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Diffstat (limited to 'pcap-pf.c')
-rw-r--r--pcap-pf.c148
1 files changed, 111 insertions, 37 deletions
diff --git a/pcap-pf.c b/pcap-pf.c
index 96a4a50..fde97ba 100644
--- a/pcap-pf.c
+++ b/pcap-pf.c
@@ -23,7 +23,7 @@
*/
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
#include <sys/types.h>
@@ -107,7 +107,7 @@ pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
#ifdef LBL_ALIGN
struct enstamp stamp;
#endif
- register int pad;
+ register u_int pad;
again:
cc = pc->cc;
@@ -127,11 +127,11 @@ pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
(void)lseek(pc->fd, 0L, SEEK_SET);
goto again;
}
- snprintf(pc->errbuf, sizeof(pc->errbuf), "pf read: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(pc->errbuf,
+ sizeof(pc->errbuf), errno, "pf read");
return (-1);
}
- bp = pc->buffer + pc->offset;
+ bp = (u_char *)pc->buffer + pc->offset;
} else
bp = pc->bp;
/*
@@ -160,7 +160,7 @@ pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
}
}
if (cc < sizeof(*sp)) {
- snprintf(pc->errbuf, sizeof(pc->errbuf),
+ pcap_snprintf(pc->errbuf, sizeof(pc->errbuf),
"pf short read (%d)", cc);
return (-1);
}
@@ -172,7 +172,7 @@ pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
#endif
sp = (struct enstamp *)bp;
if (sp->ens_stamplen != sizeof(*sp)) {
- snprintf(pc->errbuf, sizeof(pc->errbuf),
+ pcap_snprintf(pc->errbuf, sizeof(pc->errbuf),
"pf short stamplen (%d)",
sp->ens_stamplen);
return (-1);
@@ -232,12 +232,12 @@ pcap_inject_pf(pcap_t *p, const void *buf, size_t size)
ret = write(p->fd, buf, size);
if (ret == -1) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "send");
return (-1);
}
return (ret);
-}
+}
static int
pcap_stats_pf(pcap_t *p, struct pcap_stat *ps)
@@ -302,6 +302,7 @@ pcap_activate_pf(pcap_t *p)
int backlog = -1; /* request the most */
struct enfilter Filter;
struct endevp devparams;
+ int err;
/*
* Initially try a read/write open (to allow the inject
@@ -321,16 +322,39 @@ pcap_activate_pf(pcap_t *p)
* its argument, even though it takes a "char *" rather than a
* "const char *" as its first argument. That appears to be
* the case, at least on Digital UNIX 4.0.
+ *
+ * XXX - is there an error that means "no such device"? Is
+ * there one that means "that device doesn't support pf"?
*/
- p->fd = pfopen(p->opt.source, O_RDWR);
+ p->fd = pfopen(p->opt.device, O_RDWR);
if (p->fd == -1 && errno == EACCES)
- p->fd = pfopen(p->opt.source, O_RDONLY);
+ p->fd = pfopen(p->opt.device, O_RDONLY);
if (p->fd < 0) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "pf open: %s: %s\n\
-your system may not be properly configured; see the packetfilter(4) man page\n",
- p->opt.source, pcap_strerror(errno));
+ if (errno == EACCES) {
+ pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "pf open: %s: Permission denied\n"
+"your system may not be properly configured; see the packetfilter(4) man page",
+ p->opt.device);
+ err = PCAP_ERROR_PERM_DENIED;
+ } else {
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "pf open: %s", p->opt.device);
+ err = PCAP_ERROR;
+ }
goto bad;
}
+
+ /*
+ * Turn a negative snapshot value (invalid), a snapshot value of
+ * 0 (unspecified), or a value bigger than the normal maximum
+ * value, into the maximum allowed value.
+ *
+ * If some application really *needs* a bigger snapshot
+ * length, we should just increase MAXIMUM_SNAPLEN.
+ */
+ if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
+ p->snapshot = MAXIMUM_SNAPLEN;
+
pf->OrigMissed = -1;
enmode = ENTSTAMP|ENNONEXCL;
if (!p->opt.immediate)
@@ -338,8 +362,9 @@ your system may not be properly configured; see the packetfilter(4) man page\n",
if (p->opt.promisc)
enmode |= ENPROMISC;
if (ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode) < 0) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "EIOCMBIS: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCMBIS");
+ err = PCAP_ERROR;
goto bad;
}
#ifdef ENCOPYALL
@@ -349,14 +374,16 @@ your system may not be properly configured; see the packetfilter(4) man page\n",
#endif
/* set the backlog */
if (ioctl(p->fd, EIOCSETW, (caddr_t)&backlog) < 0) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "EIOCSETW: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCSETW");
+ err = PCAP_ERROR;
goto bad;
}
/* discover interface type */
if (ioctl(p->fd, EIOCDEVP, (caddr_t)&devparams) < 0) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "EIOCDEVP: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCDEVP");
+ err = PCAP_ERROR;
goto bad;
}
/* HACK: to compile prior to Ultrix 4.2 */
@@ -437,8 +464,9 @@ your system may not be properly configured; see the packetfilter(4) man page\n",
* framing", there's not much we can do, as that
* doesn't specify a particular type of header.
