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/*-
* Copyright (c) 2002 Dag-Erling Coïdan Smørgrav
* Copyright (c) 2008 William Pitcock
* Copyright (c) 2018 Thorsten Alteholz
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <dirent.h>
#include <ctype.h>
#include <errno.h>
#include <pwd.h>
#include <grp.h>
#include <assert.h>
#include <limits.h>
#include <err.h>
#define VERSION "0.4.0"
#define SEARCH_ALL 0x0000
#define SEARCH_GID 0x0001
#define SEARCH_PID 0x0002
#define SEARCH_PNAME 0x0004
#define SEARCH_UID 0x0008
#define SEARCH_LISTEN 0x0010
#define SEARCH_CONN 0x0020
#define SEARCH_PORTS 0x0040
#define SEARCH_IPV4_ONLY 0x0080
#define SEARCH_IPV6_ONLY 0x0100
#define SEARCH_PROTO 0x0200
#define SEARCH_UNIX 0x0400
#define PROTOCOL_UNIX 7
#define PROTOCOL_MAX_V6 6
#define PROTOCOL_TCP6 6
#define PROTOCOL_UDP6 5
#define PROTOCOL_RAW6 4
#define PROTOCOL_MAX_V4 3
#define PROTOCOL_TCP 3
#define PROTOCOL_UDP 2
#define PROTOCOL_RAW 1
#define PROTOCOL_NOTHING 0
#define INT_BIT (sizeof(int) * CHAR_BIT)
#define SET_PORT(p) do { ports[p / INT_BIT] |= 1 << (p % INT_BIT); } while (0)
#define CHK_PORT(p) (ports[p / INT_BIT] & (1 << (p % INT_BIT)))
typedef struct {
ino_t inode;
int fd;
int refcount, proto, flags, type;
char path[1024];
struct in_addr local_addr;
struct in_addr remote_addr;
struct in6_addr local6_addr;
struct in6_addr remote6_addr;
unsigned int local_port;
unsigned int remote_port;
unsigned char status, protocol;
uid_t uid;
} procnet_entry_t;
const char *states[] = {
"ESTABLISHED", "SYN_SENT", "SYN_RECV", "FWAIT1", "FWAIT2", "TIME_WAIT",
"CLOSED", "CLOSE_WAIT", "LAST_ACK", "LISTEN", "CLOSING", "UNKNOWN"
};
uid_t o_uid;
gid_t o_gid;
pid_t o_pid;
unsigned char o_protocol;
char buf[1024], o_pname[8];
DIR *proc, *fd;
FILE *tcp, *udp, *raw;
FILE *tcp6, *udp6, *raw6;
FILE *funix;
procnet_entry_t *netdata;
unsigned int o_search = SEARCH_ALL;
static int *ports;
void *xmalloc(size_t sz)
{
void *r;
r = malloc(sz);
if (!r)
abort();
return r;
}
void *xcalloc(size_t sz, size_t cnt)
{
void *r;
r = calloc(sz, cnt);
if (!r)
abort();
return r;
}
void *xrealloc(void *ptr, size_t sz)
{
void *r;
r = realloc(ptr, sz);
if (!r)
abort();
return r;
}
void usage(const char *progname)
{
fprintf(stderr, "usage: %s [-46clhu] [-p ports] [-U uid|user] [-G gid|group] [-P pid|process] [-R protocol]\n", progname);
fprintf(stderr, " protocol = 'tcp' or 'udp' or 'raw' or 'unix'\n");
exit(1);
}
int compare(const void *a, const void *b)
{
procnet_entry_t *a_rec, *b_rec;
a_rec = (procnet_entry_t *) a;
b_rec = (procnet_entry_t *) b;
if (a_rec->inode == b_rec->inode)
return 0;
else
return a_rec->inode > b_rec->inode ? 1 : -1;
}
int digittoint(const char i)
{
int r = i - '0';
assert(r >= 0 && r <= 9);
return r;
}
/* lame function to switch between buffers easily. */
int read_tcp_udp_raw(char *buf, int bufsize, char initialFileToRead)
{
static char fc = PROTOCOL_NOTHING;
FILE *fileptr;
if (fc==PROTOCOL_NOTHING) fc=initialFileToRead;
change:
