void
ccn_uri_append_percentescaped(struct ccn_charbuf *c,
const unsigned char *data, size_t size)
{
size_t i;
unsigned char ch;
for (i = 0; i < size && data[i] == '.'; i++)
continue;
/* For a component that consists solely of zero or more dots, add 3 more */
if (i == size)
ccn_charbuf_append(c, "...", 3);
for (i = 0; i < size; i++) {
ch = data[i];
/*
* Leave unescaped only the generic URI unreserved characters.
* See RFC 3986. Here we assume the compiler uses ASCII.
*/
if (('a' <= ch && ch <= 'z') ||
('A' <= ch && ch <= 'Z') ||
('0' <= ch && ch <= '9') ||
ch == '-' || ch == '.' || ch == '_' || ch == '~')
ccn_charbuf_append(c, &(data[i]), 1);
else
ccn_charbuf_putf(c, "%%%02X", (unsigned)ch);
}
}
/*
* utility, may need to be exported, to parse the buffer into a given slice
* structure.
*/
static int
slice_parse(struct ccns_slice *s, const unsigned char *p, size_t size) {
int res = 0;
struct ccn_buf_decoder decoder;
struct ccn_buf_decoder *d = ccn_buf_decoder_start(&decoder, p, size);
uintmax_t version;
int op;
int start;
struct ccn_charbuf *clause = NULL;
if (!ccn_buf_match_dtag(d, CCN_DTAG_SyncConfigSlice))
return (-1);
ccn_buf_advance(d);
if (!ccn_buf_match_dtag(d, CCN_DTAG_SyncVersion))
return (-1);
ccn_buf_advance(d);
ccn_parse_uintmax(d, &version);
ccn_buf_check_close(d);
if (version != SLICE_VERSION)
return (-1);
start = d->decoder.token_index;
if (ccn_parse_Name(d, NULL) < 0)
return(-1);
ccn_charbuf_reset(s->topo);
res = ccn_charbuf_append(s->topo, p + start, d->decoder.token_index - start);
if (res < 0)
return(-1);
start = d->decoder.token_index;
if (ccn_parse_Name(d, NULL) < 0)
return(-1);
ccn_charbuf_reset(s->prefix);
res = ccn_charbuf_append(s->prefix, p + start, d->decoder.token_index - start);
if (res < 0)
return(-1);
if (!ccn_buf_match_dtag(d, CCN_DTAG_SyncConfigSliceList))
return(-1);
ccn_buf_advance(d);
clause = ccn_charbuf_create();
if (clause == NULL)
return(-1);
while (ccn_buf_match_dtag(d, CCN_DTAG_SyncConfigSliceOp)) {
ccn_buf_advance(d);
op = ccn_parse_nonNegativeInteger(d); // op is a small integer
ccn_buf_check_close(d);
if (op != 0)
break;
ccn_charbuf_reset(clause);
start = d->decoder.token_index;
if (ccn_parse_Name(d, NULL) < 0)
break;
res = ccn_charbuf_append(clause, p + start, d->decoder.token_index - start);
ccns_slice_add_clause(s, clause);
}
ccn_charbuf_destroy(&clause);
ccn_buf_check_close(d); /* </SyncConfigSliceList> */
ccn_buf_check_close(d); /* </SyncConfigSlice> */
if (d->decoder.index != size || !CCN_FINAL_DSTATE(d->decoder.state))
return(-1);
return(0);
}
/*
* ccn_append_uri_component:
* This takes as input the escaped URI component at s and appends it
* to c. This does not do any ccnb-related stuff.
* Processing stops at an error or if an unescaped nul, '/', '?', or '#' is found.
* A component that consists solely of dots gets special treatment to reverse
* the addition of ... by ccn_uri_append_percentescaped. Since '.' is an unreserved
* character, percent-encoding is not supposed to change meaning and hence
* the dot processing happens after percent-encoding is removed.
* A positive return value indicates there were unescaped reserved or
* non-printable characters found. This might warrant some extra checking
* by the caller.
* A return value of -1 indicates the component was "..", so the caller
* will need to do something extra to handle this as appropriate.
* A return value of -2 indicates the component was empty or ".", so the caller
* should do nothing with it.
* A return value of -3 indicates a bad %-escaped sequence.
* If cont is not NULL, *cont is set to the number of input characters processed.
