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client-coap.c
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client-coap.c
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/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 * -*- */
/* coap-client -- simple CoAP client
*
* Copyright (C) 2010--2015 Olaf Bergmann <[email protected]>
*
* This file is part of the CoAP library libcoap. Please see README for terms of
* use.
*/
#include "coap_config.h"
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "coap.h"
#include "coap_list.h"
int flags = 0;
static unsigned char _token_data[8];
str the_token = { 0, _token_data };
#define FLAGS_BLOCK 0x01
static coap_list_t *optlist = NULL;
/* Request URI.
* TODO: associate the resources with transaction id and make it expireable */
static coap_uri_t uri;
static str proxy = { 0, NULL };
static unsigned short proxy_port = COAP_DEFAULT_PORT;
/* reading is done when this flag is set */
static int ready = 0;
static str output_file = { 0, NULL }; /* output file name */
static FILE *file = NULL; /* output file stream */
static str payload = { 0, NULL }; /* optional payload to send */
unsigned char msgtype = COAP_MESSAGE_CON; /* usually, requests are sent confirmable */
typedef unsigned char method_t;
method_t method = 1; /* the method we are using in our requests */
coap_block_t block = { .num = 0, .m = 0, .szx = 6 };
unsigned int wait_seconds = 90; /* default timeout in seconds */
coap_tick_t max_wait; /* global timeout (changed by set_timeout()) */
unsigned int obs_seconds = 30; /* default observe time */
coap_tick_t obs_wait = 0; /* timeout for current subscription */
#define min(a,b) ((a) < (b) ? (a) : (b))
#ifdef __GNUC__
#define UNUSED_PARAM __attribute__ ((unused))
#else /* not a GCC */
#define UNUSED_PARAM
#endif /* GCC */
static inline void
set_timeout(coap_tick_t *timer, const unsigned int seconds) {
coap_ticks(timer);
*timer += seconds * COAP_TICKS_PER_SECOND;
}
static int
append_to_output(const unsigned char *data, size_t len) {
size_t written;
if (!file) {
if (!output_file.s || (output_file.length && output_file.s[0] == '-'))
file = stdout;
else {
if (!(file = fopen((char *)output_file.s, "w"))) {
perror("fopen");
return -1;
}
}
}
do {
written = fwrite(data, 1, len, file);
len -= written;
data += written;
} while ( written && len );
fflush(file);
return 0;
}
static void
close_output(void) {
if (file) {
/* add a newline before closing in case were writing to stdout */
if (!output_file.s || (output_file.length && output_file.s[0] == '-'))
fwrite("\n", 1, 1, file);
fflush(file);
fclose(file);
}
}
static int
order_opts(void *a, void *b) {
coap_option *o1, *o2;
if (!a || !b)
return a < b ? -1 : 1;
o1 = (coap_option *)(((coap_list_t *)a)->data);
o2 = (coap_option *)(((coap_list_t *)b)->data);
return (COAP_OPTION_KEY(*o1) < COAP_OPTION_KEY(*o2))
? -1
: (COAP_OPTION_KEY(*o1) != COAP_OPTION_KEY(*o2));
}
static coap_pdu_t *
coap_new_request(coap_context_t *ctx,
method_t m,
coap_list_t **options,
unsigned char *data,
size_t length) {
coap_pdu_t *pdu;
coap_list_t *opt;
if ( ! ( pdu = coap_new_pdu() ) )
return NULL;
pdu->hdr->type = msgtype;
pdu->hdr->id = coap_new_message_id(ctx);
pdu->hdr->code = m;
pdu->hdr->token_length = the_token.length;
if ( !coap_add_token(pdu, the_token.length, the_token.s)) {
debug("cannot add token to request\n");