switch (fc)
{
case PROTOCOL_TCP6:
fileptr = tcp6;
break;
case PROTOCOL_UDP6:
fileptr = udp6;
break;
case PROTOCOL_RAW6:
fileptr = raw6;
break;
case PROTOCOL_TCP:
fileptr = tcp;
break;
case PROTOCOL_UDP:
fileptr = udp;
break;
case PROTOCOL_RAW:
fileptr = raw;
break;
case PROTOCOL_UNIX:
fileptr = funix;
break;
case 0:
return 0;
default:
break;
}
if (fgets(buf, bufsize, fileptr) != NULL)
return fc;
--fc;
goto change;
}
const char *get_program_name(pid_t pid)
{
static char ret[1024];
FILE *fp;
snprintf(buf, sizeof(buf), "/proc/%u/status", pid);
if ((fp = fopen(buf, "r")) == NULL)
goto error;
if (fgets(buf, sizeof(buf), fp) == NULL)
goto error;
if (sscanf(buf, "Name: %s\n", ret) != 1)
goto error;
fclose(fp);
return ret;
error:
fclose(fp);
return "unknown";
}
const unsigned char string_to_protocol(char *proto)
{
if (strncmp(proto,"udp",3)==0) return PROTOCOL_UDP;
if (strncmp(proto,"tcp",3)==0) return PROTOCOL_TCP;
if (strncmp(proto,"raw",3)==0) return PROTOCOL_RAW;
if (strncmp(proto,"unix",4)==0) return PROTOCOL_UNIX;
return 0;
}
const char *protocol_to_string(unsigned int proto)
{
const char *type[] = { "raw", "udp4", "tcp4", "raw6", "udp6", "tcp6", "unix", NULL };
return type[proto - 1];
}
const char *conn6_addr(struct in6_addr addr)
{
char buf[1024];
inet_ntop( AF_INET6, &addr, buf, 1024);
return strdup(buf);
}
const char *conn_addr(struct in_addr addr)
{
if (inet_lnaof(addr) == INADDR_ANY)
return "*";
return inet_ntoa(addr);
}
char *conn6_to_string(struct in6_addr addr, unsigned int port)
{
char buf[1024];
int i = 0;
i += snprintf(buf, sizeof(buf), "%s:", conn6_addr(addr));
if (port != 0)
snprintf(buf + i, sizeof(buf) - i, "%u", port);
else
{
buf[i] = '*';
buf[i + 1] = '\0';
}
return strdup(buf);
}
char *conn_to_string(struct in_addr addr, unsigned int port)
{
char buf[1024];
int i = 0;
i += snprintf(buf, sizeof(buf), "%s:", conn_addr(addr));
if (port != 0)
snprintf(buf + i, sizeof(buf) - i, "%u", port);
else
{
buf[i] = '*';
buf[i + 1] = '\0';
}
return strdup(buf);
}
void display_record(procnet_entry_t *record, pid_t pid, const char *pname)
{
char *sbuf, *sbuf2;
struct passwd *pwd;
int printStatus=1;
if (record->protocol<=PROTOCOL_MAX_V4) {
/* we have a IPv4 record */
sbuf = conn_to_string(record->local_addr, record->local_port);
sbuf2 = conn_to_string(record->remote_addr, record->remote_port);
} else {
if ((record->protocol<=PROTOCOL_MAX_V6) && (record->protocol>PROTOCOL_MAX_V4)) {
/* we have a IPv6 record */
sbuf = conn6_to_string(record->local6_addr, record->local_port);
sbuf2 = conn6_to_string(record->remote6_addr, record->remote_port);
} else {
/* we have a unix record */
sbuf = strdup(record->path);
sbuf2= strdup(" ");
printStatus=0;
}
}
pwd = getpwuid(record->uid);
if (pwd == NULL) {
/* we have an unknow user, so don't print it */
printf("%-8s %-20s %-8u %-6s %-25s %-25s %s\n",
"N/A", pname, pid, protocol_to_string(record->protocol),
sbuf, sbuf2,
(printStatus==1)?states[record->status - 1]:" ");
} else {