*/
int
ccn_append_uri_component(struct ccn_charbuf *c, const char *s, size_t limit, size_t *cont)
{
size_t start = c->length;
size_t i;
int err = 0;
int d1, d2;
unsigned char ch;
for (i = 0; i < limit; i++) {
ch = s[i];
switch (ch) {
case 0:
case '/':
case '?':
case '#':
limit = i;
break;
case '%':
if (i + 3 > limit || (d1 = hexit(s[i+1])) < 0 ||
(d2 = hexit(s[i+2])) < 0 ) {
return(-3);
}
ch = d1 * 16 + d2;
i += 2;
ccn_charbuf_append(c, &ch, 1);
break;
case ':': case '[': case ']': case '@':
case '!': case '$': case '&': case '\'': case '(': case ')':
case '*': case '+': case ',': case ';': case '=':
err++;
/* FALLTHROUGH */
default:
if (ch <= ' ' || ch > '~')
err++;
ccn_charbuf_append(c, &ch, 1);
break;
}
}
for (i = start; i < c->length && c->buf[i] == '.'; i++)
continue;
if (i == c->length) {
/* all dots */
i -= start;
if (i <= 1) {
c->length = start;
err = -2;
}
else if (i == 2) {
c->length = start;
err = -1;
}
else
c->length -= 3;
}
if (cont != NULL)
*cont = limit;
return(err);
}
/**
* Construct a new face instance based on the given address and port
* This face instance is only used to send new face request
*/
static struct
ccn_face_instance *construct_face(const unsigned char *ccndid, size_t ccndid_size,
const char *address, const char *port)
{
struct ccn_face_instance *fi = calloc(1, sizeof(*fi));
char rhostnamebuf[NI_MAXHOST];
char rhostportbuf[NI_MAXSERV];
struct addrinfo hints = {.ai_family = AF_UNSPEC, .ai_flags = (AI_ADDRCONFIG),
.ai_socktype = SOCK_DGRAM};
struct addrinfo *raddrinfo = NULL;
struct ccn_charbuf *store = ccn_charbuf_create();
int host_off = -1;
int port_off = -1;
int res;
res = getaddrinfo(address, port, &hints, &raddrinfo);
if (res != 0 || raddrinfo == NULL)
{
fprintf(stderr, "Error: getaddrinfo\n");
return NULL;
}
res = getnameinfo(raddrinfo->ai_addr, raddrinfo->ai_addrlen,
rhostnamebuf, sizeof(rhostnamebuf),
rhostportbuf, sizeof(rhostportbuf),
NI_NUMERICHOST | NI_NUMERICSERV);
freeaddrinfo(raddrinfo);
if (res != 0)
{
fprintf(stderr, "Error: getnameinfo\n");
return NULL;
}
fi->store = store;
fi->descr.ipproto = IPPROTO_UDP;
fi->descr.mcast_ttl = CCN_FIB_MCASTTTL;
fi->lifetime = CCN_FIB_LIFETIME;
ccn_charbuf_append(store, "newface", strlen("newface") + 1);
host_off = store->length;
ccn_charbuf_append(store, rhostnamebuf, strlen(rhostnamebuf) + 1);
port_off = store->length;
ccn_charbuf_append(store, rhostportbuf, strlen(rhostportbuf) + 1);
char *b = (char *)store->buf;
fi->action = b;
fi->descr.address = b + host_off;
fi->descr.port = b + port_off;
fi->descr.source_address = NULL;
fi->ccnd_id = ccndid;
fi->ccnd_id_size = ccndid_size;
return fi;
}
static int do_ping(struct ccn_schedule *sched, void *clienth,
struct ccn_scheduled_event *ev, int flags)
{
struct ccn_ping_client *client = clienth;
if (client->total >= 0 && client->sent >= client->total)
return 0;
struct ccn_charbuf *name = ccn_charbuf_create();
long int rnum;
char rnumstr[20];
int res;
ccn_charbuf_append(name, client->prefix->buf, client->prefix->length);
if (client->number < 0)
rnum = random();
else {
rnum = client->number;
client->number ++;
}
memset(&rnumstr, 0, 20);
sprintf(rnumstr, "%ld", rnum);
ccn_name_append_str(name, rnumstr);
res = ccn_express_interest(client->h, name, client->closure, NULL);
add_ccn_ping_entry(client, name, rnum);
client->sent ++;
sta.sent ++;
