rnetclient.c

   1 /*
   2  *  Copyright (C) 2012-2013  Thadeu Lima de Souza Cascardo <cascardo@minaslivre.org>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 3 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <string.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <unistd.h>
  24 #include <sys/socket.h>
  25 #include <netinet/in.h>
  26 #include <arpa/inet.h>
  27 #include <netdb.h>
  28 #include <gnutls/gnutls.h>
  29 #include <zlib.h>
  30 #include "decfile.h"
  31 #include "rnet_message.h"
  32 #include "rnet_encode.h"
  33
  34 static void * get_creds(char *certfile)
  35 {
  36         static gnutls_certificate_credentials_t cred;
  37         gnutls_certificate_allocate_credentials(&cred);
  38         gnutls_certificate_set_x509_trust_file(cred, certfile,
  39                                         GNUTLS_X509_FMT_PEM);
  40         return cred;
  41 }
  42
  43 static void session_new(gnutls_session_t *session)
  44 {
  45         static void *cred;
  46         cred = get_creds("cert.pem");
  47         gnutls_init(session, GNUTLS_CLIENT);
  48         gnutls_set_default_priority(*session);
  49         gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE, cred);
  50 }
  51
  52 static int deflateRecord(char *buffer, size_t len, char **out, size_t *olen)
  53 {
  54         z_stream zstrm;
  55         int r;
  56         zstrm.zalloc = Z_NULL;
  57         zstrm.zfree = Z_NULL;
  58         zstrm.opaque = Z_NULL;
  59         if ((r = deflateInit(&zstrm, Z_DEFAULT_COMPRESSION)) != Z_OK)
  60                 return -1;
  61         *out = malloc(len * 2 + 36);
  62         if (!out) {
  63                 deflateEnd(&zstrm);
  64                 return -1;
  65         }
  66         zstrm.next_in = buffer;
  67         zstrm.avail_in = len;
  68         zstrm.next_out = *out + 6;
  69         zstrm.avail_out = len * 2 + 30;
  70         while ((r = deflate(&zstrm, Z_FINISH)) != Z_STREAM_END &&
  71                 zstrm.avail_out > 0);
  72         if ((r = deflate(&zstrm, Z_FINISH)) != Z_STREAM_END) {
  73                 deflateEnd(&zstrm);
  74                 free(*out);
  75                 return -1;
  76         }
  77         *olen = zstrm.avail_out + 6;
  78         (*out)[0] = 0x1;
  79         (*out)[1] = (zstrm.avail_out >> 8);
  80         (*out)[2] = (zstrm.avail_out & 0xff);
  81         (*out)[3] = (len >> 8);
  82         (*out)[4] = (len & 0xff);
  83         (*out)[5] = 0x1;
  84         deflateEnd(&zstrm);
  85         return 0;
  86 }
  87
  88 static int inflateRecord(char *buffer, size_t len, char **out, size_t *olen)
  89 {
  90         z_stream zstrm;
  91         int r;
  92         zstrm.zalloc = Z_NULL;
  93         zstrm.zfree = Z_NULL;
  94         zstrm.opaque = Z_NULL;
  95         if ((r = inflateInit(&zstrm)) != Z_OK)
  96                 return -1;
  97         *olen = (buffer[3] << 8 & buffer[4]);
  98         *out = malloc(*olen);
  99         if (!out) {
 100                 inflateEnd(&zstrm);
 101                 return -1;
 102         }
 103         zstrm.next_in = buffer + 6;
 104         zstrm.avail_in = len - 6;
 105         zstrm.next_out = *out;
 106         zstrm.avail_out = *olen;
 107         while ((r = inflate(&zstrm, Z_FINISH)) != Z_STREAM_END &&
 108                 zstrm.avail_out > 0);
 109         if ((r = inflate(&zstrm, Z_FINISH)) != Z_STREAM_END) {
 110                 inflateEnd(&zstrm);
 111                 free(*out);
 112                 return -1;
 113         }
 114         inflateEnd(&zstrm);
 115         return 0;
 116 }
 117
 118 #define RNET_ADDRESS "receitanet.receita.fazenda.gov.br"
 119
 120 static int connect_rnet(int *c)
 121 {
 122         struct addrinfo *addresses;
 123         struct addrinfo *addr;
 124         struct addrinfo hint;
 125         struct sockaddr_in saddr;
 126         int r;
 127         int fd = *c = -1;
 128         int i;
 129         memset(&hint, 0, sizeof(hint));
 130         hint.ai_family = AF_UNSPEC;
 131         hint.ai_socktype = SOCK_STREAM;
 132         hint.ai_protocol = IPPROTO_TCP;
 133         hint.ai_flags = AI_ADDRCONFIG;
 134         r = getaddrinfo(RNET_ADDRESS, "3456", &hint, &addresses);
 135         if (r) {
 136                 return r;
 137         }
 138         for (addr = addresses; addr != NULL; addr = addr->ai_next) {
 139                 fd = socket(addr->ai_family, addr->ai_socktype,
 140                                 addr->ai_protocol);
 141                 if (fd >= 0)
 142                         if (!(r = connect(fd, addr->ai_addr,
 143                                                 addr->ai_addrlen)))
 144                                 break;
 145                 close(fd);
 146                 fd = -1;
 147         }
 148         freeaddrinfo(addresses);
 149         *c = fd;
 150         if (fd == -1)
 151                 return EAI_SYSTEM;
 152         return 0;
 153 }
 154
 155 static int handshake(int c)
 156 {
 157         char buffer[16];
 158         int r;
 159         buffer[0] = 1;
 160         write(c, buffer, 1);
 161         write(c, "00000000000000", 14);
 162         r = read(c, buffer, 1);
 163         if (r != 1 && buffer[0] != 'E')
 164                 return -1;
 165         r = read(c, buffer, 14);
 166         if (r != 14)
 167                 return -1;
 168         return 0;
 169 }
 170
 171 static void usage(void)
 172 {
 173         fprintf(stderr, "rnetclient [filename]\n");
 174         exit(1);
 175 }
 176
 177 int main(int argc, char **argv)
 178 {
 179         int c;
 180         int r;
 181         char buffer[2048];
 182         char *out;
 183         size_t olen;
 184         struct rnet_decfile *decfile;
 185         struct rnet_message *message = NULL;
 186         gnutls_session_t session;
 187
 188         if (argc < 2) {
 189                 usage();
 190         }
 191
 192         decfile = rnet_decfile_open(argv[1]);
 193         if (!decfile) {
 194                 fprintf(stderr, "could not parse %s: %s\n", argv[1], strerror(errno));
 195                 exit(1);
 196         }
 197
 198         gnutls_global_init();
 199
 200         session_new(&session);
 201         r = connect_rnet(&c);
 202         if (r) {
 203                 fprintf(stderr, "error connecting to server: %s\n",
 204                         r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
 205                 exit(1);
 206         }
 207         gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) c);
 208         r = handshake(c);
 209         if (r < 0) {
 210                 exit(1);
 211         }
 212         if ((r = gnutls_handshake(session)) < 0)
 213                 fprintf(stderr, "error in handshake: %s\n",
 214                                 gnutls_strerror(r));
 215
 216         rnet_encode(decfile, &message);
 217         deflateRecord(message->buffer, message->len, &out, &olen);
 218         gnutls_record_send(session, out, olen);
 219         free(out);
 220
 221         while ((r = gnutls_record_recv(session, buffer, sizeof(buffer))) > 0)
 222                 write(1, buffer, r);
 223         close(c);
 224
 225         rnet_decfile_close(decfile);
 226
 227         gnutls_global_deinit();
 228
 229         return 0;
 230 }