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Diffstat (limited to 'src/mhd/mhd_config.c')
| -rw-r--r-- | src/mhd/mhd_config.c | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/src/mhd/mhd_config.c b/src/mhd/mhd_config.c new file mode 100644 index 000000000..d4b0e9795 --- /dev/null +++ b/src/mhd/mhd_config.c @@ -0,0 +1,396 @@ +/* + This file is part of TALER + Copyright (C) 2014--2019 Taler Systems SA + + TALER is free software; you can redistribute it and/or modify it under the + terms of the GNU Affero General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + TALER 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 Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License along with + TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file mhd_config.c + * @brief functions to configure and setup MHD + * @author Florian Dold + * @author Benedikt Mueller + * @author Christian Grothoff + */ +#include "platform.h" +#include <gnunet/gnunet_util_lib.h> +#include "taler_mhd_lib.h" + + +/** + * Backlog for listen operation on UNIX domain sockets. + */ +#define UNIX_BACKLOG 500 + + +/** + * Parse the configuration to determine on which port + * or UNIX domain path we should run an HTTP service. + * + * @param cfg configuration to parse + * @param section section of the configuration to parse (usually "exchange") + * @param[out] rport set to the port number, or 0 for none + * @param[out] unix_path set to the UNIX path, or NULL for none + * @param[out] unix_mode set to the mode to be used for @a unix_path + * @return #GNUNET_OK on success + */ +int +TALER_MHD_parse_config (const struct GNUNET_CONFIGURATION_Handle *cfg, + const char *section, + uint16_t *rport, + char **unix_path, + mode_t *unix_mode) +{ + const char *choices[] = {"tcp", "unix"}; + const char *serve_type; + unsigned long long port; + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_choice (cfg, + section, + "serve", + choices, + &serve_type)) + { + GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, + section, + "serve", + "serve type required"); + return GNUNET_SYSERR; + } + + if (0 == strcasecmp (serve_type, "tcp")) + { + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_number (cfg, + section, + "port", + &port)) + { + GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, + section, + "port", + "port number required"); + return GNUNET_SYSERR; + } + + if ( (0 == port) || + (port > UINT16_MAX) ) + { + GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, + section, + "port", + "value not in [1,65535]"); + return GNUNET_SYSERR; + } + *rport = (uint16_t) port; + *unix_path = NULL; + return GNUNET_OK; + } + if (0 == strcmp (serve_type, "unix")) + { + struct sockaddr_un s_un; + char *modestring; + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_filename (cfg, + section, + "unixpath", + unix_path)) + { + GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, + section, + "unixpath", + "unixpath required"); + return GNUNET_SYSERR; + } + if (strlen (*unix_path) >= sizeof (s_un.sun_path)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "unixpath `%s' is too long\n", + *unix_path); + return GNUNET_SYSERR; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_string (cfg, + section, + "UNIXPATH_MODE", + &modestring)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + section, + "UNIXPATH_MODE"); + return GNUNET_SYSERR; + } + errno = 0; + *unix_mode = (mode_t) strtoul (modestring, NULL, 8); + if (0 != errno) + { + GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, + section, + "UNIXPATH_MODE", + "must be octal number"); + GNUNET_free (modestring); + return GNUNET_SYSERR; + } + GNUNET_free (modestring); + return GNUNET_OK; + } + /* not reached */ + GNUNET_assert (0); + return GNUNET_SYSERR; +} + + +/** + * Function called for logging by MHD. + * + * @param cls closure, NULL + * @param fm format string (`printf()`-style) + * @param ap arguments to @a fm + */ +void +TALER_MHD_handle_logs (void *cls, + const char *fm, + va_list ap) +{ + static int cache; + char buf[2048]; + + (void) cls; + if (-1 == cache) + return; + if (0 == cache) + { + if (0 == + GNUNET_get_log_call_status (GNUNET_ERROR_TYPE_INFO, + "libmicrohttpd", + __FILE__, + __FUNCTION__, + __LINE__)) + { + cache = -1; + return; + } + } + cache = 1; + vsnprintf (buf, + sizeof (buf), + fm, + ap); + GNUNET_log_from_nocheck (GNUNET_ERROR_TYPE_INFO, + "libmicrohttpd", + "%s", + buf); +} + + +/** + * Open UNIX domain socket for listining at @a unix_path