}
coap_show_pdu(pdu);
if (options) {
/* sort options for delta encoding */
LL_SORT((*options), order_opts);
LL_FOREACH((*options), opt) {
coap_option *o = (coap_option *)(opt->data);
coap_add_option(pdu,
COAP_OPTION_KEY(*o),
COAP_OPTION_LENGTH(*o),
COAP_OPTION_DATA(*o));
}
}
if (length) {
if ((flags & FLAGS_BLOCK) == 0)
coap_add_data(pdu, length, data);
else
coap_add_block(pdu, length, data, block.num, block.szx);
}
return pdu;
}
static coap_tid_t
clear_obs(coap_context_t *ctx,
const coap_endpoint_t *local_interface,
const coap_address_t *remote) {
coap_pdu_t *pdu;
coap_list_t *option;
coap_tid_t tid = COAP_INVALID_TID;
unsigned char buf[2];
/* create bare PDU w/o any option */
pdu = coap_pdu_init(msgtype,
COAP_REQUEST_GET,
coap_new_message_id(ctx),
COAP_MAX_PDU_SIZE);
if (!pdu) {
return tid;
}
if (!coap_add_token(pdu, the_token.length, the_token.s)) {
coap_log(LOG_CRIT, "cannot add token");
goto error;
}
for (option = optlist; option; option = option->next ) {
coap_option *o = (coap_option *)(option->data);
if (COAP_OPTION_KEY(*o) == COAP_OPTION_URI_HOST) {
if (!coap_add_option(pdu,
COAP_OPTION_KEY(*o),
COAP_OPTION_LENGTH(*o),
COAP_OPTION_DATA(*o))) {
goto error;
}
break;
}
}
if (!coap_add_option(pdu,
COAP_OPTION_OBSERVE,
coap_encode_var_bytes(buf, COAP_OBSERVE_CANCEL),
buf)) {
coap_log(LOG_CRIT, "cannot add option Observe: %u", COAP_OBSERVE_CANCEL);
goto error;
}
for (option = optlist; option; option = option->next ) {
coap_option *o = (coap_option *)(option->data);
switch (COAP_OPTION_KEY(*o)) {
case COAP_OPTION_URI_PORT :
case COAP_OPTION_URI_PATH :
case COAP_OPTION_URI_QUERY :
if (!coap_add_option (pdu,
COAP_OPTION_KEY(*o),
COAP_OPTION_LENGTH(*o),
COAP_OPTION_DATA(*o))) {
goto error;
}
break;
default:
;
}
}
coap_show_pdu(pdu);
if (pdu->hdr->type == COAP_MESSAGE_CON)
tid = coap_send_confirmed(ctx, local_interface, remote, pdu);
else
tid = coap_send(ctx, local_interface, remote, pdu);
if (tid == COAP_INVALID_TID) {
debug("clear_obs: error sending new request");
coap_delete_pdu(pdu);
} else if (pdu->hdr->type != COAP_MESSAGE_CON)
coap_delete_pdu(pdu);
return tid;
error:
coap_delete_pdu(pdu);
return tid;
}
static int
resolve_address(const str *server, struct sockaddr *dst) {
struct addrinfo *res, *ainfo;
struct addrinfo hints;
static char addrstr[256];
int error, len=-1;
memset(addrstr, 0, sizeof(addrstr));
if (server->length)
memcpy(addrstr, server->s, server->length);
else
memcpy(addrstr, "localhost", 9);
memset ((char *)&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_DGRAM;
hints.ai_family = AF_UNSPEC;
error = getaddrinfo(addrstr, NULL, &hints, &res);
if (error != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(error));
return error;
}
for (ainfo = res; ainfo != NULL; ainfo = ainfo->ai_next) {
switch (ainfo->ai_family) {
case AF_INET6:
case AF_INET:
len = ainfo->ai_addrlen;
memcpy(dst, ainfo->ai_addr, len);
goto finish;
default:
;
}
}
finish:
freeaddrinfo(res);
return len;
}
#define HANDLE_BLOCK1(Pdu) \
((method == COAP_REQUEST_PUT || method == COAP_REQUEST_POST) && \
((flags & FLAGS_BLOCK) == 0) && \
((Pdu)->hdr->code == COAP_RESPONSE_CODE(201) || \
(Pdu)->hdr->code == COAP_RESPONSE_CODE(204)))
static inline int
check_token(coap_pdu_t *received) {
return received->hdr->token_length == the_token.length &&
memcmp(received->hdr->token, the_token.s, the_token.length) == 0;