ccn_charbuf_destroy(&name);
if (res >= 0)
return client->interval * 1000000;
else
return 0;
}
/**
* Make a new fdholder corresponding to the fd
*/
PUBLIC struct fdholder *
r_io_record_fd(struct ccnr_handle *h, int fd,
void *who, socklen_t wholen,
int setflags)
{
int res;
struct fdholder *fdholder = NULL;
res = fcntl(fd, F_SETFL, O_NONBLOCK);
if (res == -1)
ccnr_msg(h, "fcntl: %s", strerror(errno));
fdholder = calloc(1, sizeof(*fdholder));
if (fdholder == NULL)
return(fdholder);
fdholder->name = ccn_charbuf_create();
if (fdholder->name == NULL)
abort();
if (who != NULL)
ccn_charbuf_append(fdholder->name, who, wholen);
fdholder->filedesc = fd;
init_face_flags(h, fdholder, setflags);
res = r_io_enroll_face(h, fdholder);
if (res == -1) {
ccn_charbuf_destroy(&fdholder->name);
free(fdholder);
fdholder = NULL;
}
return(fdholder);
}
static struct ccn_charbuf *
ccn_charbuf_duplicate(struct ccn_charbuf *c)
{
struct ccn_charbuf *ans = ccn_charbuf_create();
ccn_charbuf_append(ans, c->buf, c->length);
return(ans);
}
static struct ccn_charbuf *
resolve_templ(struct ccn_charbuf *templ, unsigned const char *vcomp, int size)
{
if (templ == NULL)
templ = ccn_charbuf_create();
if (size < 3 || size > 16) {
ccn_charbuf_destroy(&templ);
return(NULL);
}
templ->length = 0;
ccn_charbuf_append_tt(templ, CCN_DTAG_Interest, CCN_DTAG);
ccn_charbuf_append_tt(templ, CCN_DTAG_Name, CCN_DTAG);
ccn_charbuf_append_closer(templ); /* </Name> */
ccn_charbuf_append_tt(templ, CCN_DTAG_Exclude, CCN_DTAG);
append_filter_all(templ);
ccn_charbuf_append_tt(templ, CCN_DTAG_Component, CCN_DTAG);
ccn_charbuf_append_tt(templ, size, CCN_BLOB);
ccn_charbuf_append(templ, vcomp, size);
ccn_charbuf_append_closer(templ); /* </Component> */
append_future_vcomp(templ);
append_filter_all(templ);
ccn_charbuf_append_closer(templ); /* </Exclude> */
answer_highest(templ);
answer_passive(templ);
ccn_charbuf_append_closer(templ); /* </Interest> */
return(templ);
}
int
ccnb_append_forwarding_entry(struct ccn_charbuf *c,
const struct ccn_forwarding_entry *fe)
{
int res;
res = ccnb_element_begin(c, CCN_DTAG_ForwardingEntry);
if (fe->action != NULL)
res |= ccnb_tagged_putf(c, CCN_DTAG_Action, "%s",
fe->action);
if (fe->name_prefix != NULL && fe->name_prefix->length > 0)
res |= ccn_charbuf_append(c, fe->name_prefix->buf,
fe->name_prefix->length);
if (fe->ccnd_id_size != 0)
res |= ccnb_append_tagged_blob(c, CCN_DTAG_PublisherPublicKeyDigest,
fe->ccnd_id, fe->ccnd_id_size);
if (fe->faceid != ~0)
res |= ccnb_tagged_putf(c, CCN_DTAG_FaceID, "%u",
fe->faceid);
if (fe->flags >= 0)
res |= ccnb_tagged_putf(c, CCN_DTAG_ForwardingFlags, "%d",
fe->flags);
if (fe->lifetime >= 0)
res |= ccnb_tagged_putf(c, CCN_DTAG_FreshnessSeconds, "%d",
fe->lifetime);
res |= ccnb_element_end(c);
return(res);
}
/**
* Write some data to a seqwriter.
*
* This is roughly analogous to a write(2) call in non-blocking mode.
*
* The current implementation returns an error and refuses the new data if
* it does not fit in the current buffer.
* That is, there are no partial writes.
* In this case, the caller should ccn_run() for a little while and retry.
*
* It is also an error to attempt to write more than 4096 bytes.
*
* @returns the size written, or -1 for an error. In case of an error,
* the caller may test ccn_geterror() for values of EAGAIN or
* EINVAL from errno.h.