pwd->pw_name[8] = '\0';
printf("%-8s %-20s %-8u %-6s %-25s %-25s %s\n",
pwd->pw_name, pname, pid, protocol_to_string(record->protocol),
sbuf, sbuf2,
(printStatus==1)?states[record->status - 1]:" ");
}
free(sbuf);
free(sbuf2);
}
unsigned int read_proc_net(char initialFileToRead)
{
int d;
unsigned int i = 0, size = 256, total;
char protocol;
netdata = xcalloc(sizeof(procnet_entry_t), size);
while ((protocol = read_tcp_udp_raw(buf, sizeof(buf), initialFileToRead)) != 0)
{
char *q, *x, *y;
int lport, rport;
uid_t uid;
ino_t inode;
unsigned short status;
/* for unix records */
int refcount;
int proto;
int flags;
int type;
char *path[1024];
int count;
if (i == size)
{
size *= 2;
netdata = xrealloc(netdata, (sizeof(procnet_entry_t) * size));
}
if (protocol <= PROTOCOL_MAX_V4) {
/* we have an V4 entry */
if (sscanf(buf, "%*d: %lX:%x %lX:%x %hx %*X:%*X %*X:%*X %*x %u %*u %lu",
(u_long *) &netdata[i].local_addr, &lport,
(u_long *) &netdata[i].remote_addr, &rport, &status,
&uid, &inode) != 7)
continue;
netdata[i].local_port = lport;
netdata[i].remote_port = rport;
netdata[i].uid = uid;
netdata[i].inode = inode;
netdata[i].status = status;
netdata[i++].protocol = protocol;
} else {
if ((protocol > PROTOCOL_MAX_V4) && (protocol <= PROTOCOL_MAX_V6)) {
/* we have an V6 entry */
if (sscanf(buf, "%*d: %2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx:%x %2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx:%x %hx %*X:%*X %*X:%*X %*x %u %*u %lu",
&netdata[i].local6_addr.s6_addr[ 3],
&netdata[i].local6_addr.s6_addr[ 2],
&netdata[i].local6_addr.s6_addr[ 1],
&netdata[i].local6_addr.s6_addr[ 0],
&netdata[i].local6_addr.s6_addr[ 7],
&netdata[i].local6_addr.s6_addr[ 6],
&netdata[i].local6_addr.s6_addr[ 5],
&netdata[i].local6_addr.s6_addr[ 4],
&netdata[i].local6_addr.s6_addr[11],
&netdata[i].local6_addr.s6_addr[10],
&netdata[i].local6_addr.s6_addr[ 9],
&netdata[i].local6_addr.s6_addr[ 8],
&netdata[i].local6_addr.s6_addr[15],
&netdata[i].local6_addr.s6_addr[14],
&netdata[i].local6_addr.s6_addr[13],
&netdata[i].local6_addr.s6_addr[12],
&lport,
&netdata[i].remote6_addr.s6_addr[ 3],
&netdata[i].remote6_addr.s6_addr[ 2],
&netdata[i].remote6_addr.s6_addr[ 1],
&netdata[i].remote6_addr.s6_addr[ 0],
&netdata[i].remote6_addr.s6_addr[ 7],
&netdata[i].remote6_addr.s6_addr[ 6],
&netdata[i].remote6_addr.s6_addr[ 5],
&netdata[i].remote6_addr.s6_addr[ 4],
&netdata[i].remote6_addr.s6_addr[11],
&netdata[i].remote6_addr.s6_addr[10],
&netdata[i].remote6_addr.s6_addr[ 9],
&netdata[i].remote6_addr.s6_addr[ 8],
&netdata[i].remote6_addr.s6_addr[15],
&netdata[i].remote6_addr.s6_addr[14],
&netdata[i].remote6_addr.s6_addr[13],
&netdata[i].remote6_addr.s6_addr[12],
&rport, &status,
&uid, &inode) != 37)
continue;
netdata[i].local_port = lport;
netdata[i].remote_port = rport;
netdata[i].uid = uid;
netdata[i].inode = inode;
netdata[i].status = status;
netdata[i++].protocol = protocol;
} else {
/* we have an unix entry */
count=sscanf(buf, "%*x: %u %u %u %u %hx %lu %s",