}
static void
message_handler(struct coap_context_t *ctx,
const coap_endpoint_t *local_interface,
const coap_address_t *remote,
coap_pdu_t *sent,
coap_pdu_t *received,
const coap_tid_t id UNUSED_PARAM) {
coap_pdu_t *pdu = NULL;
coap_opt_t *block_opt;
coap_opt_iterator_t opt_iter;
unsigned char buf[4];
coap_list_t *option;
size_t len;
unsigned char *databuf;
coap_tid_t tid;
#ifndef NDEBUG
if (LOG_DEBUG <= coap_get_log_level()) {
debug("** process incoming %d.%02d response:\n",
(received->hdr->code >> 5), received->hdr->code & 0x1F);
coap_show_pdu(received);
}
#endif
/* check if this is a response to our original request */
if (!check_token(received)) {
/* drop if this was just some message, or send RST in case of notification */
if (!sent && (received->hdr->type == COAP_MESSAGE_CON ||
received->hdr->type == COAP_MESSAGE_NON))
coap_send_rst(ctx, local_interface, remote, received);
return;
}
if (received->hdr->type == COAP_MESSAGE_RST) {
info("got RST\n");
return;
}
/* output the received data, if any */
if (COAP_RESPONSE_CLASS(received->hdr->code) == 2) {
/* set obs timer if we have successfully subscribed a resource */
if (sent && coap_check_option(received, COAP_OPTION_SUBSCRIPTION, &opt_iter)) {
debug("observation relationship established, set timeout to %d\n", obs_seconds);
set_timeout(&obs_wait, obs_seconds);
}
/* Got some data, check if block option is set. Behavior is undefined if
* both, Block1 and Block2 are present. */
block_opt = coap_check_option(received, COAP_OPTION_BLOCK2, &opt_iter);
if (block_opt) { /* handle Block2 */
unsigned short blktype = opt_iter.type;
/* TODO: check if we are looking at the correct block number */
if (coap_get_data(received, &len, &databuf))
append_to_output(databuf, len);
if(COAP_OPT_BLOCK_MORE(block_opt)) {
/* more bit is set */
debug("found the M bit, block size is %u, block nr. %u\n",
COAP_OPT_BLOCK_SZX(block_opt),
coap_opt_block_num(block_opt));
/* create pdu with request for next block */
pdu = coap_new_request(ctx, method, NULL, NULL, 0); /* first, create bare PDU w/o any option */
if ( pdu ) {
/* add URI components from optlist */
for (option = optlist; option; option = option->next ) {
coap_option *o = (coap_option *)(option->data);
switch (COAP_OPTION_KEY(*o)) {
case COAP_OPTION_URI_HOST :
case COAP_OPTION_URI_PORT :
case COAP_OPTION_URI_PATH :
case COAP_OPTION_URI_QUERY :
coap_add_option (pdu,
COAP_OPTION_KEY(*o),
COAP_OPTION_LENGTH(*o),
COAP_OPTION_DATA(*o));
break;
default:
; /* skip other options */
}
}
/* finally add updated block option from response, clear M bit */
/* blocknr = (blocknr & 0xfffffff7) + 0x10; */
debug("query block %d\n", (coap_opt_block_num(block_opt) + 1));
coap_add_option(pdu,
blktype,
coap_encode_var_bytes(buf,
((coap_opt_block_num(block_opt) + 1) << 4) |
COAP_OPT_BLOCK_SZX(block_opt)), buf);
if (pdu->hdr->type == COAP_MESSAGE_CON)
tid = coap_send_confirmed(ctx, local_interface, remote, pdu);
else
tid = coap_send(ctx, local_interface, remote, pdu);
if (tid == COAP_INVALID_TID) {
debug("message_handler: error sending new request");
coap_delete_pdu(pdu);
} else {
set_timeout(&max_wait, wait_seconds);
if (pdu->hdr->type != COAP_MESSAGE_CON)
coap_delete_pdu(pdu);
}
return;
}
}
} else { /* no Block2 option */
block_opt = coap_check_option(received, COAP_OPTION_BLOCK1, &opt_iter);