*/
int
ccn_seqw_write(struct ccn_seqwriter *w, const void *buf, size_t size)
{
struct ccn_charbuf *cob = NULL;
int res;
int ans;
if (w == NULL || w->cl.data != w)
return(-1);
if (w->buffer == NULL || size > MAX_DATA_SIZE)
return(ccn_seterror(w->h, EINVAL));
ans = size;
if (size + w->buffer->length > MAX_DATA_SIZE)
ans = ccn_seterror(w->h, EAGAIN);
else if (size != 0)
ccn_charbuf_append(w->buffer, buf, size);
if (w->interests_possibly_pending &&
(w->batching == 0 || ans == -1)) {
cob = seqw_next_cob(w);
if (cob != NULL) {
res = ccn_put(w->h, cob->buf, cob->length);
if (res >= 0) {
if (w->seqnum == 0) {
w->cob0 = cob;
cob = NULL;
}
w->buffer->length = 0;
w->seqnum++;
w->interests_possibly_pending = 0;
}
ccn_charbuf_destroy(&cob);
}
}
return(ans);
}
struct ccn_charbuf* CcnbOR_read(CcnbOR self) {
if (NBS_error(self->nbs)) {
self->error = true;
return NULL;
}
uint8_t* buf = (uint8_t*)malloc(2048);
size_t readSize = NBS_read(self->nbs, buf, 2048, NULL);
if (readSize == 0) {
free(buf);
return NULL;
}
ssize_t consumeSize = ccn_skeleton_decode(self->rd, buf, readSize);
if (self->rd->state < 0) self->error = true;
else ccn_charbuf_append(self->cbuf, buf, consumeSize);
if (consumeSize < readSize) NBS_pushback(self->nbs, buf, consumeSize, readSize - consumeSize, NULL);
else free(buf);
if (CCN_FINAL_DSTATE(self->rd->state)) {
struct ccn_charbuf* cbuf = self->cbuf;
self->cbuf = ccn_charbuf_create();
CcnbOR_clear(self);
return cbuf;
}
return NULL;
}
/**
* Parses a ccnb-encoded element expected to contain a UDATA string.
* @param d is the decoder
* @param dtag is the expected dtag value
* @param store - on success, the string value is appended to store,
* with null termination.
* @returns the offset into the store buffer of the copied value, or -1 for error.
* If a parse error occurs, d->decoder.state is set to a negative value.
* If the element is not present, -1 is returned but no parse error
* is indicated.
*/
int
ccn_parse_tagged_string(struct ccn_buf_decoder *d, enum ccn_dtag dtag, struct ccn_charbuf *store)
{
const unsigned char *p = NULL;
size_t size = 0;
int res;
if (ccn_buf_match_dtag(d, dtag)) {
ccn_buf_advance(d);
if (d->decoder.state >= 0 &&
CCN_GET_TT_FROM_DSTATE(d->decoder.state) == CCN_UDATA) {
res = store->length;
p = d->buf + d->decoder.index;
size = d->decoder.numval;
ccn_buf_advance(d);
}
ccn_buf_check_close(d);
if (d->decoder.state >= 0) {
// XXX - should check for valid utf-8 data.
res = store->length;
if (size > 0)
ccn_charbuf_append(store, p, size);
ccn_charbuf_append_value(store, 0, 1);
return(res);
}
}
return(-1);
}
int ccnb_append_dhcp_content(struct ccn_charbuf *c, int count, const struct ccn_dhcp_entry *head)
{
int res;
int i;
const struct ccn_dhcp_entry *de = head;
res = ccnb_element_begin(c, CCN_DTAG_Entry);
res |= ccnb_tagged_putf(c, CCN_DTAG_Count, "%d", count);
for (i = 0; i < count; i ++) {
if (de == NULL)
{
fprintf(stderr, "Error: number of ccn_dhcp_entry does not match\n");
break;
}
if (de->name_prefix != NULL && de->name_prefix->length > 0)
res |= ccn_charbuf_append(c, de->name_prefix->buf, de->name_prefix->length);
if (de->address != NULL)
res |= ccnb_tagged_putf(c, CCN_DTAG_Host, "%s", de->address);
if (de->port != NULL)
res |= ccnb_tagged_putf(c, CCN_DTAG_Port, "%s", de->port);
de = de->next;
}
res |= ccnb_element_end(c);
return res;
}
/**
* Append AnswerOriginKind=1 to partially constructed Interest, meaning
* do not generate new content.
*/
static void
answer_passive(struct ccn_charbuf *templ)
{
ccn_charbuf_append_tt(templ, CCN_DTAG_AnswerOriginKind, CCN_DTAG);
ccn_charbuf_append_tt(templ, 1, CCN_UDATA);
ccn_charbuf_append(templ, "1", 1);
ccn_charbuf_append_closer(templ); /* </AnswerOriginKind> */
}
int
ccn_charbuf_append_closer(struct ccn_charbuf *c)
{
int res;
const unsigned char closer = CCN_CLOSE;
res = ccn_charbuf_append(c, &closer, 1);
return(res);
}
// replace_name()
// Helper function to replace names in content objects
// Could build another version that works on already parsed content objects
// But as seen below it would be better to use a modified encoding call that
// didn't include the name at all.
