1 /* 2 * Off-the-Record Messaging library 3 * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, 4 * Willy Lew, Lisa Du, Nikita Borisov 5 * <otr@cypherpunks.ca> 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of version 2.1 of the GNU Lesser General 9 * Public License as published by the Free Software Foundation. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef __SERIAL_H__ 22 #define __SERIAL_H__ 23 24 #undef DEBUG 25 26 #ifdef DEBUG 27 28 #include <stdio.h> 29 30 #define debug_data(t,b,l) do { const unsigned char *data = (b); size_t i; \ 31 fprintf(stderr, "%s: ", (t)); \ 32 for(i=0;i<(l);++i) { \ 33 fprintf(stderr, "%02x", data[i]); \ 34 } \ 35 fprintf(stderr, "\n"); \ 36 } while(0) 37 38 #define debug_int(t,b) do { const unsigned char *data = (b); \ 39 unsigned int v = \ 40 (((unsigned int)data[0]) << 24) | (data[1] << 16) | (data[2] << 8) | data[3]; \ 41 fprintf(stderr, "%s: %u (0x%x)\n", (t), v, v); \ 42 } while(0) 43 44 #else 45 #define debug_data(t,b,l) 46 #define debug_int(t,b) 47 #endif 48 49 #define write_int(x) do { \ 50 bufp[0] = ((x) >> 24) & 0xff; \ 51 bufp[1] = ((x) >> 16) & 0xff; \ 52 bufp[2] = ((x) >> 8) & 0xff; \ 53 bufp[3] = (x) & 0xff; \ 54 bufp += 4; lenp -= 4; \ 55 } while(0) 56 57 #define write_mpi(x,nx,dx) do { \ 58 write_int(nx); \ 59 gcry_mpi_print(format, bufp, lenp, NULL, (x)); \ 60 debug_data((dx), bufp, (nx)); \ 61 bufp += (nx); lenp -= (nx); \ 62 } while(0) 63 64 #define require_len(l) do { \ 65 if (lenp < (l)) goto invval; \ 66 } while(0) 67 68 #define read_int(x) do { \ 69 require_len(4); \ 70 (x) = (((unsigned int)bufp[0]) << 24) | (bufp[1] << 16) | (bufp[2] << 8) | bufp[3]; \ 71 bufp += 4; lenp -= 4; \ 72 } while(0) 73 74 #define read_mpi(x) do { \ 75 size_t mpilen; \ 76 read_int(mpilen); \ 77 if (mpilen) { \ 78 require_len(mpilen); \ 79 gcry_mpi_scan(&(x), GCRYMPI_FMT_USG, bufp, mpilen, NULL); \ 80 } else { \ 81 (x) = gcry_mpi_set_ui(NULL, 0); \ 82 } \ 83 bufp += mpilen; lenp -= mpilen; \ 84 } while(0) 85 86 /* Write version and msg type into bufp*/ 87 #define write_header(version, msgtype) do { \ 88 bufp[0] = 0x00; \ 89 bufp[1] = version & 0xff; \ 90 bufp[2] = msgtype; \ 91 debug_data("Header", bufp, 3); \ 92 bufp += 3; lenp -= 3; \ 93 } while(0) 94 95 /* Verify msg header is v1, v2 or v3 and has type x, 96 * increment bufp past msg header */ 97 #define skip_header(x) do { \ 98 require_len(3); \ 99 if ((bufp[0] != 0x00) || (bufp[2] != x)) \ 100 goto invval; \ 101 if ((bufp[1] == 0x01) || (bufp[1] == 0x02) || \ 102 (bufp[1] == 0x03)) { \ 103 bufp += 3; lenp -= 3; \ 104 } else goto invval; \ 105 } while(0) 106 107 #endif 108