&refcount,
&proto,
&flags,
&type,
&status,
&inode,
(char*)&path);
if ((count!=6) && (count!=7)) continue;
snprintf(netdata[i].path,1024,"%s",(char*)path);
netdata[i].refcount=refcount;
netdata[i].proto=proto;
netdata[i].flags=flags;
netdata[i].type=type;
netdata[i].inode = inode;
netdata[i].status = status;
netdata[i++].protocol = protocol;
}
}
}
total = i;
qsort(netdata, total, sizeof(procnet_entry_t), compare);
return total;
}
static void parse_ports(const char *portspec)
{
const char *p, *q;
int port, end;
if (ports == NULL)
if ((ports = calloc(65536 / INT_BIT, sizeof(int))) == NULL)
err(1, "calloc()");
p = portspec;
while (*p != '\0') {
if (!isdigit(*p))
errx(1, "syntax error in port range");
for (q = p; *q != '\0' && isdigit(*q); ++q)
/* nothing */ ;
for (port = 0; p < q; ++p)
port = port * 10 + digittoint(*p);
if (port < 0 || port > 65535)
errx(1, "invalid port number");
SET_PORT(port);
switch (*p) {
case '-':
++p;
break;
case ',':
++p;
/* fall through */
case '\0':
default:
continue;
}
for (q = p; *q != '\0' && isdigit(*q); ++q)
/* nothing */ ;
for (end = 0; p < q; ++p)
end = end * 10 + digittoint(*p);
if (end < port || end > 65535)
errx(1, "invalid port number");
while (port++ < end)
SET_PORT(port);
if (*p == ',')
++p;
}
}
void handle_missing_file(char *filename)
{
fprintf(stderr, "can not open file %s, program will be aborted\n", filename);
abort();
}
int main(int argc, char *argv[])
{
struct passwd *pwd;
struct group *grp;
struct dirent *procent, *fdent;
int ch, i;
char initialFileToRead=PROTOCOL_MAX_V6;
unsigned int total;
while ((ch = getopt(argc, argv, "46clp:G:U:P:hR:u")) != EOF)
switch (ch)
{
case '4':
o_search |= SEARCH_IPV4_ONLY;
break;
case '6':
o_search |= SEARCH_IPV6_ONLY;
break;
case 'u':
initialFileToRead=PROTOCOL_UNIX;
break;
case 'p':
o_search |= SEARCH_PORTS;
parse_ports(optarg);
break;
case 'R':
o_search |= SEARCH_PROTO;
o_protocol=string_to_protocol(optarg);
break;
case 'c':
o_search |= SEARCH_CONN;
break;
case 'l':
o_search |= SEARCH_LISTEN;
break;
case 'G': /* Search a single group */
o_search |= SEARCH_GID;
if ((grp = getgrnam(optarg)) == NULL)
o_gid = atoi(optarg);
else
o_gid = grp->gr_gid;
o_uid = atoi(optarg);
break;
case 'P': /* Display a single pid */
o_search |= SEARCH_PID;
for (i = 0; i < strlen(optarg); ++i)
if (!isdigit(optarg[i]))
{
o_search = SEARCH_PNAME;
strncpy(o_pname, optarg, sizeof(o_pname));
}
if (o_search & SEARCH_PID)
o_pid = (int)strtol(optarg, (char **)NULL, 10);
break;
case 'U': /* Search a single user */
o_search |= SEARCH_UID;
if ((pwd = getpwnam(optarg)) == NULL)
o_uid = atoi(optarg);
else
o_uid = pwd->pw_uid;
break;
case 'h':
default:
usage(argv[0]);
}
if ((tcp = fopen("/proc/net/tcp", "r")) == NULL)
handle_missing_file("/proc/net/tcp");
if ((udp = fopen("/proc/net/udp", "r")) == NULL)
handle_missing_file("/proc/net/udp");
if ((raw = fopen("/proc/net/raw", "r")) == NULL)
handle_missing_file("/proc/net/raw");
if ((tcp6 = fopen("/proc/net/tcp6", "r")) == NULL)