if (block_opt) { /* handle Block1 */
block.szx = COAP_OPT_BLOCK_SZX(block_opt);
block.num = coap_opt_block_num(block_opt);
debug("found Block1, block size is %u, block nr. %u\n",
block.szx, block.num);
if (payload.length <= (block.num+1) * (1 << (block.szx + 4))) {
debug("upload ready\n");
ready = 1;
return;
}
/* create pdu with request for next block */
pdu = coap_new_request(ctx, method, NULL, NULL, 0); /* first, create bare PDU w/o any option */
if (pdu) {
/* add URI components from optlist */
for (option = optlist; option; option = option->next ) {
coap_option *o = (coap_option *)(option->data);
switch (COAP_OPTION_KEY(*o)) {
case COAP_OPTION_URI_HOST :
case COAP_OPTION_URI_PORT :
case COAP_OPTION_URI_PATH :
case COAP_OPTION_CONTENT_FORMAT :
case COAP_OPTION_URI_QUERY :
coap_add_option (pdu,
COAP_OPTION_KEY(*o),
COAP_OPTION_LENGTH(*o),
COAP_OPTION_DATA(*o));
break;
default:
; /* skip other options */
}
}
/* finally add updated block option from response, clear M bit */
/* blocknr = (blocknr & 0xfffffff7) + 0x10; */
block.num++;
block.m = ((block.num+1) * (1 << (block.szx + 4)) < payload.length);
debug("send block %d\n", block.num);
coap_add_option(pdu,
COAP_OPTION_BLOCK1,
coap_encode_var_bytes(buf,
(block.num << 4) | (block.m << 3) | block.szx), buf);
coap_add_block(pdu,
payload.length,
payload.s,
block.num,
block.szx);
coap_show_pdu(pdu);
if (pdu->hdr->type == COAP_MESSAGE_CON)
tid = coap_send_confirmed(ctx, local_interface, remote, pdu);
else
tid = coap_send(ctx, local_interface, remote, pdu);
if (tid == COAP_INVALID_TID) {
debug("message_handler: error sending new request");
coap_delete_pdu(pdu);
} else {
set_timeout(&max_wait, wait_seconds);
if (pdu->hdr->type != COAP_MESSAGE_CON)
coap_delete_pdu(pdu);
}
return;
}
} else {
/* There is no block option set, just read the data and we are done. */
if (coap_get_data(received, &len, &databuf))
append_to_output(databuf, len);
}
}
} else { /* no 2.05 */
/* check if an error was signaled and output payload if so */
if (COAP_RESPONSE_CLASS(received->hdr->code) >= 4) {
fprintf(stderr, "%d.%02d",
(received->hdr->code >> 5), received->hdr->code & 0x1F);
if (coap_get_data(received, &len, &databuf)) {
fprintf(stderr, " ");
while(len--)
fprintf(stderr, "%c", *databuf++);
}
fprintf(stderr, "\n");
}
}
/* finally send new request, if needed */
if (pdu && coap_send(ctx, local_interface, remote, pdu) == COAP_INVALID_TID) {
debug("message_handler: error sending response");
}
coap_delete_pdu(pdu);
/* our job is done, we can exit at any time */
ready = coap_check_option(received, COAP_OPTION_SUBSCRIPTION, &opt_iter) == NULL;
}
static void
usage( const char *program, const char *version) {
const char *p;
p = strrchr( program, '/' );
if ( p )
program = ++p;
fprintf( stderr, "%s v%s -- a small CoAP implementation\n"
"(c) 2010-2015 Olaf Bergmann <[email protected]>\n\n"
"usage: %s [-A type...] [-t type] [-b [num,]size] [-B seconds] [-e text]\n"
"\t\t[-m method] [-N] [-o file] [-P addr[:port]] [-p port]\n"
"\t\t[-s duration] [-O num,text] [-T string] [-v num] [-a addr] URI\n\n"
"\tURI can be an absolute or relative coap URI,\n"
"\t-a addr\tthe local interface address to use\n"
"\t-A type...\taccepted media types as comma-separated list of\n"
"\t\t\tsymbolic or numeric values\n"
"\t-t type\t\tcontent format for given resource for PUT/POST\n"
