/* util.c * Utility routines * * $Id: util.c,v 1.39 2000/03/21 06:51:59 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_STAT_H #include #endif #ifdef NEED_SNPRINTF_H # ifdef HAVE_STDARG_H # include # else # include # endif # include "snprintf.h" #endif #ifndef WIN32 #include #endif #ifdef NEED_MKSTEMP #include "mkstemp.h" #endif #include "util.h" #ifdef HAVE_IO_H #include typedef int mode_t; /* for win32 */ #endif #ifdef HAVE_LIBPCAP #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_SYS_IOCTL_H #include #endif #ifdef HAVE_NET_IF_H #include #endif #ifdef HAVE_SYS_SOCKIO_H # include #endif #include "globals.h" #endif /* * Given a pathname, return a pointer to the last pathname separator * character in the pathname, or NULL if the pathname contains no * separators. */ static char * find_last_pathname_separator(char *path) { char *separator; #ifdef WIN32 char c; /* * We have to scan for '\' or '/'. * Get to the end of the string. */ separator = path + strlen(path); /* points to ending '\0' */ while (separator > path) { c = *--separator; if (c == '\\' || c == '/') return separator; /* found it */ } /* * OK, we didn't find any, so no directories - but there might * be a drive letter.... */ return strchr(path, ':'); #else separator = strrchr(path, '/'); #endif return separator; } /* * Given a pathname, return the last component. */ char * get_basename(char *path) { char *filename; filename = find_last_pathname_separator(path); if (filename == NULL) { /* * There're no directories, drive letters, etc. in the * name; the pathname *is* the file name. */ filename = path; } else { /* * Skip past the pathname or drive letter separator. */ filename++; } return filename; } /* * Given a pathname, return a string containing everything but the * last component. NOTE: this overwrites the pathname handed into * it.... */ char * get_dirname(char *path) { char *separator; separator = find_last_pathname_separator(path); if (separator == NULL) { /* * There're no directories, drive letters, etc. in the * name; there is no directory path to return. */ return NULL; } /* * Get rid of the last pathname separator and the final file * name following it. */ *separator = '\0'; /* * "path" now contains the pathname of the directory containing * the file/directory to which it referred. */ return path; } /* * Collect command-line arguments as a string consisting of the arguments, * separated by spaces. */ char * get_args_as_string(int argc, char **argv, int optind) { int len; int i; char *argstring; /* * Find out how long the string will be. */ len = 0; for (i = optind; i < argc; i++) { len += strlen(argv[i]); len++; /* space, or '\0' if this is the last argument */ } /* * Allocate the buffer for the string. */ argstring = g_malloc(len); /* * Now construct the string. */ strcpy(argstring, ""); i = optind; for (;;) { strcat(argstring, argv[i]); i++; if (i == argc) break; strcat(argstring, " "); } return argstring; } static char * setup_tmpdir(char *dir) { int len = strlen(dir); char *newdir; /* Append slash if necessary */ if (dir[len - 1] == '/') { newdir = dir; } else { newdir = g_malloc(len + 2); strcpy(newdir, dir); strcat(newdir, "/"); } return newdir; } static int try_tempfile(char *namebuf, int namebuflen, const char *dir, const char *pfx) { static const char suffix[] = "XXXXXXXXXX"; int namelen = strlen(dir) + strlen(pfx) + sizeof suffix; mode_t old_umask; int tmp_fd; if (namebuflen < namelen) { /* Stick in a truncated name, so that if this error is reported with the file name, you at least get something. */ snprintf(namebuf, namebuflen, "%s%s%s", dir, pfx, suffix); errno = ENAMETOOLONG; return -1; } strcpy(namebuf, dir); strcat(namebuf, pfx); strcat(namebuf, suffix); /* The Single UNIX Specification doesn't say that "mkstemp()" creates the temporary file with mode rw-------, so we won't assume that all UNIXes will do so; instead, we set the umask to 0077 to take away all group and other permissions, attempt to create the file, and then put the umask back. */ old_umask = umask(0077); tmp_fd = mkstemp(namebuf); umask(old_umask); return tmp_fd; } static char *tmpdir = NULL; #ifdef WIN32 static char *temp = NULL; #endif static char *E_tmpdir; #ifndef P_tmpdir #define P_tmpdir "/var/tmp" #endif int create_tempfile(char *namebuf, int namebuflen, const char *pfx) { char *dir; int fd; static gboolean initialized; if (!initialized) { if ((dir = getenv("TMPDIR")) != NULL) tmpdir = setup_tmpdir(dir); #ifdef WIN32 if ((dir = getenv("TEMP")) != NULL) temp = setup_tmpdir(dir); #endif E_tmpdir = setup_tmpdir(P_tmpdir); initialized = TRUE; } if (tmpdir != NULL) { fd = try_tempfile(namebuf, namebuflen, tmpdir, pfx); if (fd != -1) return fd; } #ifdef WIN32 if (temp != NULL) { fd = try_tempfile(namebuf, namebuflen, temp, pfx); if (fd != -1) return fd; } #endif fd = try_tempfile(namebuf, namebuflen, E_tmpdir, pfx); if (fd != -1) return fd; return try_tempfile(namebuf, namebuflen, "/tmp", pfx); } /* ASCII/EBCDIC conversion tables from * http://www.room42.com/store/computer_center/code_tables.shtml */ static guint8 ASCII_translate_EBCDIC [ 256 ] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F, 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D, 0x7D, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xC0, 0x6A, 0xD0, 0xA1, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B }; void ASCII_to_EBCDIC(guint8 *buf, guint bytes) { guint i; guint8 *bufptr; bufptr = buf; for (i = 0; i < bytes; i++, bufptr++) { *bufptr = ASCII_translate_EBCDIC[*bufptr]; } } guint8 ASCII_to_EBCDIC1(guint8 c) { return ASCII_translate_EBCDIC[c]; } static guint8 EBCDIC_translate_ASCII [ 256 ] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x2E, 0x2E, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x2E, 0x3F, 0x20, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x3C, 0x28, 0x2B, 0x7C, 0x26, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E, 0x2D, 0x2F, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x7C, 0x2C, 0x25, 0x5F, 0x3E, 0x3F, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22, 0x2E, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x2E, 0x2E, 0x2E, 0x5B, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x5D, 0x2E, 0x2E, 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x5C, 0x2E, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E }; void EBCDIC_to_ASCII(guint8 *buf, guint bytes) { guint i; guint8 *bufptr; bufptr = buf; for (i = 0; i < bytes; i++, bufptr++) { *bufptr = EBCDIC_translate_ASCII[*bufptr]; } } guint8 EBCDIC_to_ASCII1(guint8 c) { return EBCDIC_translate_ASCII[c]; } #ifdef HAVE_LIBPCAP /* * If the ability to capture packets is added to Wiretap, these * routines should be moved to the Wiretap source (with * "get_interface_list()" and "free_interface_list()" renamed to * "wtap_get_interface_list()" and "wtap_free_interface_list()", * and modified to use Wiretap routines to attempt to open the * interface. */ struct search_user_data { char *name; int found; }; static void search_for_if_cb(gpointer data, gpointer user_data); static void free_if_cb(gpointer data, gpointer user_data); #ifndef WIN32 GList * get_interface_list(int *err, char *err_str) { GList *il = NULL; gint nonloopback_pos = 0; struct ifreq *ifr, *last; struct ifconf ifc; struct ifreq ifrflags; int sock = socket(AF_INET, SOCK_DGRAM, 0); struct search_user_data user_data; pcap_t *pch; if (sock < 0) { sprintf(err_str, "Error opening socket: %s", strerror(errno)); return NULL; } /* * Since we have to grab the interface list all at once, we'll * make plenty of room. */ ifc.ifc_len = 1024 * sizeof(struct ifreq); ifc.ifc_buf = malloc(ifc.ifc_len); if (ioctl(sock, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len < sizeof(struct ifreq)) { sprintf(err_str, "SIOCGIFCONF error getting list of interfaces: %s", strerror(errno)); goto fail; } ifr = (struct ifreq *) ifc.ifc_req; last = (struct ifreq *) ((char *) ifr + ifc.ifc_len); while (ifr < last) { /* * Skip addresses that begin with "dummy", or that include * a ":" (the latter are Solaris virtuals). */ if (strncmp(ifr->ifr_name, "dummy", 5) == 0 || strchr(ifr->ifr_name, ':') != NULL) goto next; /* * If we already have this interface name on the list, * don't add it (SIOCGIFCONF returns, at least on * BSD-flavored systems, one entry per interface *address*; * if an interface has multiple addresses, we get multiple * entries for it). */ user_data.name = ifr->ifr_name; user_data.found = FALSE; g_list_foreach(il, search_for_if_cb, &user_data); if (user_data.found) goto next; /* * Get the interface flags. */ memset(&ifrflags, 0, sizeof ifrflags); strncpy(ifrflags.ifr_name, ifr->ifr_name, sizeof ifrflags.ifr_name); if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifrflags) < 0) { if (errno == ENXIO) goto next; sprintf(err_str, "SIOCGIFFLAGS error getting flags for interface %s: %s", ifr->ifr_name, strerror(errno)); goto fail; } /* * Skip interfaces that aren't up. */ if (!