*/
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"unknown data-link type %u", devparams.end_dev_type);
+ err = PCAP_ERROR;
goto bad;
}
/* set truncation */
@@ -450,8 +478,9 @@ your system may not be properly configured; see the packetfilter(4) man page\n",
} else
p->fddipad = 0;
if (ioctl(p->fd, EIOCTRUNCATE, (caddr_t)&p->snapshot) < 0) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "EIOCTRUNCATE: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCTRUNCATE");
+ err = PCAP_ERROR;
goto bad;
}
/* accept all packets */
@@ -459,8 +488,9 @@ your system may not be properly configured; see the packetfilter(4) man page\n",
Filter.enf_Priority = 37; /* anything > 2 */
Filter.enf_FilterLen = 0; /* means "always true" */
if (ioctl(p->fd, EIOCSETF, (caddr_t)&Filter) < 0) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "EIOCSETF: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCSETF");
+ err = PCAP_ERROR;
goto bad;
}
@@ -469,16 +499,19 @@ your system may not be properly configured; see the packetfilter(4) man page\n",
timeout.tv_sec = p->opt.timeout / 1000;
timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;
if (ioctl(p->fd, EIOCSRTIMEOUT, (caddr_t)&timeout) < 0) {
- snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "EIOCSRTIMEOUT: %s",
- pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "EIOCSRTIMEOUT");
+ err = PCAP_ERROR;
goto bad;
}
}
p->bufsize = BUFSPACE;
- p->buffer = (u_char*)malloc(p->bufsize + p->offset);
+ p->buffer = malloc(p->bufsize + p->offset);
if (p->buffer == NULL) {
- strlcpy(p->errbuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
+ pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+ errno, "malloc");
+ err = PCAP_ERROR;
goto bad;
}
@@ -499,15 +532,15 @@ your system may not be properly configured; see the packetfilter(4) man page\n",
return (0);
bad:
pcap_cleanup_live_common(p);
- return (PCAP_ERROR);
+ return (err);
}
pcap_t *
-pcap_create_interface(const char *device, char *ebuf)
+pcap_create_interface(const char *device _U_, char *ebuf)
{
pcap_t *p;
- p = pcap_create_common(device, ebuf, sizeof (struct pcap_pf));
+ p = pcap_create_common(ebuf, sizeof (struct pcap_pf));
if (p == NULL)
return (NULL);
@@ -515,12 +548,44 @@ pcap_create_interface(const char *device, char *ebuf)
return (p);
}
-int
-pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
+/*
+ * XXX - is there an error from pfopen() that means "no such device"?
+ * Is there one that means "that device doesn't support pf"?
+ */
+static int
+can_be_bound(const char *name _U_)
+{
+ return (1);
+}
+
+static int
+get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_)
{
+ /*
+ * Nothing we can do other than mark loopback devices as "the
+ * connected/disconnected status doesn't apply".
+ *
+ * XXX - is there a way to find out whether an adapter has
+ * something plugged into it?
+ */
+ if (*flags & PCAP_IF_LOOPBACK) {
+ /*
+ * Loopback devices aren't wireless, and "connected"/
+ * "disconnected" doesn't apply to them.
+ */
+ *flags |= PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE;
+ return (0);
+ }
return (0);
}
+int
+pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
+{
+ return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound,
+ get_if_flags));
+}
+
static int
pcap_setfilter_pf(pcap_t *p, struct bpf_program *fp)
{
@@ -547,8 +612,8 @@ pcap_setfilter_pf(pcap_t *p, struct bpf_program *fp)
* Yes. Try to install the filter.
*/
if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
- snprintf(p->errbuf, sizeof(p->errbuf),
- "BIOCSETF: %s", pcap_strerror(errno));
+ pcap_fmt_errmsg_for_errno(p->errbuf,
+ sizeof(p->errbuf), errno, "BIOCSETF");
return (-1);
}
@@ -607,3 +672,12 @@ pcap_setfilter_pf(pcap_t *p, struct bpf_program *fp)
pf->filtering_in_kernel = 0;
return (0);
}
+
+/*
+ * Libpcap version string.
+ */
+const char *
+pcap_lib_version(void)
+{
+ return (PCAP_VERSION_STRING);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 10:55:41 +0000