"\t-b [num,]size\tblock size to be used in GET/PUT/POST requests\n"
"\t \t\t(value must be a multiple of 16 not larger than 1024)\n"
"\t \t\tIf num is present, the request chain will start at\n"
"\t \t\tblock num\n"
"\t-B seconds\tbreak operation after waiting given seconds\n"
"\t\t\t(default is %d)\n"
"\t-e text\t\tinclude text as payload (use percent-encoding for\n"
"\t\t\tnon-ASCII characters)\n"
"\t-f file\t\tfile to send with PUT/POST (use '-' for STDIN)\n"
"\t-m method\trequest method (get|put|post|delete), default is 'get'\n"
"\t-N\t\tsend NON-confirmable message\n"
"\t-o file\t\toutput received data to this file (use '-' for STDOUT)\n"
"\t-p port\t\tlisten on specified port\n"
"\t-s duration\tsubscribe for given duration [s]\n"
"\t-v num\t\tverbosity level (default: 3)\n"
"\t-O num,text\tadd option num with contents text to request\n"
"\t-P addr[:port]\tuse proxy (automatically adds Proxy-Uri option to\n"
"\t\t\trequest)\n"
"\t-T token\tinclude specified token\n"
"\n"
"examples:\n"
"\tcoap-client -m get coap://[::1]/\n"
"\tcoap-client -m get coap://[::1]/.well-known/core\n"
"\tcoap-client -m get -T cafe coap://[::1]/time\n"
"\techo 1000 | coap-client -m put -T cafe coap://[::1]/time -f -\n"
,program, version, program, wait_seconds);
}
static coap_list_t *
new_option_node(unsigned short key, unsigned int length, unsigned char *data) {
coap_list_t *node;
node = coap_malloc(sizeof(coap_list_t) + sizeof(coap_option) + length);
if (node) {
coap_option *option;
option = (coap_option *)(node->data);
COAP_OPTION_KEY(*option) = key;
COAP_OPTION_LENGTH(*option) = length;
memcpy(COAP_OPTION_DATA(*option), data, length);
} else {
coap_log(LOG_DEBUG, "new_option_node: malloc\n");
}
return node;
}
typedef struct {
unsigned char code;
char *media_type;
} content_type_t;
static void
cmdline_content_type(char *arg, unsigned short key) {
static content_type_t content_types[] = {
{ 0, "plain" },
{ 0, "text/plain" },
{ 40, "link" },
{ 40, "link-format" },
{ 40, "application/link-format" },
{ 41, "xml" },
{ 41, "application/xml" },
{ 42, "binary" },
{ 42, "octet-stream" },
{ 42, "application/octet-stream" },
{ 47, "exi" },
{ 47, "application/exi" },
{ 50, "json" },
{ 50, "application/json" },
{ 60, "cbor" },
{ 60, "application/cbor" },
{ 255, NULL }
};
coap_list_t *node;
unsigned char i, value[10];
int valcnt = 0;
unsigned char buf[2];
char *p, *q = arg;
while (q && *q) {
p = strchr(q, ',');
if (isdigit(*q)) {
if (p)
*p = '\0';
value[valcnt++] = atoi(q);
} else {
for (i=0;
content_types[i].media_type &&
strncmp(q, content_types[i].media_type, p ? (size_t)(p-q) : strlen(q)) != 0 ;
++i)
;
if (content_types[i].media_type) {
value[valcnt] = content_types[i].code;
valcnt++;
} else {
warn("W: unknown content-format '%s'\n",arg);
}
}
if (!p || key == COAP_OPTION_CONTENT_TYPE)
break;
q = p+1;
}
for (i = 0; i < valcnt; ++i) {
node = new_option_node(key, coap_encode_var_bytes(buf, value[i]), buf);
if (node) {
LL_PREPEND(optlist, node);
}
}
}
static void
cmdline_uri(char *arg) {
unsigned char portbuf[2];
#define BUFSIZE 40
unsigned char _buf[BUFSIZE];
unsigned char *buf = _buf;
size_t buflen;
int res;
if (proxy.length) { /* create Proxy-Uri from argument */
size_t len = strlen(arg);
while (len > 270) {
coap_insert(&optlist,
new_option_node(COAP_OPTION_PROXY_URI,
270,
(unsigned char *)arg));
len -= 270;
arg += 270;