//
int replace_name(struct ccn_charbuf* dest, unsigned char* src, size_t src_size, struct ccn_charbuf* name) {
struct ccn_parsed_ContentObject* pco = (struct ccn_parsed_ContentObject*) calloc(sizeof(struct ccn_parsed_ContentObject), 1);
int res = 0;
res = ccn_parse_ContentObject(src,src_size, pco, NULL);
if (res < 0) {
free(pco);
return (res);
}
ccn_charbuf_append_tt(dest, CCN_DTAG_ContentObject, CCN_DTAG);
ccn_charbuf_append(dest, &src[pco->offset[CCN_PCO_B_Signature]], pco->offset[CCN_PCO_E_Signature] - pco->offset[CCN_PCO_B_Signature]);
ccn_charbuf_append_charbuf(dest, name); // Already tagged
ccn_charbuf_append(dest, &src[pco->offset[CCN_PCO_B_SignedInfo]], pco->offset[CCN_PCO_E_SignedInfo] - pco->offset[CCN_PCO_B_SignedInfo]);
ccnb_append_tagged_blob(dest, CCN_DTAG_Content, NULL, 0);
ccn_charbuf_append_closer(dest);
free(pco);
return (0);
}
int ccn_dhcp_content_parse(const unsigned char *p, size_t size, struct ccn_dhcp_entry *tail)
{
struct ccn_buf_decoder decoder;
struct ccn_buf_decoder *d = ccn_buf_decoder_start(&decoder, p, size);
int i;
int count;
struct ccn_dhcp_entry *de = tail;
if (ccn_buf_match_dtag(d, CCN_DTAG_Entry)) {
ccn_buf_advance(d);
count = ccn_parse_optional_tagged_nonNegativeInteger(d, CCN_DTAG_Count);
for (i = 0; i < count; i ++) {
struct ccn_charbuf *store = ccn_charbuf_create();
size_t start;
size_t end;
int host_off = -1;
int port_off = -1;
de->next = calloc(1, sizeof(*de));
de = de->next;
memset(de, 0, sizeof(*de));
de->store = store;
de->next = NULL;
if (ccn_buf_match_dtag(d, CCN_DTAG_Name)) {
de->name_prefix = ccn_charbuf_create();
start = d->decoder.token_index;
ccn_parse_Name(d, NULL);
end = d->decoder.token_index;
ccn_charbuf_append(de->name_prefix, p + start, end - start);
}
else
de->name_prefix = NULL;
host_off = ccn_parse_tagged_string(d, CCN_DTAG_Host, store);
port_off = ccn_parse_tagged_string(d, CCN_DTAG_Port, store);
char *b = (char *)store->buf;
char *h = b + host_off;
char *p = b + port_off;
if (host_off >= 0)
memcpy((void *)de->address, h, strlen(h));
if (port_off >= 0)
memcpy((void *)de->port, p, strlen(p));
}
}
else
d->decoder.state = -__LINE__;
if (d->decoder.index != size || !CCN_FINAL_DSTATE(d->decoder.state))
ccn_dhcp_content_destroy(tail->next);
return count;
}
struct ccn_charbuf* SockAddr_hashkey(SockAddr self) {
if (self->hashkey == NULL) self->hashkey = ccn_charbuf_create();
else ccn_charbuf_reset(self->hashkey);
switch (self->addr->sa_family) {
case AF_INET6: {
struct sockaddr_in6* sin6 = (struct sockaddr_in6*)self->addr;
ccn_charbuf_append(self->hashkey, &(sin6->sin6_addr), sizeof(struct in6_addr));
ccn_charbuf_append(self->hashkey, &(sin6->sin6_port), sizeof(in_port_t));
} break;
case AF_PACKET: {
struct sockaddr_ll* sll = (struct sockaddr_ll*)self->addr;
ccn_charbuf_append(self->hashkey, &(sll->sll_addr), sll->sll_halen);
} break;
default:
ccn_charbuf_append(self->hashkey, self->addr, self->addrlen);
break;
}
return self->hashkey;
}
static void
append_future_vcomp(struct ccn_charbuf *templ)
{
/* One beyond a distant future version stamp */
unsigned char b[7] = {CCN_MARKER_VERSION + 1, 0, 0, 0, 0, 0, 0};
ccn_charbuf_append_tt(templ, CCN_DTAG_Component, CCN_DTAG);
ccn_charbuf_append_tt(templ, sizeof(b), CCN_BLOB);
ccn_charbuf_append(templ, b, sizeof(b));
ccn_charbuf_append_closer(templ); /* </Component> */
}
/*
* This appends a tagged, valid, fully-saturated Bloom filter, useful for
* excluding everything between two 'fenceposts' in an Exclude construct.
