/*
* Initialize so that sf_write() will output to the given stream.
*/
pcap_dumper_t *
pcap_dump_fopen(pcap_t *p, FILE *f)
{
int linktype;
linktype = dlt_to_linktype(p->linktype);
if (linktype == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"stream: link-layer type %d isn't supported in savefiles",
p->linktype);
return (NULL);
}
linktype |= p->linktype_ext;
return (pcap_setup_dump(p, linktype, f, "stream"));
}
/*
* Initialize so that sf_write() will output to the file named 'fname'.
*/
pcap_dumper_t *
pcap_dump_open(pcap_t *p, const char *fname)
{
FILE *f;
if (fname[0] == '-' && fname[1] == '\0')
f = stdout;
else {
f = fopen(fname, "w");
if (f == NULL) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
fname, pcap_strerror(errno));
return (NULL);
}
}
return (pcap_setup_dump(p, f, fname));
}
/*
* Initialize so that sf_write() will output to the file named 'fname'.
*/
pcap_dumper_t *
pcap_dump_open(pcap_t *p, const char *fname)
{
FILE *f;
int linktype;
/*
* If this pcap_t hasn't been activated, it doesn't have a
* link-layer type, so we can't use it.
*/
if (!p->activated) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: not-yet-activated pcap_t passed to pcap_dump_open",
fname);
return (NULL);
}
linktype = dlt_to_linktype(p->linktype);
if (linktype == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: link-layer type %d isn't supported in savefiles",
fname, p->linktype);
return (NULL);
}
linktype |= p->linktype_ext;
if (fname[0] == '-' && fname[1] == '\0') {
f = stdout;
fname = "standard output";
} else {
#if !defined(WIN32) && !defined(MSDOS)
f = fopen(fname, "w");
#else
f = fopen(fname, "wb");
#endif
if (f == NULL) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
fname, pcap_strerror(errno));
return (NULL);
}
}
return (pcap_setup_dump(p, linktype, f, fname));
}
pcap_dumper_t *
pcap_dump_open_append(pcap_t *p, const char *fname)
{
FILE *f;
int linktype;
int amt_read;
struct pcap_file_header ph;
linktype = dlt_to_linktype(p->linktype);
if (linktype == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: link-layer type %d isn't supported in savefiles",
fname, linktype);
return (NULL);
}
if (fname[0] == '-' && fname[1] == '\0')
return (pcap_setup_dump(p, linktype, stdout, "standard output"));
#if !defined(_WIN32) && !defined(MSDOS)
f = fopen(fname, "r+");
#else
f = fopen(fname, "rb+");
#endif
if (f == NULL) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
fname, pcap_strerror(errno));
return (NULL);
}
/*
* Try to read a pcap header.
*/
amt_read = fread(&ph, 1, sizeof (ph), f);
if (amt_read != sizeof (ph)) {
if (ferror(f)) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
fname, pcap_strerror(errno));
fclose(f);
return (NULL);
} else if (feof(f) && amt_read > 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: truncated pcap file header", fname);
fclose(f);
return (NULL);
}
}
#if defined(_WIN32) || defined(MSDOS)
/*
* We turn off buffering.
* XXX - why? And why not on the standard output?
*/
setbuf(f, NULL);
#endif
/*
* If a header is already present and:
*
* it's not for a pcap file of the appropriate resolution
* and the right byte order for this machine;
*
* the link-layer header types don't match;
*
* the snapshot lengths don't match;
*
* return an error.
*/
if (amt_read > 0) {
/*
* A header is already present.
* Do the checks.
*/
switch (ph.magic) {
case TCPDUMP_MAGIC:
if (p->opt.tstamp_precision != PCAP_TSTAMP_PRECISION_MICRO) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: different time stamp precision, cannot append to file", fname);
fclose(f);
return (NULL);
}
break;
case NSEC_TCPDUMP_MAGIC:
if (p->opt.tstamp_precision != PCAP_TSTAMP_PRECISION_NANO) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: different time stamp precision, cannot append to file", fname);
fclose(f);
return (NULL);
}
break;
case SWAPLONG(TCPDUMP_MAGIC):
case SWAPLONG(NSEC_TCPDUMP_MAGIC):
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: different byte order, cannot append to file", fname);
fclose(f);
return (NULL);
case KUZNETZOV_TCPDUMP_MAGIC:
case SWAPLONG(KUZNETZOV_TCPDUMP_MAGIC):
case NAVTEL_TCPDUMP_MAGIC:
case SWAPLONG(NAVTEL_TCPDUMP_MAGIC):
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: not a pcap file to which we can append", fname);
fclose(f);
return (NULL);
default:
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: not a pcap file", fname);
fclose(f);
return (NULL);
}
/*
* Good version?
*/
if (ph.version_major != PCAP_VERSION_MAJOR ||
ph.version_minor != PCAP_VERSION_MINOR) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: version is %u.%u, cannot append to file", fname,
ph.version_major, ph.version_minor);
fclose(f);
return (NULL);
}
if (linktype != ph.linktype) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: different linktype, cannot append to file", fname);
fclose(f);
return (NULL);
}
if (p->snapshot != ph.snaplen) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"%s: different snaplen, cannot append to file", fname);
fclose(f);
return (NULL);
}
} else {
/*
* A header isn't present; attempt to write it.
*/
if (sf_write_header(p, f, linktype, p->tzoff, p->snapshot) == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't write to %s: %s",
fname, pcap_strerror(errno));
(void)fclose(f);
return (NULL);
}
}
/*
* Start writing at the end of the file.
*/
if (fseek(f, 0, SEEK_END) == -1) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't seek to end of %s: %s",
fname, pcap_strerror(errno));
(void)fclose(f);
return (NULL);
}
return ((pcap_dumper_t *)f);
}
/*
* Initialize so that sf_write() will output to the given stream.
*/
pcap_dumper_t *
pcap_dump_fopen(pcap_t *p, FILE *f)
{
return (pcap_setup_dump(p, f, "stream"));
}