}
coap_insert(&optlist,
new_option_node(COAP_OPTION_PROXY_URI,
len,
(unsigned char *)arg));
} else { /* split arg into Uri-* options */
coap_split_uri((unsigned char *)arg, strlen(arg), &uri );
if (uri.port != COAP_DEFAULT_PORT) {
coap_insert(&optlist,
new_option_node(COAP_OPTION_URI_PORT,
coap_encode_var_bytes(portbuf, uri.port),
portbuf));
}
if (uri.path.length) {
buflen = BUFSIZE;
res = coap_split_path(uri.path.s, uri.path.length, buf, &buflen);
while (res--) {
coap_insert(&optlist,
new_option_node(COAP_OPTION_URI_PATH,
COAP_OPT_LENGTH(buf),
COAP_OPT_VALUE(buf)));
buf += COAP_OPT_SIZE(buf);
}
}
if (uri.query.length) {
buflen = BUFSIZE;
buf = _buf;
res = coap_split_query(uri.query.s, uri.query.length, buf, &buflen);
while (res--) {
coap_insert(&optlist,
new_option_node(COAP_OPTION_URI_QUERY,
COAP_OPT_LENGTH(buf),
COAP_OPT_VALUE(buf)));
buf += COAP_OPT_SIZE(buf);
}
}
}
}
static int
cmdline_blocksize(char *arg) {
unsigned short size;
again:
size = 0;
while(*arg && *arg != ',')
size = size * 10 + (*arg++ - '0');
if (*arg == ',') {
arg++;
block.num = size;
goto again;
}
if (size)
block.szx = (coap_fls(size >> 4) - 1) & 0x07;
flags |= FLAGS_BLOCK;
return 1;
}
/* Called after processing the options from the commandline to set
* Block1 or Block2 depending on method. */
static void
set_blocksize(void) {
static unsigned char buf[4]; /* hack: temporarily take encoded bytes */
unsigned short opt;
unsigned int opt_length;
if (method != COAP_REQUEST_DELETE) {
opt = method == COAP_REQUEST_GET ? COAP_OPTION_BLOCK2 : COAP_OPTION_BLOCK1;
block.m = (opt == COAP_OPTION_BLOCK1) &&
((1u << (block.szx + 4)) < payload.length);
opt_length = coap_encode_var_bytes(buf,
(block.num << 4 | block.m << 3 | block.szx));
coap_insert(&optlist, new_option_node(opt, opt_length, buf));
}
}
static void
cmdline_subscribe(char *arg UNUSED_PARAM) {
obs_seconds = atoi(optarg);
coap_insert(&optlist, new_option_node(COAP_OPTION_SUBSCRIPTION, 0, NULL));
}
static int
cmdline_proxy(char *arg) {
char *proxy_port_str = strrchr((const char *)arg, ':'); /* explicit port ? */
if (proxy_port_str) {
char *ipv6_delimiter = strrchr((const char *)arg, ']');
if (!ipv6_delimiter) {
if (proxy_port_str == strchr((const char *)arg, ':')) {
/* host:port format - host not in ipv6 hexadecimal string format */
*proxy_port_str++ = '\0'; /* split */
proxy_port = atoi(proxy_port_str);
}
} else {
arg = strchr((const char *)arg, '[');
if (!arg) return 0;
arg++;
*ipv6_delimiter = '\0'; /* split */
if (ipv6_delimiter + 1 == proxy_port_str++) {
/* [ipv6 address]:port */
proxy_port = atoi(proxy_port_str);
}
}
}
proxy.length = strlen(arg);
if ( (proxy.s = coap_malloc(proxy.length + 1)) == NULL) {
proxy.length = 0;
return 0;
}
memcpy(proxy.s, arg, proxy.length+1);
return 1;
}
static inline void
cmdline_token(char *arg) {
strncpy((char *)the_token.s, arg, min(sizeof(_token_data), strlen(arg)));
the_token.length = strlen(arg);
}
static void
cmdline_option(char *arg) {
unsigned int num = 0;
while (*arg && *arg != ',') {
num = num * 10 + (*arg - '0');
++arg;
}
if (*arg == ',')
++arg;
coap_insert(&optlist,
new_option_node(num, strlen(arg), (unsigned char *)arg));
}
/**
* Calculates decimal value from hexadecimal ASCII character given in
* @p c. The caller must ensure that @p c actually represents a valid
* heaxdecimal character, e.g. with isxdigit(3).
