with @link httpAddrConnect@ and the

// listen address for sockets created with @link httpAddrListen@.  This function

// ensures that domain sockets are removed when closed.

//

bool          // O - `true` on success, `false` on failure

httpAddrClose(http_addr_t *addr,  // I - Listen address or `NULL`

              int         fd)   // I - Socket file descriptor

{

#ifdef _WIN32

  if (closesocket(fd))

#else

  if (close(fd))

#endif // _WIN32

    return (false);

#ifdef AF_LOCAL

  if (addr && addr->addr.sa_family == AF_LOCAL)

    return (!unlink(addr->un.sun_path));

#endif // AF_LOCAL

  return (true);

}

//

// 'httpGetAddress()' - Get the address of the connected peer of a connection.

//

// For connections created with @link httpConnect2@, the address is for the

// server.  For connections created with @link httpAccept@, the address is for

// the client.

//

// Returns `NULL` if the socket is currently unconnected.

//

http_addr_t *       // O - Connected address or `NULL`

httpGetAddress(http_t *http)    // I - HTTP connection

{

  return (http ? http->hostaddr : NULL);

}

//

// 'httpAddrGetFamily()' - Get the address family of an address.

//

int         // O - Address family

httpAddrGetFamily(http_addr_t *addr)  // I - Address

{

  if (addr)

    return (addr->addr.sa_family);

  else

    return (0);

}

//

// 'httpAddrGetLength()' - Return the length of the address in bytes.

//

size_t          // O - Length in bytes

httpAddrGetLength(

    const http_addr_t *addr)    // I - Address

{

  if (!addr)

    return (0);

#ifdef AF_INET6

  if (addr->addr.sa_family == AF_INET6)

    return (sizeof(addr->ipv6));

  else

#endif // AF_INET6

#ifdef AF_LOCAL

  if (addr->addr.sa_family == AF_LOCAL)

    return (offsetof(struct sockaddr_un, sun_path) + strlen(addr->un.sun_path) + 1);

  else

#endif // AF_LOCAL

  if (addr->addr.sa_family == AF_INET)

    return (sizeof(addr->ipv4));

  else

    return (0);

}

//

// 'httpAddrGetPort()' - Get the port number associated with an address.

//

int         // O - Port number

httpAddrGetPort(http_addr_t *addr)  // I - Address

{

  if (!addr)

    return (-1);

#ifdef AF_INET6

  else if (addr->addr.sa_family == AF_INET6)

    return (ntohs(addr->ipv6.sin6_port));

#endif // AF_INET6

  else if (addr->addr.sa_family == AF_INET)

    return (ntohs(addr->ipv4.sin_port));

  else

    return (0);

}

//

// 'httpAddrGetString()' - Convert an address to a numeric string.

//

char *          // O - Numeric address string

httpAddrGetString(

    const http_addr_t *addr,    // I - Address to convert

    char              *s,   // I - String buffer

    size_t            slen)   // I - Length of string buffer

{

  DEBUG_printf("httpAddrGetString(addr=%p, s=%p, slen=%u)", (void *)addr, (void *)s, (unsigned)slen);

  // Range check input...

  if (!addr || !s || slen <= 2)

  {

    if (s && slen >= 1)

      *s = '\0';

    return (NULL);

  }

#ifdef AF_LOCAL

  if (addr->addr.sa_family == AF_LOCAL)

  {

    if (addr->un.sun_path[0] == '/')

      cupsCopyString(s, addr->un.sun_path, (size_t)slen);

    else

      cupsCopyString(s, "localhost", (size_t)slen);

  }

  else

#endif // AF_LOCAL

  if (addr->addr.sa_family == AF_INET)

  {

    unsigned temp;      // Temporary address

    temp = ntohl(addr->ipv4.sin_addr.s_addr);

    snprintf(s, (size_t)slen, "%d.%d.%d.%d", (temp >> 24) & 255, (temp >> 16) & 255, (temp >> 8) & 255, temp & 255);

  }

#ifdef AF_INET6

  else if (addr->addr.sa_family == AF_INET6)

  {

    char  *sptr,      // Pointer into string

    temps[64];    // Temporary string for address

    if (getnameinfo(&addr->addr, (socklen_t)httpAddrGetLength(addr), temps, sizeof(temps), NULL, 0, NI_NUMERICHOST))

    {

      // If we get an error back, then the address type is not supported

      // and we should zero out the buffer...

      s[0] = '\0';

      return (NULL);

    }

    else if ((sptr = strchr(temps, '%')) != NULL)

    {

      // Convert "%zone" to "+zone" to match URI form...

