| /* |
| * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| #ifndef lint |
| static const char copyright[] _U_ = |
| "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\ |
| The Regents of the University of California. All rights reserved.\n"; |
| #endif |
| |
| /* |
| * Tests how select() and poll() behave on the selectable file descriptor |
| * for a pcap_t. |
| * |
| * This would be significantly different on Windows, as it'd test |
| * how WaitForMultipleObjects() would work on the event handle for a |
| * pcap_t. |
| */ |
| #include <pcap.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdarg.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| #ifdef HAVE_SYS_SELECT_H |
| #include <sys/select.h> |
| #else |
| #include <sys/time.h> /* older UN*Xes */ |
| #endif |
| #include <poll.h> |
| |
| char *program_name; |
| |
| /* |
| * This was introduced by Clang: |
| * |
| * http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute |
| * |
| * in some version (which version?); it has been picked up by GCC 5.0. |
| */ |
| #ifndef __has_attribute |
| /* |
| * It's a macro, so you can check whether it's defined to check |
| * whether it's supported. |
| * |
| * If it's not, define it to always return 0, so that we move on to |
| * the fallback checks. |
| */ |
| #define __has_attribute(x) 0 |
| #endif |
| |
| #if __has_attribute(noreturn) \ |
| || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \ |
| || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \ |
| || (defined(__xlC__) && __xlC__ >= 0x0A01) \ |
| || (defined(__HP_aCC) && __HP_aCC >= 61000) |
| /* |
| * Compiler with support for it, or GCC 2.5 and later, or Solaris Studio 12 |
| * (Sun C 5.9) and later, or IBM XL C 10.1 and later (do any earlier |
| * versions of XL C support this?), or HP aCC A.06.10 and later. |
| */ |
| #define PCAP_NORETURN __attribute((noreturn)) |
| #elif defined( _MSC_VER ) |
| #define PCAP_NORETURN __declspec(noreturn) |
| #else |
| #define PCAP_NORETURN |
| #endif |
| |
| #if __has_attribute(__format__) \ |
| || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \ |
| || (defined(__xlC__) && __xlC__ >= 0x0A01) \ |
| || (defined(__HP_aCC) && __HP_aCC >= 61000) |
| /* |
| * Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1 |
| * and later (do any earlier versions of XL C support this?), |
| * or HP aCC A.06.10 and later. |
| */ |
| #define PCAP_PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y))) |
| #else |
| #define PCAP_PRINTFLIKE(x,y) |
| #endif |
| |
| /* Forwards */ |
| static void countme(u_char *, const struct pcap_pkthdr *, const u_char *); |
| static void PCAP_NORETURN usage(void); |
| static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2); |
| static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2); |
| static char *copy_argv(char **); |
| |
| static pcap_t *pd; |
| |
| int |
| main(int argc, char **argv) |
| { |
| register int op; |
| bpf_u_int32 localnet, netmask; |
| register char *cp, *cmdbuf, *device; |
| int doselect, dopoll, dotimeout, dononblock; |
| struct bpf_program fcode; |
| char ebuf[PCAP_ERRBUF_SIZE]; |
| int selectable_fd; |
| int status; |
| int packet_count; |
| |
| device = NULL; |
| doselect = 0; |
| dopoll = 0; |
| dotimeout = 0; |
| dononblock = 0; |
| if ((cp = strrchr(argv[0], '/')) != NULL) |
| program_name = cp + 1; |
| else |
| program_name = argv[0]; |
| |
| opterr = 0; |
| while ((op = getopt(argc, argv, "i:sptn")) != -1) { |
| switch (op) { |
| |
| case 'i': |
| device = optarg; |
| break; |
| |
| case 's': |
| doselect = 1; |
| break; |
| |
| case 'p': |
| dopoll = 1; |
| break; |
| |
| case 't': |
| dotimeout = 1; |
| break; |
| |
| case 'n': |
| dononblock = 1; |
| break; |
| |
| default: |
| usage(); |
| /* NOTREACHED */ |
| } |
| } |
| |
| if (doselect && dopoll) { |
| fprintf(stderr, "selpolltest: choose select (-s) or poll (-p), but not both\n"); |
| return 1; |
| } |
| if (dotimeout && !doselect && !dopoll) { |
| fprintf(stderr, "selpolltest: timeout (-t) requires select (-s) or poll (-p)\n"); |
| return 1; |
| } |
| if (device == NULL) { |
| device = pcap_lookupdev(ebuf); |
| if (device == NULL) |
| error("%s", ebuf); |
| } |
| *ebuf = '\0'; |
| pd = pcap_open_live(device, 65535, 0, 1000, ebuf); |
| if (pd == NULL) |
| error("%s", ebuf); |
| else if (*ebuf) |
| warning("%s", ebuf); |
| if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) { |
| localnet = 0; |
| netmask = 0; |
| warning("%s", ebuf); |
| } |
| cmdbuf = copy_argv(&argv[optind]); |
| |
| if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0) |
| error("%s", pcap_geterr(pd)); |
| |
| if (pcap_setfilter(pd, &fcode) < 0) |
| error("%s", pcap_geterr(pd)); |
| if (pcap_get_selectable_fd(pd) == -1) |
| error("pcap_get_selectable_fd() fails"); |
| if (dononblock) { |