*
* @hideinitializer
*/
#define hexchar_to_dec(c) ((c) & 0x40 ? ((c) & 0x0F) + 9 : ((c) & 0x0F))
/**
* Decodes percent-encoded characters while copying the string @p seg
* of size @p length to @p buf. The caller of this function must
* ensure that the percent-encodings are correct (i.e. the character
* '%' is always followed by two hex digits. and that @p buf provides
* sufficient space to hold the result. This function is supposed to
* be called by make_decoded_option() only.
*
* @param seg The segment to decode and copy.
* @param length Length of @p seg.
* @param buf The result buffer.
*/
static void
decode_segment(const unsigned char *seg, size_t length, unsigned char *buf) {
while (length--) {
if (*seg == '%') {
*buf = (hexchar_to_dec(seg[1]) << 4) + hexchar_to_dec(seg[2]);
seg += 2; length -= 2;
} else {
*buf = *seg;
}
++buf; ++seg;
}
}
/**
* Runs through the given path (or query) segment and checks if
* percent-encodings are correct. This function returns @c -1 on error
* or the length of @p s when decoded.
*/
static int
check_segment(const unsigned char *s, size_t length) {
size_t n = 0;
while (length) {
if (*s == '%') {
if (length < 2 || !(isxdigit(s[1]) && isxdigit(s[2])))
return -1;
s += 2;
length -= 2;
}
++s; ++n; --length;
}
return n;
}
static int
cmdline_input(char *text, str *buf) {
int len;
len = check_segment((unsigned char *)text, strlen(text));
if (len < 0)
return 0;
buf->s = (unsigned char *)coap_malloc(len);
if (!buf->s)
return 0;
buf->length = len;
decode_segment((unsigned char *)text, strlen(text), buf->s);
return 1;
}
static int
cmdline_input_from_file(char *filename, str *buf) {
FILE *inputfile = NULL;
ssize_t len;
int result = 1;
struct stat statbuf;
if (!filename || !buf)
return 0;
if (filename[0] == '-' && !filename[1]) { /* read from stdin */
buf->length = 20000;
buf->s = (unsigned char *)coap_malloc(buf->length);
if (!buf->s)
return 0;
inputfile = stdin;
} else {
/* read from specified input file */
if (stat(filename, &statbuf) < 0) {
perror("cmdline_input_from_file: stat");
return 0;
}
buf->length = statbuf.st_size;
buf->s = (unsigned char *)coap_malloc(buf->length);
if (!buf->s)
return 0;
inputfile = fopen(filename, "r");
if ( !inputfile ) {
perror("cmdline_input_from_file: fopen");
coap_free(buf->s);
return 0;
}
}
len = fread(buf->s, 1, buf->length, inputfile);
if (len < 0 || ((size_t)len < buf->length)) {
if (ferror(inputfile) != 0) {
perror("cmdline_input_from_file: fread");
coap_free(buf->s);
buf->length = 0;
buf->s = NULL;
result = 0;
} else {
buf->length = len;
}
}
if (inputfile != stdin)
fclose(inputfile);
return result;
}
static method_t
cmdline_method(char *arg) {
static char *methods[] =
{ 0, "get", "post", "put", "delete", 0};
unsigned char i;
for (i=1; methods[i] && strcasecmp(arg,methods[i]) != 0 ; ++i)
;
return i; /* note that we do not prevent illegal methods */
}
static coap_context_t *
get_context(const char *node, const char *port) {
coap_context_t *ctx = NULL;
int s;
struct addrinfo hints;
struct addrinfo *result, *rp;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_socktype = SOCK_DGRAM; /* Coap uses UDP */
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST | AI_NUMERICSERV | AI_ALL;
s = getaddrinfo(node, port, &hints, &result);
if ( s != 0 ) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
return NULL;
}
/* iterate through results until success */
for (rp = result; rp != NULL; rp = rp->ai_next) {