(ifrflags.ifr_flags & IFF_UP)) goto next; /* * Skip interfaces that we can't open with "libpcap". * Open with the minimum packet size - it appears that the * IRIX SIOCSNOOPLEN "ioctl" may fail if the capture length * supplied is too large, rather than just truncating it. */ pch = pcap_open_live(ifr->ifr_name, MIN_PACKET_SIZE, 0, 0, err_str); if (pch == NULL) goto next; pcap_close(pch); /* * If it's a loopback interface, add it at the end of the * list, otherwise add it after the last non-loopback * interface, so all loopback interfaces go at the end - we * don't want a loopback interface to be the default capture * device unless there are no non-loopback devices. */ if ((ifrflags.ifr_flags & IFF_LOOPBACK) || strncmp(ifr->ifr_name, "lo", 2) == 0) il = g_list_insert(il, g_strdup(ifr->ifr_name), -1); else { il = g_list_insert(il, g_strdup(ifr->ifr_name), nonloopback_pos); /* * Insert the next non-loopback interface after this * one. */ nonloopback_pos++; } next: #ifdef HAVE_SA_LEN ifr = (struct ifreq *) ((char *) ifr + ifr->ifr_addr.sa_len + IFNAMSIZ); #else ifr = (struct ifreq *) ((char *) ifr + sizeof(struct ifreq)); #endif } free(ifc.ifc_buf); close(sock); if (il == NULL) { /* * No interfaces found. */ *err = NO_INTERFACES_FOUND; } return il; fail: if (il != NULL) { g_list_foreach(il, free_if_cb, NULL); g_list_free(il); } free(ifc.ifc_buf); close(sock); *err = CANT_GET_INTERFACE_LIST; return NULL; } static void search_for_if_cb(gpointer data, gpointer user_data) { struct search_user_data *search_user_data = user_data; if (strcmp((char *)data, search_user_data->name) == 0) search_user_data->found = TRUE; } #else GList * get_interface_list(int *err, char *err_str) { GList *il = NULL; wchar_t *names; char *win95names; char newname[255]; int i, j, done; names = (wchar_t *)pcap_lookupdev(err_str); i = done = 0; if (names) { if (names[0]<256) { /* If names[0] is less than 256 it means the first byte is 0 This implies that we are using unicode characters */ do { j = 0; while (names[i] != 0) newname[j++] = names[i++]; i++; if (names[i] == 0) done = 1; newname[j++] = 0; il = g_list_append(il, g_strdup(newname)); } while (!done); } else { /* Otherwise we are in Windows 95/98 and using ascii(8 bit) characters */ do { win95names=names; j = 0; while (win95names[i] != 0) newname[j++] = win95names[i++]; i++; if (win95names[i] == 0) done = 1; newname[j++] = 0; il = g_list_append(il, g_strdup(newname)); } while (!done); } } return(il); } #endif static void free_if_cb(gpointer data, gpointer user_data) { g_free(data); } void free_interface_list(GList *if_list) { while (if_list != NULL) { g_free(if_list->data); if_list = g_list_remove_link(if_list, if_list); } } #endif /* HAVE_LIBPCAP */ const char* get_home_dir(void) { static const char *home = NULL; #ifdef WIN32 char *homedrive, *homepath; char *homestring; char *lastsep; #else struct passwd *pwd; #endif /* Return the cached value, if available */ if (home) return home; #ifdef WIN32 /* * XXX - should we use USERPROFILE anywhere in this process? * Is there a chance that it might be set but one or more of * HOMEDRIVE or HOMEPATH isn't set? */ homedrive = getenv("HOMEDRIVE"); if (homedrive != NULL) { homepath = getenv("HOMEPATH"); if (homepath != NULL) { /* * This is cached, so we don't need to worry about * allocating multiple ones of them. */ homestring = g_malloc(strlen(homedrive) + strlen(homepath) + 1); strcpy(homestring, homedrive); strcat(homestring, homepath); /* * Trim off any trailing slash or backslash. */ lastsep = find_last_pathname_separator(homestring); if (lastsep != NULL && *(lastsep + 1) == '\0') { /* * Last separator is the last character * in the string. Nuke it. */ *lastsep = '\0'; } home = homestring; } else home = homedrive; } else { /* * Try using "windir? */ home = "C:"; } #else home = getenv("HOME"); if (home == NULL) { /* * Get their home directory from the password file. * If we can't even find a password file entry for them, * use "/tmp". */ pwd = getpwuid(getuid()); if (pwd != NULL) { /* * This is cached, so we don't need to worry * about allocating multiple ones of them. */ home = g_strdup(pwd->pw_dir); } else home = "/tmp"; } #endif return home; }