      *sptr = '+';

    }

    // Add "[v1." and "]" around IPv6 address to convert to URI form.

    snprintf(s, (size_t)slen, "[v1.%s]", temps);

  }

#endif // AF_INET6

  else

  {

    cupsCopyString(s, "UNKNOWN", (size_t)slen);

  }

  DEBUG_printf("2httpAddrGetString: returning \"%s\"...", s);

  return (s);

}

//

// 'httpAddrIsAny()' - Check for the "any" address.

//

bool          // O - `true` if "any", `false` otherwise

httpAddrIsAny(const http_addr_t *addr)  // I - Address to check

{

  if (!addr)

    return (false);

#ifdef AF_INET6

  if (addr->addr.sa_family == AF_INET6 && IN6_IS_ADDR_UNSPECIFIED(&(addr->ipv6.sin6_addr)))

    return (true);

#endif // AF_INET6

  if (addr->addr.sa_family == AF_INET && ntohl(addr->ipv4.sin_addr.s_addr) == 0x00000000)

    return (true);

  return (false);

}

//

// 'httpAddrIsEqual()' - Compare two addresses.

//

bool          // O - `true` if equal, `false` if not

httpAddrIsEqual(

    const http_addr_t *addr1,   // I - First address

    const http_addr_t *addr2)   // I - Second address

{

  if (!addr1 && !addr2)

    return (true);

  if (!addr1 || !addr2)

    return (false);

  if (addr1->addr.sa_family != addr2->addr.sa_family)

    return (false);

#ifdef AF_LOCAL

  if (addr1->addr.sa_family == AF_LOCAL)

    return (!strcmp(addr1->un.sun_path, addr2->un.sun_path));

#endif // AF_LOCAL

#ifdef AF_INET6

  if (addr1->addr.sa_family == AF_INET6)

    return (!memcmp(&(addr1->ipv6.sin6_addr), &(addr2->ipv6.sin6_addr), 16));

#endif // AF_INET6

  return (addr1->ipv4.sin_addr.s_addr == addr2->ipv4.sin_addr.s_addr);

}

//

// 'httpAddrIsLocalhost()' - Check for the local loopback address.

//

bool          // O - `true` if local host, `false` otherwise

httpAddrIsLocalhost(

    const http_addr_t *addr)    // I - Address to check

{

  if (!addr)

    return (true);

#ifdef AF_INET6

  if (addr->addr.sa_family == AF_INET6 && IN6_IS_ADDR_LOOPBACK(&(addr->ipv6.sin6_addr)))

    return (true);

#endif // AF_INET6

#ifdef AF_LOCAL

  if (addr->addr.sa_family == AF_LOCAL)

    return (true);

#endif // AF_LOCAL

  if (addr->addr.sa_family == AF_INET && (ntohl(addr->ipv4.sin_addr.s_addr) & 0xff000000) == 0x7f000000)

    return (true);

  return (false);

}

//

// 'httpAddrListen()' - Create a listening socket bound to the specified address and port.

//

int         // O - Socket or `-1` on error

httpAddrListen(http_addr_t *addr, // I - Address to bind to

               int         port)  // I - Port number to bind to

{

  int   fd = -1,    // Socket

    val,      // Socket value

                status;     // Bind status

  // Range check input...

  if (!addr || port < 0)

    return (-1);

  // Make sure the network stack is initialized...

  httpInitialize();

  // Create the socket and set options...

  if ((fd = socket(addr->addr.sa_family, SOCK_STREAM, 0)) < 0)

  {

    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), false);

    return (-1);

  }

  val = 1;

  if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, CUPS_SOCAST &val, sizeof(val)))

    DEBUG_printf("2httpAddrListen: setsockopt(SO_REUSEADDR) failed: %s", strerror(errno));

#ifdef IPV6_V6ONLY

  if (addr->addr.sa_family == AF_INET6)

  {

    if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, CUPS_SOCAST &val, sizeof(val)))

      DEBUG_printf("2httpAddrListen: setsockopt(IPv6_V6ONLY) failed: %s", strerror(errno));

  }

#endif // IPV6_V6ONLY

  // Bind the socket...