with + * permissions @a unix_mode. + * + * @param unix_path where to listen + * @param unix_mode access permissions to set + * @return -1 on error, otherwise the listen socket + */ +int +TALER_MHD_open_unix_path (const char *unix_path, + mode_t unix_mode) +{ + struct GNUNET_NETWORK_Handle *nh; + struct sockaddr_un *un; + int fd; + + if (sizeof (un->sun_path) <= strlen (unix_path)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "unixpath `%s' is too long\n", + unix_path); + return -1; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Creating listen socket '%s' with mode %o\n", + unix_path, + unix_mode); + + if (GNUNET_OK != + GNUNET_DISK_directory_create_for_file (unix_path)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "mkdir", + unix_path); + } + + un = GNUNET_new (struct sockaddr_un); + un->sun_family = AF_UNIX; + strncpy (un->sun_path, + unix_path, + sizeof (un->sun_path) - 1); + GNUNET_NETWORK_unix_precheck (un); + + if (NULL == (nh = GNUNET_NETWORK_socket_create (AF_UNIX, + SOCK_STREAM, + 0))) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, + "socket"); + GNUNET_free (un); + return -1; + } + if (GNUNET_OK != + GNUNET_NETWORK_socket_bind (nh, + (void *) un, + sizeof (struct sockaddr_un))) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "bind", + unix_path); + GNUNET_free (un); + GNUNET_NETWORK_socket_close (nh); + return -1; + } + GNUNET_free (un); + if (GNUNET_OK != + GNUNET_NETWORK_socket_listen (nh, + UNIX_BACKLOG)) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, + "listen"); + GNUNET_NETWORK_socket_close (nh); + return -1; + } + + if (0 != chmod (unix_path, + unix_mode)) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, + "chmod"); + GNUNET_NETWORK_socket_close (nh); + return -1; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "set socket '%s' to mode %o\n", + unix_path, + unix_mode); + fd = GNUNET_NETWORK_get_fd (nh); + GNUNET_NETWORK_socket_free_memory_only_ (nh); + return fd; +} + + +/** + * Bind a listen socket to the UNIX domain path + * or the TCP port and IP address as specified + * in @a cfg in section @a section. IF only a + * port was specified, set @a port and return -1. + * Otherwise, return the bound file descriptor. + * + * @param cfg configuration to parse + * @param section configuration section to use + * @param port[out] port to set, if TCP without BINDTO + * @return -1 and a port of zero on error, otherwise + * either -1 and a port, or a bound stream socket + */ +int +TALER_MHD_bind (const struct GNUNET_CONFIGURATION_Handle *cfg, + const char *section, + uint16_t *port) +{ + char *bind_to; + char *serve_unixpath; + mode_t unixpath_mode; + int fh; + char port_str[6]; + struct addrinfo hints; + struct addrinfo *res; + int ec; + struct GNUNET_NETWORK_Handle *nh; + + *port = 0; + if (GNUNET_OK != + TALER_MHD_parse_config (cfg, + section, + port, + &serve_unixpath, + &unixpath_mode)) + return -1; + if (NULL != serve_unixpath) + return TALER_MHD_open_unix_path (serve_unixpath, + unixpath_mode); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_string (cfg, + section, + "BIND_TO", + &bind_to)) + return -1; /* only set port */ + /* let's have fun binding... */ + GNUNET_snprintf (port_str, + sizeof (port_str), + "%u", + (unsigned int) *port); + *port = 0; /* do NOT return port in case of errors */ + memset (&hints, 0, sizeof (hints)); + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = IPPROTO_TCP; + hints.ai_flags = AI_PASSIVE +#ifdef AI_IDN + | AI_IDN +#endif + ; + if (0 != + (ec = getaddrinfo (bind_to, + port_str, + &hints, + &res))) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Failed to resolve BIND_TO address `%s': %s\n", + bind_to, gai_strerror (ec)); + GNUNET_free (bind_to); + return -1; + } + GNUNET_free (bind_to); + + if (NULL == (nh = GNUNET_NETWORK_socket_create (res->ai_family, + res->ai_socktype, + res->ai_protocol))) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, + "socket"); + freeaddrinfo (res); + return -1; + } + if (GNUNET_OK != + GNUNET_NETWORK_socket_bind (nh, + res->ai_addr, + res->ai_addrlen)) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, + "bind"); + freeaddrinfo (res); + return -1; + } + freeaddrinfo (res); + if (GNUNET_OK != + GNUNET_NETWORK_socket_listen (nh, + UNIX_BACKLOG)) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, + "listen"); + GNUNET_SCHEDULER_shutdown (); + return -1; + } + fh = GNUNET_NETWORK_get_fd (nh); + GNUNET_NETWORK_socket_free_memory_only_ (nh); + return fh; +} |