X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=rnetclient.c;h=3561b4500c7785b6a520bcf0b3297147477582a5;hb=26470029ecff8baa9b7a5a8162618c51e891fc8b;hp=2b98cc409adf915dfde4212d3128e46d2c9a6511;hpb=7421958f9ba1677463f8944edf0103f7841db604;p=cascardo%2Frnetclient.git diff --git a/rnetclient.c b/rnetclient.c index 2b98cc4..3561b45 100644 --- a/rnetclient.c +++ b/rnetclient.c @@ -1,5 +1,7 @@ /* - * Copyright (C) 2012-2013 Thadeu Lima de Souza Cascardo + * Copyright (C) 2012-2014 Thadeu Lima de Souza Cascardo + * Copyright (C) 2014 Alexandre Oliva + * Copyright (C) 2014 Sergio Durigan Junior * * 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 @@ -16,10 +18,14 @@ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ +#define _GNU_SOURCE #include #include #include #include +#include +#include +#include #include #include #include @@ -27,10 +33,99 @@ #include #include #include +#include +#include "config.h" #include "decfile.h" #include "rnet_message.h" #include "rnet_encode.h" +/* Program version and bug report address. */ + +const char *argp_program_version = PACKAGE_VERSION; +const char *argp_program_bug_address = PACKAGE_BUGREPORT; + +/* Documentation strings. */ + +static const char rnetclient_doc[] = + "Send the Brazilian Income Tax Report to the Brazilian " + "Tax Authority"; +static const char rnetclient_args_doc[] = + "[-d|--declaration] FILE [-o|--output-dir DIRECTORY]"; + +/* Description and definition of each option accepted by the program. */ + +static const struct argp_option rnetclient_options_desc[] = { + { "declaration", 'd', "FILE", 0, + "The Income Tax Report file that will be sent.", + 0 }, + + { "output-dir", 'o', "DIRECTORY", 0, + "The directory where you wish to save the receipt.", + 0 }, + + { NULL }, +}; + +struct rnetclient_args { + /* File representing the declaration. */ + char *input_file; + + /* Output directory to save the receipt. */ + char *output_dir; + + /* Output filename. */ + char output_file[PATH_MAX]; +}; + +/* Parser for command line arguments. */ + +static error_t rnetclient_parse_opt(int key, char *arg, struct argp_state *state) +{ + struct rnetclient_args *a = state->input; + switch (key) { + case 'd': + /* The user has explicitly provided a filename through + the '-d' switch. */ + a->input_file = arg; + break; + + case 'o': + a->output_dir = arg; + break; + + case ARGP_KEY_ARG: + /* The user has possibly provided a filename without + using any switches (e.g., by running './rnetclient + file'). */ + a->input_file = arg; + break; + + case ARGP_KEY_END: + /* We have reached the end of the argument parsing. + Let's check if the user has provided a filename. */ + if (a->input_file == NULL) + argp_error(state, + "You need to provide the Income Tax Declaration " + "filename."); + } + + return 0; +} + +/* Control struct used by argp. */ + +static struct argp rnetclient_argp = { + rnetclient_options_desc, + rnetclient_parse_opt, + rnetclient_args_doc, + rnetclient_doc, + NULL, NULL, NULL +}; + +static size_t chars2len (unsigned char buf[2]) { + return (buf[0] << 8 | buf[1]); +} + static void * get_creds(char *certfile) { static gnutls_certificate_credentials_t cred; @@ -63,9 +158,9 @@ static int deflateRecord(char *buffer, size_t len, char **out, size_t *olen, int deflateEnd(&zstrm); return -1; } - zstrm.next_in = buffer; + zstrm.next_in = (z_const Bytef *) buffer; zstrm.avail_in = len; - zstrm.next_out = *out + 6; + zstrm.next_out = (Bytef *) *out + 6; zstrm.avail_out = len * 2 + 30; while ((r = deflate(&zstrm, Z_FINISH)) != Z_STREAM_END && zstrm.avail_out > 0); @@ -94,15 +189,15 @@ static int inflateRecord(char *buffer, size_t len, char **out, size_t *olen) zstrm.opaque = Z_NULL; if ((r = inflateInit(&zstrm)) != Z_OK) return -1; - *olen = (buffer[3] << 8 | buffer[4]); + *olen = chars2len((unsigned char *) buffer+3); *out = malloc(*olen); if (!out) { inflateEnd(&zstrm); return -1; } - zstrm.next_in = buffer + 6; + zstrm.next_in = (z_const Bytef *) buffer + 6; zstrm.avail_in = len - 6; - zstrm.next_out = *out; + zstrm.next_out = (Bytef *) *out; zstrm.avail_out = *olen; while ((r = inflate(&zstrm, Z_FINISH)) != Z_STREAM_END && zstrm.avail_out > 0); @@ -122,10 +217,8 @@ 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; @@ -157,8 +250,12 @@ static int handshake(int c) char buffer[16]; int r; buffer[0] = 1; - write(c, buffer, 1); - write(c, "00000000000000", 14); + r = write(c, buffer, 1); + if (r < 1) + return -1; + r = write(c, "00000000000000", 14); + if (r < 14) + return -1; r = read(c, buffer, 1); if (r != 1 && buffer[0] != 'E') return -1; @@ -168,37 +265,69 @@ static int handshake(int c) return 0; } -static void usage(void) -{ - fprintf(stderr, "rnetclient [filename]\n"); - exit(1); -} - static int rnet_send(gnutls_session_t session, char *buffer, size_t len, int header) { - char *out; - size_t olen; - deflateRecord(buffer, len, &out, &olen, header); - gnutls_record_send(session, out, olen); - free(out); - return 0; + int r = 0; + /* Large files have to be uploaded as multiple + separately-deflated chunks, because the compressed and + uncompressed lengths in each record are encoded in unsigned + 16-bit integers each. + + The header can't be split into multiple chunks, and it + should never have to, since it won't ever get even close to + 64KiB. + + The uploaded file may be larger: to upload such large + files, it suffices to send multiple records till the entire + file is transferred, without waiting for a response. Since + we've alread informed the server of the file size in the + header, it knows exactly how much data to expect before + sending a response. It will only send an error message + before that if it times us out. + + Odds are that any reasonably large size will do, but it + can't be too close to 64KiB, otherwise there won't be room + for the compressed length should it not compress well, + which should never happen for capital-ASCII-only + declaration files, but who knows? + + This chunk size worked at the first try, uploading a + ~100KiB file, so let's stick with it. */ + const unsigned int maxc = 64472; + if (header && len > maxc) + return -1; + + do { + char *out = NULL; + size_t olen; + size_t clen = len < maxc ? len : maxc; + r = deflateRecord(buffer, clen, &out, &olen, header); + if (!r) { + size_t n = gnutls_record_send(session, out, olen); + if (n != olen) + r = -1; + } + free(out); + buffer += clen; + len -= clen; + } while (len && !r); + return r; } static int rnet_recv(gnutls_session_t session, struct rnet_message **message) { - char *out; - size_t olen; - int r; + char *out = NULL; + size_t olen = 0; char *buffer; size_t len; rnet_message_expand(message, 6); buffer = (*message)->buffer; - r = gnutls_record_recv(session, buffer, 6); + gnutls_record_recv(session, buffer, 6); if (buffer[0] == 0x01) { - len = (buffer[1] << 8 | buffer[2]); + len = chars2len((unsigned char *) buffer+1); rnet_message_expand(message, len); buffer = (*message)->buffer + 6; - r = gnutls_record_recv(session, buffer, len); + gnutls_record_recv(session, buffer, len); inflateRecord(buffer - 6, len + 6, &out, &olen); rnet_message_del(*message); *message = NULL; @@ -207,68 +336,89 @@ static int rnet_recv(gnutls_session_t session, struct rnet_message **message) (*message)->len = olen; free(out); } else { - len = (buffer[1] << 8 | buffer[2]); + len = chars2len((unsigned char *) buffer+1); rnet_message_expand(message, len - 1); buffer = (*message)->buffer + 6; - r = gnutls_record_recv(session, buffer, len - 1); + gnutls_record_recv(session, buffer, len - 1); (*message)->len = len + 4; rnet_message_strip(*message, 4); } return 0; } -static void save_rec_file(char *cpf, char *buffer, int len) +static int open_rec_file(char *cpf, struct rnetclient_args *args) { int fd; - char *filename; - char *home, *tmpdir; - mode_t mask; - size_t fnlen; - int r; - home = getenv("HOME"); - if (!home) { - tmpdir = getenv("TMPDIR"); - if (!tmpdir) - tmpdir = "/tmp"; - home = tmpdir; + char *path, *tmp; + + path = args->output_dir; + + /* Now it's time to decide which filename to write. We use + the declaration's filename as a base layout, because the + proprietary version of the IRPF program only recognizes + receipts if they have the same name as the declaration + files (disconsidering the extensions). For example, if the + declaration file is named "123.DEC", the receipt should be + named "123.REC". Therefore, if the declaration file has + the ".DEC" extension, we strip it out and add the ".REC". + Otherwise, we use the default template, which is to save + the receipt with the name "$CPF.REC". */ + tmp = strstr(args->input_file, ".DEC"); + if (tmp != NULL && tmp[sizeof(".DEC") - 1] == '\0') { + char *p; + /* We found the ".REC" extension. */ + p = strdup(basename(args->input_file)); + /* Replacing the ".DEC" by ".REC". Fortunately, we + just have to change one letter. */ + tmp = strstr(p, ".DEC"); + tmp[1] = 'R'; + snprintf(args->output_file, PATH_MAX, "%s/%s", path, p); + free(p); + } else { + /* The declaration filename does not follow the + convention, so we will not use it as a template. + We just generate a filename using "$CPF.REC". */ + snprintf(args->output_file, PATH_MAX, "%s/%s.REC", path, cpf); } - fnlen = strlen(home) + strlen(cpf) + 13; - filename = malloc(fnlen); - snprintf(filename, fnlen, "%s/%s.REC.XXXXXX", home, cpf); - mask = umask(0177); - fd = mkstemp(filename); + /* Now, open the file and write. */ + fd = open(args->output_file, O_CREAT | O_WRONLY | O_EXCL, S_IRUSR | S_IWUSR); if (fd < 0) { - fprintf(stderr, "Could not create receipt file: %s\n", - strerror(errno)); - goto out; + fprintf(stderr, "Could not create receipt file \"%s\": %s\n", + args->output_file, strerror(errno)); } - r = write(fd, buffer, len); + return fd; +} + +static int save_rec_file(int fd, char *buffer, int len, const struct rnetclient_args *args) +{ + ssize_t r; + + do { + r = write(fd, buffer, len); + } while (r < 0 && errno == EAGAIN); if (r != len) { - fprintf(stderr, "Could not write to receipt file%s%s\n", - r < 0 ? ": " : ".", - r < 0 ? strerror(errno) : ""); - goto out; + fprintf(stderr, "Could not write to receipt file: %s", + strerror(errno)); + } else { + fprintf(stderr, "Wrote the receipt file to %s.\n", + args->output_file); } - fprintf(stderr, "Wrote the receipt to %s.\n", filename); -out: - close(fd); - free(filename); - umask(mask); + return r; } -static void handle_response_text_and_file(char *cpf, struct rnet_message *message) +static void handle_response_text_and_file(int fd, struct rnet_message *message, const struct rnetclient_args *args) { char *value; int vlen; if (!rnet_message_parse(message, "texto", &value, &vlen)) fprintf(stderr, "%.*s\n", vlen, value); if (!rnet_message_parse(message, "arquivo", &value, &vlen)) - save_rec_file(cpf, value, vlen); + save_rec_file(fd, value, vlen, args); } -static void handle_response_already_found(char *cpf, struct rnet_message *message) +static void handle_response_already_found(int fd, struct rnet_message *message, const struct rnetclient_args *args) { - handle_response_text_and_file(cpf, message); + handle_response_text_and_file(fd, message, args); } static void handle_response_error(struct rnet_message *message) @@ -283,25 +433,63 @@ static void handle_response_error(struct rnet_message *message) int main(int argc, char **argv) { int c; - int r; + int r = 0; struct rnet_decfile *decfile; struct rnet_message *message = NULL; + struct rnetclient_args rnet_args; gnutls_session_t session; int finish = 0; char *cpf; - - if (argc < 2) { - usage(); + error_t err; + char cwd[PATH_MAX]; + int outfd; + + /* Parsing the command line arguments. The argp_parse + function calls exit() if there is some error during the + parsing process (e.g., the user has provided an unknown + flag or the parsing function has called argp_error). + However, if our internal parsing function returns something + different than zero, then argp_parse returns this value to + us. This is a bug, and should not happen in the current + state. */ + memset(&rnet_args, 0, sizeof (rnet_args)); + err = argp_parse (&rnetclient_argp, argc, argv, 0, NULL, &rnet_args); + if (err != 0) + fprintf(stderr, "internal error while parsing command line arguments."); + + /* If the user provided the output directory where she wishes + to save the receipt, then we use it. Otherwise, we save + the file in the current working directory (CWD). */ + if (rnet_args.output_dir == NULL) { + rnet_args.output_dir = getcwd(cwd, PATH_MAX); + } else { + struct stat st; + if (stat(rnet_args.output_dir, &st) < 0) { + fprintf(stderr, "Could not stat directory \"%s\": %s\n", + rnet_args.output_dir, strerror(errno)); + exit(1); + } + if (!S_ISDIR(st.st_mode)) { + fprintf(stderr, "Error: \"%s\" is a not a directory.\n", + rnet_args.output_dir); + exit(1); + } } - decfile = rnet_decfile_open(argv[1]); + decfile = rnet_decfile_open(rnet_args.input_file); if (!decfile) { - fprintf(stderr, "could not parse %s: %s\n", argv[1], strerror(errno)); + fprintf(stderr, "could not parse file \"%s\": %s\n", rnet_args.input_file, strerror(errno)); exit(1); } cpf = rnet_decfile_get_header_field(decfile, "cpf"); + outfd = open_rec_file(cpf, &rnet_args); + if (outfd < 0) { + r = 1; + goto out_rec; + } + gnutls_global_init(); session_new(&session); @@ -309,18 +497,29 @@ int main(int argc, char **argv) if (r) { fprintf(stderr, "error connecting to server: %s\n", r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r)); - exit(1); + r = 1; + goto out_connect; } - gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) c); + gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t)(intptr_t) c); r = handshake(c); if (r < 0) { - exit(1); + r = 1; + goto out_handshake; } - if ((r = gnutls_handshake(session)) < 0) + if ((r = gnutls_handshake(session)) < 0) { fprintf(stderr, "error in handshake: %s\n", gnutls_strerror(r)); + r = 1; + goto out_handshake; + } + + r = rnet_encode(decfile, &message); + if (r < 0) { + fprintf(stderr, "error encoding message, file not supported?\n"); + r = 1; + goto out; + } - rnet_encode(decfile, &message); rnet_send(session, message->buffer, message->len, 1); rnet_message_del(message); @@ -328,23 +527,24 @@ int main(int argc, char **argv) r = rnet_recv(session, &message); if (r || !message || message->len == 0) { fprintf(stderr, "error when receiving response\n"); + r = 1; goto out; } switch (message->buffer[0]) { case 1: /* go ahead */ - handle_response_text_and_file(cpf, message); + handle_response_text_and_file(outfd, message, &rnet_args); break; case 3: /* error */ handle_response_error(message); finish = 1; break; case 4: - handle_response_already_found(cpf, message); + handle_response_already_found(outfd, message, &rnet_args); finish = 1; break; case 2: case 5: - handle_response_text_and_file(cpf, message); + handle_response_text_and_file(outfd, message, &rnet_args); finish = 1; break; } @@ -360,6 +560,7 @@ int main(int argc, char **argv) r = rnet_recv(session, &message); if (r || !message || message->len == 0) { fprintf(stderr, "error when receiving response\n"); + r = 1; goto out; } switch (message->buffer[0]) { @@ -370,15 +571,19 @@ int main(int argc, char **argv) case 4: case 5: case 1: - handle_response_text_and_file(cpf, message); + handle_response_text_and_file(outfd, message, &rnet_args); break; } out: gnutls_bye(session, GNUTLS_SHUT_RDWR); +out_handshake: close(c); - rnet_decfile_close(decfile); +out_connect: gnutls_global_deinit(); + close(outfd); +out_rec: + rnet_decfile_close(decfile); - return 0; + return r; }