#ifdef AF_LOCAL

  if (addr->addr.sa_family == AF_LOCAL)

  {

    mode_t  mask;     // Umask setting

    // Remove any existing domain socket file...

    if ((status = unlink(addr->un.sun_path)) < 0)

    {

      if (errno == ENOENT)

        status = 0;

      else

        DEBUG_printf("2httpAddrListen: Unable to unlink '%s': %s",

addr->un.sun_path, strerror(errno));

    }

    if (!status)

    {

      // Save the current umask and set it to 0 so that all users can access

      // the domain socket...

      mask = umask(0);

      // Bind the domain socket...

      if ((status = bind(fd, (struct sockaddr *)addr, (socklen_t)httpAddrGetLength(addr))) < 0)

  DEBUG_printf("1httpAddrListen: Unable to bind domain socket \"%s\": %s", addr->un.sun_path, strerror(errno));

      // Restore the umask and fix permissions...

      umask(mask);

    }

  }

  else

#endif // AF_LOCAL

  {

    httpAddrSetPort(addr, port);

    if ((status = bind(fd, (struct sockaddr *)addr, (socklen_t)httpAddrGetLength(addr))) < 0)

      DEBUG_printf("1httpAddrListen: Unable to bind network socket: %s", strerror(errno));

  }

  if (status)

  {

    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), false);

    close(fd);

    return (-1);

  }

  // Listen...

  if (listen(fd, INT_MAX))

  {

    DEBUG_printf("1httpAddrListen: Unable to listen on socket: %s", strerror(errno));

    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), false);

    close(fd);

    return (-1);

  }

  // Close on exec...

#ifndef _WIN32

  if (fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC))

    DEBUG_printf("2httpAddrListen: fcntl(F_SETFD, FD_CLOEXEC) failed: %s", strerror(errno));

#endif // !_WIN32

#ifdef SO_NOSIGPIPE

  // Disable SIGPIPE for this socket.

  val = 1;

  if (setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, CUPS_SOCAST &val, sizeof(val)))

    DEBUG_printf("2httpAddrListen: setsockopt(SO_NOSIGPIPE) failed: %s", strerror(errno));

#endif // SO_NOSIGPIPE

  return (fd);

}

//

// 'httpAddrLookup()' - Lookup the hostname associated with the address.

//

char *          // O - Host name

httpAddrLookup(

    const http_addr_t *addr,    // I - Address to lookup

    char              *name,    // I - Host name buffer

    size_t            namelen)    // I - Size of name buffer

{

  _cups_globals_t *cg = _cupsGlobals();

          // Global data

  DEBUG_printf("httpAddrLookup(addr=%p, name=%p, namelen=%u)", (void *)addr, (void *)name, (unsigned)namelen);

  // Range check input...

  if (!addr || !name || namelen <= 2)

  {

    if (name && namelen >= 1)

      *name = '\0';

    return (NULL);

  }

#ifdef AF_LOCAL

  if (addr->addr.sa_family == AF_LOCAL)

  {

    cupsCopyString(name, addr->un.sun_path, (size_t)namelen);

    return (name);

  }

#endif // AF_LOCAL

  // Optimize lookups for localhost/loopback addresses...

  if (httpAddrIsLocalhost(addr))

  {

    cupsCopyString(name, "localhost", (size_t)namelen);

    return (name);

  }

#ifdef HAVE_RES_INIT

  // If the previous lookup failed, re-initialize the resolver to prevent

  // temporary network errors from persisting.  This *should* be handled by

  // the resolver libraries, but apparently the glibc folks do not agree.

  //

  // We set a flag at the end of this function if we encounter an error that

  // requires reinitialization of the resolver functions.  We then call

  // res_init() if the flag is set on the next call here or in httpAddrLookup().

  if (cg->need_res_init)

  {

    res_init();

    cg->need_res_init = 0;

  }

#endif // HAVE_RES_INIT

  // Fall back on httpAddrGetString if getnameinfo fails...

  int error = getnameinfo(&addr->addr, (socklen_t)httpAddrGetLength(addr), name, (socklen_t)namelen, NULL, 0, 0);

  if (error)

  {

    if (error == EAI_FAIL)

      cg->need_res_init = 1;

    return (httpAddrGetString(addr, name, namelen));

  }

  DEBUG_printf("2httpAddrLookup: returning \"%s\"...", name);

  return (name);

}

//

// 'httpGetHostname()' - Get the FQDN for the connection or local system.

//

// When "http" points to a connected socket, return the hostname or address that

// was used in the call to @link httpConnect@ or the address of the client for

// the connection from @link httpAcceptConnection@.

//

// When "http" is `NULL`, return the FQDN for the local system.