handle_missing_file("/proc/net/tcp6");
if ((udp6 = fopen("/proc/net/udp6", "r")) == NULL)
handle_missing_file("/proc/net/udp6");
if ((raw6 = fopen("/proc/net/raw6", "r")) == NULL)
handle_missing_file("/proc/net/raw6");
if ((funix = fopen("/proc/net/unix", "r")) == NULL) {
/*
* independent of -u, we need do avoid PROTOCOL_UNIX if this file
* is not available
*/
initialFileToRead=PROTOCOL_MAX_V6;
}
if ((proc = opendir("/proc")) == NULL)
abort();
total = read_proc_net(initialFileToRead);
/*
* program has been abort()ed if file not available
* except funix
*/
fclose(tcp);
fclose(udp);
fclose(raw);
fclose(tcp6);
fclose(udp6);
fclose(raw6);
if (funix) fclose(funix);
printf("%-8s %-20s %-8s %-6s %-25s %-25s %s\n", "USER", "PROCESS", "PID", "PROTO", "SOURCE ADDRESS", "FOREIGN ADDRESS", "STATE");
while ((procent = readdir(proc)) != NULL)
{
if (!isdigit(*(procent->d_name)))
continue;
snprintf(buf, sizeof(buf), "/proc/%s/fd/", procent->d_name);
if ((fd = opendir(buf)) == NULL)
continue;
while ((fdent = readdir(fd)) != NULL)
{
struct passwd *pwd;
struct group *grp;
struct stat st;
procnet_entry_t *ptr;
const char *pn;
snprintf(buf, sizeof(buf), "/proc/%s/fd/%s", procent->d_name, fdent->d_name);
if (stat(buf, &st) < 0)
continue;
if (!S_ISSOCK(st.st_mode))
continue;
if ((ptr = bsearch(&st.st_ino, netdata, total, sizeof(procnet_entry_t), compare)) != NULL)
{
int display = 0;
pid_t pid = atoi(procent->d_name);
pn = get_program_name(pid);
if (o_search == 0)
{
display_record(ptr, pid, pn);
continue;
}
if (o_search & SEARCH_PROTO)
{
if (o_protocol == PROTOCOL_UDP) {
if ((ptr->protocol == PROTOCOL_UDP) ||
(ptr->protocol == PROTOCOL_UDP6))
display = 1;
}
if (o_protocol == PROTOCOL_TCP) {
if ((ptr->protocol == PROTOCOL_TCP) ||
(ptr->protocol == PROTOCOL_TCP6))
display = 1;
}
if (o_protocol == PROTOCOL_RAW) {
if ((ptr->protocol == PROTOCOL_RAW) ||
(ptr->protocol == PROTOCOL_RAW6))
display = 1;
}
if (o_protocol == PROTOCOL_UNIX) {
if (ptr->protocol == PROTOCOL_UNIX)
display = 1;
}
}
if (o_search & SEARCH_IPV4_ONLY)
{
if (ptr->protocol<=PROTOCOL_MAX_V4)
display = 1;
}
if (o_search & SEARCH_IPV6_ONLY)
{
if ((ptr->protocol<=PROTOCOL_MAX_V6)
&& (ptr->protocol>PROTOCOL_MAX_V4))
display = 1;
}
if (o_search & SEARCH_PID)
{
if (o_pid == atoi(procent->d_name))
display = 1;
}
if (o_search & SEARCH_PNAME)
{
if (!strncasecmp(pn, o_pname, strlen(o_pname)))
display = 1;
}
if (o_search & SEARCH_GID)
{
grp = getgrgid(o_gid);
while ((pwd = getpwnam(*((grp->gr_mem)++))) != NULL)
if (pwd->pw_uid == ptr->uid)
display = 1;
}
if (o_search & SEARCH_UID)
{
if (o_uid == ptr->uid)
display = 1;
}
if (o_search & SEARCH_LISTEN)
{
if (ptr->status == 10)
display = 1;
}
if (o_search & SEARCH_CONN)
{
if (ptr->status == 1)
display = 1;
}
if (o_search & SEARCH_PORTS)
{
if (CHK_PORT(ptr->local_port) || CHK_PORT(ptr->remote_port))
display = 1;
}
if (display)
display_record(ptr, pid, pn);
}
}
}
return 0;
}
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