From 0e752a6e215aee21dc73da097c3225495d54a5b6 Mon Sep 17 00:00:00 2001 From: SoniEx2 Date: Fri, 9 Apr 2021 07:19:03 -0300 Subject: Add libotr/etc sources --- libotr/libgcrypt-1.8.7/random/rndegd.c | 290 +++++++++++++++++++++++++++++++++ 1 file changed, 290 insertions(+) create mode 100644 libotr/libgcrypt-1.8.7/random/rndegd.c (limited to 'libotr/libgcrypt-1.8.7/random/rndegd.c') diff --git a/libotr/libgcrypt-1.8.7/random/rndegd.c b/libotr/libgcrypt-1.8.7/random/rndegd.c new file mode 100644 index 0000000..b87115f --- /dev/null +++ b/libotr/libgcrypt-1.8.7/random/rndegd.c @@ -0,0 +1,290 @@ +/* rndegd.c - interface to the EGD + * Copyright (C) 1999, 2000, 2002, 2003 Free Software Foundation, Inc. + * + * This file is part of Libgcrypt. + * + * Libgcrypt 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. + * + * Libgcrypt 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 program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "types.h" +#include "g10lib.h" +#include "cipher.h" +#include "rand-internal.h" + +#ifndef offsetof +#define offsetof(type, member) ((size_t) &((type *)0)->member) +#endif + +static int egd_socket = -1; + +/* Allocated name of the socket if supplied at runtime. */ +static char *user_socket_name; + + +/* Allocate a new filename from FIRST_PART and SECOND_PART and to + tilde expansion for first_part. SECOND_PART might be NULL. + */ +static char * +my_make_filename (const char *first_part, const char *second_part) +{ + size_t n; + char *name, *home, *p; + + n = strlen(first_part)+1; + if (second_part) + n += strlen (second_part) + 1; + + home = NULL; + if( *first_part == '~' && first_part[1] == '/' + && (home = getenv("HOME")) && *home ) + n += strlen(home); + + name = _gcry_xmalloc(n); + p = (home + ? stpcpy (stpcpy (name, home), first_part+1 ) + : stpcpy (name, first_part) ); + + if (second_part) + strcpy (stpcpy(p,"/"), second_part); + + return name; +} + + +static int +do_write( int fd, void *buf, size_t nbytes ) +{ + size_t nleft = nbytes; + int nwritten; + + while( nleft > 0 ) + { + nwritten = write( fd, buf, nleft); + if( nwritten < 0 ) + { + if( errno == EINTR ) + continue; + return -1; + } + nleft -= nwritten; + buf = (char*)buf + nwritten; + } + return 0; +} + +static int +do_read( int fd, void *buf, size_t nbytes ) +{ + int n, nread = 0; + + do + { + do + { + n = read(fd, (char*)buf + nread, nbytes ); + } + while( n == -1 && errno == EINTR ); + if( n == -1) + return nread? nread:-1; + if( n == 0) + return -1; + nread += n; + nbytes -= n; + } + while( nread < nbytes ); + return nread; +} + + +/* Note that his function is not thread-safe. */ +gpg_error_t +_gcry_rndegd_set_socket_name (const char *name) +{ + char *newname; + struct sockaddr_un addr; + + newname = my_make_filename (name, NULL); + if (strlen (newname)+1 >= sizeof addr.sun_path) + { + xfree (newname); + return gpg_error_from_syserror (); + } + xfree (user_socket_name); + user_socket_name = newname; + return 0; +} + + +/* Connect to the EGD and return the file descriptor. Return -1 on + error. With NOFAIL set to true, silently fail and return the + error, otherwise print an error message and die. */ +int +_gcry_rndegd_connect_socket (int nofail) +{ + int fd; + const char *bname = NULL; + char *name; + struct sockaddr_un addr; + int addr_len; + + if (egd_socket != -1) + { + close (egd_socket); + egd_socket = -1; + } + +#ifdef EGD_SOCKET_NAME + bname = EGD_SOCKET_NAME; +#endif + if (user_socket_name) + { + name = _gcry_strdup (user_socket_name); + if (!name) + { + if (!nofail) + log_fatal ("error allocating memory in rndegd: %s\n", + strerror(errno) ); + return -1; + } + } + else if ( !bname || !*bname ) + name = my_make_filename ("~/.gnupg", "entropy"); + else + name = my_make_filename (bname, NULL); + + if (strlen(name)+1 >= sizeof addr.sun_path) + log_fatal ("EGD socketname is too long\n"); + + memset( &addr, 0, sizeof addr ); + addr.sun_family = AF_UNIX; + strcpy( addr.sun_path, name ); + addr_len = (offsetof( struct sockaddr_un, sun_path ) + + strlen( addr.sun_path )); + + fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (fd == -1 && !nofail) + log_fatal("can't create unix domain socket: %s\n", strerror(errno) ); + else if (connect (fd, (struct sockaddr*)&addr, addr_len) == -1) + { + if (!nofail) + log_fatal("can't connect to EGD socket `%s': %s\n", + name, strerror(errno) ); + close (fd); + fd = -1; + } + xfree (name); + if (fd != -1) + egd_socket = fd; + return fd; +} + +/**************** + * Note: We always use the highest level. + * To boost the performance we may want to add some + * additional code for level 1 + * + * Using a level of 0 should never block and better add nothing + * to the pool. So this is just a dummy for EGD. + */ +int +_gcry_rndegd_gather_random (void (*add)(const void*, size_t, + enum random_origins), + enum random_origins origin, + size_t length, int level ) +{ + int fd = egd_socket; + int n; + byte buffer[256+2]; + int nbytes; + int do_restart = 0; + + if( !length ) + return 0; + if( !level ) + return 0; + + restart: + if (fd == -1 || do_restart) + fd = _gcry_rndegd_connect_socket (0); + + do_restart = 0; + + nbytes = length < 255? length : 255; + /* First time we do it with a non blocking request */ + buffer[0] = 1; /* non blocking */ + buffer[1] = nbytes; + if( do_write( fd, buffer, 2 ) == -1 ) + log_fatal("can't write to the EGD: %s\n", strerror(errno) ); + n = do_read( fd, buffer, 1 ); + if( n == -1 ) + { + log_error("read error on EGD: %s\n", strerror(errno)); + do_restart = 1; + goto restart; + } + n = buffer[0]; + if( n ) + { + n = do_read( fd, buffer, n ); + if( n == -1 ) + { + log_error("read error on EGD: %s\n", strerror(errno)); + do_restart = 1; + goto restart; + } + (*add)( buffer, n, origin ); + length -= n; + } + + if( length ) + { + log_info ( + _("Please wait, entropy is being gathered. Do some work if it would\n" + "keep you from getting bored, because it will improve the quality\n" + "of the entropy.\n") ); + } + while( length ) + { + nbytes = length < 255? length : 255; + + buffer[0] = 2; /* blocking */ + buffer[1] = nbytes; + if( do_write( fd, buffer, 2 ) == -1 ) + log_fatal("can't write to the EGD: %s\n", strerror(errno) ); + n = do_read( fd, buffer, nbytes ); + if( n == -1 ) + { + log_error("read error on EGD: %s\n", strerror(errno)); + do_restart = 1; + goto restart; + } + (*add)( buffer, n, origin ); + length -= n; + } + memset(buffer, 0, sizeof(buffer) ); + + return 0; /* success */ +} -- cgit 1.4.1