//

const char *        // O - FQDN for connection or system

httpGetHostname(http_t *http,   // I - HTTP connection or NULL

                char   *s,    // I - String buffer for name

                size_t slen)    // I - Size of buffer

{

  if (http)

  {

    // Return the connection address...

    if (!s || slen <= 1)

    {

      if (http->hostname[0] == '/')

  return ("localhost");

      else

  return (http->hostname);

    }

    else if (http->hostname[0] == '/')

    {

      cupsCopyString(s, "localhost", (size_t)slen);

    }

    else

    {

      cupsCopyString(s, http->hostname, (size_t)slen);

    }

  }

  else

  {

    // Return the hostname...

    if (!s || slen <= 1)

      return (NULL);

    if (gethostname(s, (size_t)slen) < 0)

      cupsCopyString(s, "localhost", (size_t)slen);

    DEBUG_printf("1httpGetHostname: gethostname() returned \"%s\".", s);

    if (!strchr(s, '.'))

    {

#ifdef HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME

      // The hostname is not a FQDN, so use the local hostname from the

      // SystemConfiguration framework...

      SCDynamicStoreRef sc = SCDynamicStoreCreate(kCFAllocatorDefault, CFSTR("libcups"), NULL, NULL);

          // System configuration data

      CFStringRef local = sc ? SCDynamicStoreCopyLocalHostName(sc) : NULL;

          // Local host name

      char    localStr[1024]; // Local host name C string

      if (local && CFStringGetCString(local, localStr, sizeof(localStr), kCFStringEncodingUTF8))

      {

        // Append ".local." to the hostname we get...

        snprintf(s, (size_t)slen, "%s.local.", localStr);

        DEBUG_printf("1httpGetHostname: SCDynamicStoreCopyLocalHostName() returned \"%s\".", s);

      }

      if (local)

        CFRelease(local);

      if (sc)

        CFRelease(sc);

#else

      // The hostname is not a FQDN, so look it up...

      struct hostent  *host;    // Host entry to get FQDN

      if ((host = gethostbyname(s)) != NULL && host->h_name)

      {

        // Use the resolved hostname...

  cupsCopyString(s, host->h_name, (size_t)slen);

        DEBUG_printf("1httpGetHostname: gethostbyname() returned \"%s\".", s);

      }

#endif // HAVE_SCDYNAMICSTORECOPYCOMPUTERNAME

    }

    // Make sure .local hostnames end with a period...

    if (strlen(s) > 6 && !strcmp(s + strlen(s) - 6, ".local"))

      cupsConcatString(s, ".", (size_t)slen);

  }

  // Convert the hostname to lowercase as needed...

  if (s[0] != '/')

  {

    char  *ptr;     // Pointer into string

    for (ptr = s; *ptr; ptr ++)

      *ptr = (char)_cups_tolower((int)*ptr);

  }

  // Return the hostname with as much domain info as we have...

  return (s);

}

//

// 'httpResolveHostname()' - Resolve the hostname of the HTTP connection

//                           address.

//

const char *        // O - Resolved hostname or `NULL`

httpResolveHostname(http_t *http, // I - HTTP connection

                    char   *buffer, // I - Hostname buffer or `NULL` to use HTTP buffer

                    size_t bufsize) // I - Size of buffer

{

  if (!http)

    return (NULL);

  if (isdigit(http->hostname[0] & 255) || http->hostname[0] == '[')

  {

    char  temp[1024];   // Temporary string

    if (httpAddrLookup(http->hostaddr, temp, sizeof(temp)))

      cupsCopyString(http->hostname, temp, sizeof(http->hostname));

    else

      return (NULL);

  }

  if (buffer)

  {

    if (http->hostname[0] == '/')

      cupsCopyString(buffer, "localhost", bufsize);

    else

      cupsCopyString(buffer, http->hostname, bufsize);

    return (buffer);

  }

  else if (http->hostname[0] == '/')

  {

    return ("localhost");

  }

  else

  {

    return (http->hostname);

  }

}

//

// 'httpAddrSetPort()' - Set the port number associated with an address.

//

void

httpAddrSetPort(http_addr_t *addr,  // I - Address

                int         port) // I - Port

{

  if (!addr || port <= 0)

    return;

#ifdef AF_INET6

  if (addr->addr.sa_family == AF_INET6)

    addr->ipv6.sin6_port = htons(port);

  else

#endif // AF_INET6

  if (addr->addr.sa_family == AF_INET)

    addr->ipv4.sin_port = htons(port);

}