| if (pcap_setnonblock(pd, 1, ebuf) == -1) |
| error("pcap_setnonblock failed: %s", ebuf); |
| } |
| selectable_fd = pcap_get_selectable_fd(pd); |
| printf("Listening on %s\n", device); |
| if (doselect) { |
| for (;;) { |
| fd_set setread, setexcept; |
| struct timeval seltimeout; |
| |
| FD_ZERO(&setread); |
| FD_SET(selectable_fd, &setread); |
| FD_ZERO(&setexcept); |
| FD_SET(selectable_fd, &setexcept); |
| if (dotimeout) { |
| seltimeout.tv_sec = 0; |
| seltimeout.tv_usec = 1000; |
| status = select(selectable_fd + 1, &setread, |
| NULL, &setexcept, &seltimeout); |
| } else { |
| status = select(selectable_fd + 1, &setread, |
| NULL, &setexcept, NULL); |
| } |
| if (status == -1) { |
| printf("Select returns error (%s)\n", |
| strerror(errno)); |
| } else { |
| if (status == 0) |
| printf("Select timed out: "); |
| else |
| printf("Select returned a descriptor: "); |
| if (FD_ISSET(selectable_fd, &setread)) |
| printf("readable, "); |
| else |
| printf("not readable, "); |
| if (FD_ISSET(selectable_fd, &setexcept)) |
| printf("exceptional condition\n"); |
| else |
| printf("no exceptional condition\n"); |
| packet_count = 0; |
| status = pcap_dispatch(pd, -1, countme, |
| (u_char *)&packet_count); |
| if (status < 0) |
| break; |
| printf("%d packets seen, %d packets counted after select returns\n", |
| status, packet_count); |
| } |
| } |
| } else if (dopoll) { |
| for (;;) { |
| struct pollfd fd; |
| int polltimeout; |
| |
| fd.fd = selectable_fd; |
| fd.events = POLLIN; |
| if (dotimeout) |
| polltimeout = 1; |
| else |
| polltimeout = -1; |
| status = poll(&fd, 1, polltimeout); |
| if (status == -1) { |
| printf("Poll returns error (%s)\n", |
| strerror(errno)); |
| } else { |
| if (status == 0) |
| printf("Poll timed out\n"); |
| else { |
| printf("Poll returned a descriptor: "); |
| if (fd.revents & POLLIN) |
| printf("readable, "); |
| else |
| printf("not readable, "); |
| if (fd.revents & POLLERR) |
| printf("exceptional condition, "); |
| else |
| printf("no exceptional condition, "); |
| if (fd.revents & POLLHUP) |
| printf("disconnect, "); |
| else |
| printf("no disconnect, "); |
| if (fd.revents & POLLNVAL) |
| printf("invalid\n"); |
| else |
| printf("not invalid\n"); |
| } |
| packet_count = 0; |
| status = pcap_dispatch(pd, -1, countme, |
| (u_char *)&packet_count); |
| if (status < 0) |
| break; |
| printf("%d packets seen, %d packets counted after poll returns\n", |
| status, packet_count); |
| } |
| } |
| } else { |
| for (;;) { |
| packet_count = 0; |
| status = pcap_dispatch(pd, -1, countme, |
| (u_char *)&packet_count); |
| if (status < 0) |
| break; |
| printf("%d packets seen, %d packets counted after pcap_dispatch returns\n", |
| status, packet_count); |
| } |
| } |
| if (status == -2) { |
| /* |
| * We got interrupted, so perhaps we didn't |
| * manage to finish a line we were printing. |
| * Print an extra newline, just in case. |
| */ |
| putchar('\n'); |
| } |
| (void)fflush(stdout); |
| if (status == -1) { |
| /* |
| * Error. Report it. |
| */ |
| (void)fprintf(stderr, "%s: pcap_loop: %s\n", |
| program_name, pcap_geterr(pd)); |
| } |
| pcap_close(pd); |
| exit(status == -1 ? 1 : 0); |
| } |
| |
| static void |
| countme(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) |
| { |
| int *counterp = (int *)user; |
| |
| (*counterp)++; |
| } |
| |
| static void |
| usage(void) |
| { |
| (void)fprintf(stderr, "Usage: %s [ -sptn ] [ -i interface ] [expression]\n", |
| program_name); |
| exit(1); |
| } |
| |
| /* VARARGS */ |
| static void |
| error(const char *fmt, ...) |
| { |
| va_list ap; |
| |
| (void)fprintf(stderr, "%s: ", program_name); |
| va_start(ap, fmt); |
| (void)vfprintf(stderr, fmt, ap); |
| va_end(ap); |
| if (*fmt) { |
| fmt += strlen(fmt); |
| if (fmt[-1] != '\n') |
| (void)fputc('\n', stderr); |
| } |
| exit(1); |
| /* NOTREACHED */ |
| } |
| |
| /* VARARGS */ |
| static void |
| warning(const char *fmt, ...) |
| { |
| va_list ap; |
| |
| (void)fprintf(stderr, "%s: WARNING: ", program_name); |
| va_start(ap, fmt); |
| (void)vfprintf(stderr, fmt, ap); |
| va_end(ap); |
| if (*fmt) { |
| fmt += strlen(fmt); |
| if (fmt[-1] != '\n') |
| (void)fputc('\n', stderr); |
| } |
| } |
| |
| /* |
| * Copy arg vector into a new buffer, concatenating arguments with spaces. |
| */ |
| static char * |
| copy_argv(register char **argv) |
| { |
| register char **p; |
| register u_int len = 0; |
| char *buf; |
| char *src, *dst; |
| |
| p = argv; |
| if (*p == 0) |
| return 0; |
| |
| while (*p) |
| len += strlen(*p++) + 1; |
| |
| buf = (char *)malloc(len); |
| if (buf == NULL) |
| error("copy_argv: malloc"); |
| |
| p = argv; |
| dst = buf; |
| while ((src = *p++) != NULL) { |
| while ((*dst++ = *src++) != '\0') |
| ; |
| dst[-1] = ' '; |
| } |
| dst[-1] = '\0'; |
| |
| return buf; |
| } |