Update TODO

[cascardo/libreceita.git] / rnetclient.c

diff --git a/rnetclient.c b/rnetclient.c
index 0e13bb8..b5a8052 100644 (file)
--- a/rnetclient.c
+++ b/rnetclient.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright (C) 2012  Thadeu Lima de Souza Cascardo <cascardo@minaslivre.org>
+ *  Copyright (C) 2012-2013  Thadeu Lima de Souza Cascardo <cascardo@minaslivre.org>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -24,6 +24,7 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <netdb.h>
 #include <gnutls/gnutls.h>
 #include <zlib.h>
 
@@ -111,37 +112,80 @@ static int inflateRecord(char *buffer, size_t len, char **out, size_t *olen)
        return 0;
 }
 
-int main(int argc, char **argv)
+#define RNET_ADDRESS "receitanet.receita.fazenda.gov.br"
+
+static int connect_rnet(int *c)
 {
+       struct addrinfo *addresses;
+       struct addrinfo *addr;
+       struct addrinfo hint;
        struct sockaddr_in saddr;
+       int r;
+       int fd = *c = -1;
+       int i;
+       memset(&hint, 0, sizeof(hint));
+       hint.ai_family = AF_UNSPEC;
+       hint.ai_socktype = SOCK_STREAM;
+       hint.ai_protocol = IPPROTO_TCP;
+       hint.ai_flags = AI_ADDRCONFIG;
+       r = getaddrinfo(RNET_ADDRESS, "3456", &hint, &addresses);
+       if (r) {
+               return r;
+       }
+       for (addr = addresses; addr != NULL; addr = addr->ai_next) {
+               fd = socket(addr->ai_family, addr->ai_socktype,
+                               addr->ai_protocol);
+               if (fd >= 0)
+                       if (!(r = connect(fd, addr->ai_addr,
+                                               addr->ai_addrlen)))
+                               break;
+               close(fd);
+               fd = -1;
+       }
+       freeaddrinfo(addresses);
+       *c = fd;
+       if (fd == -1)
+               return EAI_SYSTEM;
+       return 0;
+}
+
+static int handshake(int c)
+{
+       char buffer[16];
+       int r;
+       buffer[0] = 1;
+       write(c, buffer, 1);
+       write(c, "00000000000000", 14);
+       r = read(c, buffer, 1);
+       if (r != 1 && buffer[0] != 'E')
+               return -1;
+       r = read(c, buffer, 14);
+       if (r != 14)
+               return -1;
+       return 0;
+}
+
+int main(int argc, char **argv)
+{
        int c;
        int r;
-       char buffer[1024];
+       char buffer[2048];
        char *out;
        size_t olen;
        gnutls_session_t session;
        gnutls_global_init();
        session_new(&session);
-       c = socket(PF_INET, SOCK_STREAM, 0);
-       saddr.sin_family = AF_INET;
-       saddr.sin_port = htons(3456);
-       saddr.sin_addr.s_addr = inet_addr("161.148.185.140");
-       r = connect(c, (struct sockaddr *) &saddr, sizeof(saddr));
-       if (r < 0) {
+       r = connect_rnet(&c);
+       if (r) {
                fprintf(stderr, "error connecting to server: %s\n",
-                       strerror(errno));
+                       r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
                exit(1);
        }
        gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) c);
-       buffer[0] = 1;
-       write(c, buffer, 1);
-       write(c, "00000000000000", 14);
-       r = read(c, buffer, 1);
-       if (r != 1 && buffer[0] != 'E')
-               exit(1);
-       r = read(c, buffer, 14);
-       if (r != 14)
+       r = handshake(c);
+       if (r < 0) {
                exit(1);
+       }
        if ((r = gnutls_handshake(session)) < 0)
                fprintf(stderr, "error in handshake: %s\n",
                                gnutls_strerror(r));