*/
static void
append_bf_all(struct ccn_charbuf *c)
{
unsigned char bf_all[9] = { 3, 1, 'A', 0, 0, 0, 0, 0, 0xFF };
const struct ccn_bloom_wire *b = ccn_bloom_validate_wire(bf_all, sizeof(bf_all));
if (b == NULL) abort();
ccn_charbuf_append_tt(c, CCN_DTAG_Bloom, CCN_DTAG);
ccn_charbuf_append_tt(c, sizeof(bf_all), CCN_BLOB);
ccn_charbuf_append(c, bf_all, sizeof(bf_all));
ccn_charbuf_append_closer(c);
}
int
ccn_uri_append(struct ccn_charbuf *c,
const unsigned char *ccnb,
size_t size,
int includescheme)
{
int ncomp = 0;
const unsigned char *comp = NULL;
size_t compsize = 0;
struct ccn_buf_decoder decoder;
struct ccn_buf_decoder *d = ccn_buf_decoder_start(&decoder, ccnb, size);
if (ccn_buf_match_dtag(d, CCN_DTAG_Interest) ||
ccn_buf_match_dtag(d, CCN_DTAG_ContentObject)) {
ccn_buf_advance(d);
if (ccn_buf_match_dtag(d, CCN_DTAG_Signature))
ccn_buf_advance_past_element(d);
}
if (!ccn_buf_match_dtag(d, CCN_DTAG_Name))
return(-1);
if (includescheme)
ccn_charbuf_append_string(c, "ccnx:");
ccn_buf_advance(d);
while (ccn_buf_match_dtag(d, CCN_DTAG_Component)) {
ccn_buf_advance(d);
compsize = 0;
if (ccn_buf_match_blob(d, &comp, &compsize))
ccn_buf_advance(d);
ccn_buf_check_close(d);
if (d->decoder.state < 0)
return(d->decoder.state);
ncomp += 1;
ccn_charbuf_append(c, "/", 1);
ccn_uri_append_percentescaped(c, comp, compsize);
}
ccn_buf_check_close(d);
if (d->decoder.state < 0)
return (d->decoder.state);
if (ncomp == 0)
ccn_charbuf_append(c, "/", 1);
return(ncomp);
}
/**
* Create a seqwriter for writing data to a versioned, segmented stream.
*
* @param name is a ccnb-encoded Name. It will be provided with a version
* based on the current time unless it already ends in a version
* component.
*/
struct ccn_seqwriter *
ccn_seqw_create(struct ccn *h, struct ccn_charbuf *name)
{
struct ccn_seqwriter *w = NULL;
struct ccn_charbuf *nb = NULL;
struct ccn_charbuf *nv = NULL;
int res;
w = calloc(1, sizeof(*w));
if (w == NULL)
return(NULL);
nb = ccn_charbuf_create();
ccn_charbuf_append(nb, name->buf, name->length);
nv = ccn_charbuf_create();
ccn_charbuf_append(nv, name->buf, name->length);
res = ccn_create_version(h, nv, CCN_V_NOW, 0, 0);
if (res < 0 || nb == NULL) {
ccn_charbuf_destroy(&nv);
ccn_charbuf_destroy(&nb);
free(w);
return(NULL);
}
w->cl.p = &seqw_incoming_interest;
w->cl.data = w;
w->nb = nb;
w->nv = nv;
w->buffer = ccn_charbuf_create();
w->h = h;
w->seqnum = 0;
w->interests_possibly_pending = 1;
res = ccn_set_interest_filter(h, nb, &(w->cl));
if (res < 0) {
ccn_charbuf_destroy(&w->nb);
ccn_charbuf_destroy(&w->nv);
ccn_charbuf_destroy(&w->buffer);
free(w);
return(NULL);
}
return(w);
}
/**
* Base loop for the background CCN task
*
* This is the main execution loop for the background task responsible for
* interacting with the CCN network. It is from this point that many of the above methods are
* called to work the inbound messages from ccnx as well as sending out the data messages.
*
* \param data the task context information setup by the parent sink element thread
*/
static void
ccn_event_thread (void *data)
{
Gstccnxsink *me = (Gstccnxsink *) data;
struct ccn_charbuf *filtName;
struct ccn_charbuf *temp;
int res = 0;
GST_DEBUG ("CCNxSink event: *** event thread starting");
temp = ccn_charbuf_create ();
filtName = ccn_charbuf_create ();
/* A closure is what defines what to do when an inbound interest arrives */
if ((me->ccn_closure = calloc (1, sizeof (struct ccn_closure))) == NULL) {
GST_ELEMENT_ERROR (me, RESOURCE, READ, (NULL), ("closure alloc failed"));
return;
}
/* We setup the closure to contain the sink element context reference, and also tell it what function to call */
me->ccn_closure->data = me;
me->ccn_closure->p = new_interests;
me->timeouts = 0;
ccn_charbuf_append (filtName, me->name->buf, me->name->length);
/* This call will set up a handler for interests we expect to get from clients */
// hDump(DUMP_ADDR(filtName->buf), DUMP_SIZE(filtName->length));
ccn_set_interest_filter (me->ccn, filtName, me->ccn_closure);
GST_DEBUG ("CCNxSink event: interest filter registered\n");
/* Some debugging information */
temp->length = 0;
ccn_uri_append (temp, me->name->buf, me->name->length, TRUE);
GST_DEBUG ("CCNxSink event: using uri: %s\n", ccn_charbuf_as_string (temp));
/* Now that the interest is registered, we loop around waiting for something to do */
/* We pass control to ccnx for a while so it can work with any incoming or outgoing data */
/* and then we check our fifo queue for work to do. That's about it! */
/* We check to see if any problems have caused our ccnd connection to fail, and we reconnect */
while (res >= 0) {
GST_DEBUG ("CCNxSink event: *** looping");
res = ccn_run (me->ccn, 50);
check_fifo (me);
if (res < 0 && ccn_get_connection_fd (me->ccn) == -1) {
GST_DEBUG ("CCNxSink event: need to reconnect...");
/* Try reconnecting, after a bit of delay */
msleep ((30 + (getpid () % 30)) * 1000);
res = ccn_connect (me->ccn, ccndHost ());
}
}
GST_DEBUG ("CCNxSink event: *** event thread ending");
}
static void init_all_chars_mixed_encoded(void) {
struct ccn_charbuf *c;
int i;
c = ccn_charbuf_create();
ccn_charbuf_append(c, "=", 1);
for (i = 0; i < 256; i+=2) {
ccn_charbuf_putf(c, "%02x%02X", i, i+1);
}
if (c->length >= sizeof(all_chars_mixed_encoded))
c->length = sizeof(all_chars_mixed_encoded) - 1;
memcpy(all_chars_mixed_encoded, c->buf, c->length);
ccn_charbuf_destroy(&c);
}
static int
ccn_encode_Signature(struct ccn_charbuf *buf,
const char *digest_algorithm,
const void *witness,
size_t witness_size,
const struct ccn_signature *signature,
size_t signature_size)
{
int res = 0;
if (signature == NULL)
return(-1);
res |= ccn_charbuf_append_tt(buf, CCN_DTAG_Signature, CCN_DTAG);
if (digest_algorithm != NULL) {
res |= ccn_charbuf_append_tt(buf, CCN_DTAG_DigestAlgorithm, CCN_DTAG);
res |= ccn_charbuf_append_tt(buf, strlen(digest_algorithm), CCN_UDATA);
res |= ccn_charbuf_append_string(buf, digest_algorithm);
res |= ccn_charbuf_append_closer(buf);
}
if (witness != NULL) {
res |= ccn_charbuf_append_tt(buf, CCN_DTAG_Witness, CCN_DTAG);
res |= ccn_charbuf_append_tt(buf, witness_size, CCN_BLOB);
res |= ccn_charbuf_append(buf, witness, witness_size);
res |= ccn_charbuf_append_closer(buf);
}
res |= ccn_charbuf_append_tt(buf, CCN_DTAG_SignatureBits, CCN_DTAG);
res |= ccn_charbuf_append_tt(buf, signature_size, CCN_BLOB);
res |= ccn_charbuf_append(buf, signature, signature_size);
res |= ccn_charbuf_append_closer(buf);
res |= ccn_charbuf_append_closer(buf);
return(res == 0 ? 0 : -1);
}
static PyObject *
Name_obj_from_ccn_parsed(PyObject *py_content_object)
{
struct ccn_charbuf *content_object;
struct ccn_parsed_ContentObject *parsed_content_object;
PyObject *py_ccn_name;
PyObject *py_Name;
struct ccn_charbuf *name;
size_t name_begin, name_end, s;
int r;
assert(CCNObject_IsValid(CONTENT_OBJECT, py_content_object));
content_object = CCNObject_Get(CONTENT_OBJECT, py_content_object);
parsed_content_object = _pyccn_content_object_get_pco(py_content_object);
if (!parsed_content_object)
return NULL;
name_begin = parsed_content_object->offset[CCN_PCO_B_Name];
name_end = parsed_content_object->offset[CCN_PCO_E_Name];
s = name_end - name_begin;
debug("ContentObject_from_ccn_parsed Name len=%zd\n", s);
if (parsed_content_object->name_ncomps <= 0) {
PyErr_SetString(g_PyExc_CCNNameError, "No name stored (or name is"
" invalid) in parsed content object");
return NULL;
}
py_ccn_name = CCNObject_New_charbuf(NAME, &name);
if (!py_ccn_name)
return NULL;
r = ccn_charbuf_append(name, &content_object->buf[name_begin], s);
if (r < 0) {
Py_DECREF(py_ccn_name);
return PyErr_NoMemory();
}
#if DEBUG_MSG
debug("Name: ");
dump_charbuf(name, stderr);
debug("\n");
#endif
py_Name = Name_obj_from_ccn(py_ccn_name);
Py_DECREF(py_ccn_name);
return py_Name;
}
int NdnMediaProcess::checkInterest()
{
int res = 0;
QHash<QString,UserDataBuf *>::iterator it;
ruMutex->lock();
for ( it = qhRemoteUser.begin(); it != qhRemoteUser.end(); ++it ) {
if (!it.value()->interested) {
/* Use a template to express our order preference for the first packet. */
struct ccn_charbuf *templ = ccn_charbuf_create();
struct ccn_charbuf *path = ccn_charbuf_create();
ccn_charbuf_append_tt(templ, CCN_DTAG_Interest, CCN_DTAG);
ccn_charbuf_append_tt(templ, CCN_DTAG_Name, CCN_DTAG);
ccn_charbuf_append_closer(templ);
ccn_charbuf_append_tt(templ, CCN_DTAG_ChildSelector, CCN_DTAG);
ccn_charbuf_append_tt(templ, 1, CCN_UDATA);
ccn_charbuf_append(templ, "1", 1); /* low bit 1: rightmost */
ccn_charbuf_append_closer(templ); /*<ChildSelector>*/
ccn_charbuf_append_closer(templ);
ccn_name_from_uri(path, it.key().toLocal8Bit().constData());
ccn_name_append_str(path, "audio");
if (res >= 0) {
if (it.value()->data_buf.callback->p == NULL) {fprintf(stderr, "data_buf.callback is NULL!\n"); exit(1); }
/*
int c = 0;
while (pthread_mutex_trylock(&ccn_mutex) != 0) {
c++;
if (c > 10000000) {
fprintf(stderr, "cannot obtain lock! %s:%d\n", __FILE__, __LINE__);
std::exit(1);
}
}
*/
pthread_mutex_lock(&ccn_mutex);
res = ccn_express_interest(ndnState.ccn, path, it.value()->data_buf.callback, templ);
pthread_mutex_unlock(&ccn_mutex);
it.value()->interested = 1;
fprintf(stderr, "short interest sent\n");
}
if (res < 0) {
fprintf(stderr, "sending the first interest failed\n");
exit(1);
}
ccn_charbuf_destroy(&path);
ccn_charbuf_destroy(&templ);
}
}
ruMutex->unlock();
return res;
}
Name
ParsedContentObject::keyName() const
{
if (m_pco.offset[CCN_PCO_E_KeyName_Name] > m_pco.offset[CCN_PCO_B_KeyName_Name])
{
CharbufPtr ptr = boost::make_shared<Charbuf>();
ccn_charbuf_append(ptr->getBuf(), head(m_bytes) + m_pco.offset[CCN_PCO_B_KeyName_Name], m_pco.offset[CCN_PCO_E_KeyName_Name] - m_pco.offset[CCN_PCO_B_KeyName_Name]);
return Name(*ptr);
}
else
{
return Name();
}
}
/**
* Append a tagged BLOB
*
* This is a ccnb-encoded element with containing the BLOB as content
* @param c is the buffer to append to.
* @param dtag is the element's dtab
* @param data points to the binary data
* @param size is the size of the data, in bytes
* @returns 0 for success or -1 for error.
*/
int
ccnb_append_tagged_blob(struct ccn_charbuf *c,
enum ccn_dtag dtag,
const void *data,
size_t size)
{
int res;
res = ccn_charbuf_append_tt(c, dtag, CCN_DTAG);
if (size != 0) {
res |= ccn_charbuf_append_tt(c, size, CCN_BLOB);
res |= ccn_charbuf_append(c, data, size);
}
res |= ccn_charbuf_append_closer(c);
return(res == 0 ? 0 : -1);
}
/**
* Append a ccnb start marker
*
* This forms the basic building block of ccnb-encoded data.
* @param c is the buffer to append to.
* @param val is the numval, intepreted according to tt (see enum ccn_tt).
* @param tt is the type field.
* @returns 0 for success or -1 for error.
*/
int
ccn_charbuf_append_tt(struct ccn_charbuf *c, size_t val, enum ccn_tt tt)
{
unsigned char buf[1+8*((sizeof(val)+6)/7)];
unsigned char *p = &(buf[sizeof(buf)-1]);
int n = 1;
p[0] = (CCN_TT_HBIT & ~CCN_CLOSE) |
((val & CCN_MAX_TINY) << CCN_TT_BITS) |
(CCN_TT_MASK & tt);
val >>= (7-CCN_TT_BITS);
while (val != 0) {
(--p)[0] = (((unsigned char)val) & ~CCN_TT_HBIT) | CCN_CLOSE;
n++;
val >>= 7;
}
return(ccn_charbuf_append(c, p, n));
}