/* $OpenBSD: pfctl_osfp.c,v 1.13 2005/11/12 19:44:42 deraadt Exp $ */ /* * Copyright (c) 2003 Mike Frantzen * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include "pfctl_parser.h" #include "pfctl.h" #ifndef MIN # define MIN(a,b) (((a) < (b)) ? (a) : (b)) #endif /* MIN */ #ifndef MAX # define MAX(a,b) (((a) > (b)) ? (a) : (b)) #endif /* MAX */ #if 0 # define DEBUG(fp, str, v...) \ fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \ (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v); #else # define DEBUG(fp, str, v...) ((void)0) #endif struct name_entry; LIST_HEAD(name_list, name_entry); struct name_entry { LIST_ENTRY(name_entry) nm_entry; int nm_num; char nm_name[PF_OSFP_LEN]; struct name_list nm_sublist; int nm_sublist_num; }; struct name_list classes = LIST_HEAD_INITIALIZER(&classes); int class_count; int fingerprint_count; void add_fingerprint(int, int, struct pf_osfp_ioctl *); struct name_entry *fingerprint_name_entry(struct name_list *, char *); void pfctl_flush_my_fingerprints(struct name_list *); char *get_field(char **, size_t *, int *); int get_int(char **, size_t *, int *, int *, const char *, int, int, const char *, int); int get_str(char **, size_t *, char **, const char *, int, const char *, int); int get_tcpopts(const char *, int, const char *, pf_tcpopts_t *, int *, int *, int *, int *, int *, int *); void import_fingerprint(struct pf_osfp_ioctl *); const char *print_ioctl(struct pf_osfp_ioctl *); void print_name_list(int, struct name_list *, const char *); void sort_name_list(int, struct name_list *); struct name_entry *lookup_name_list(struct name_list *, const char *); /* Load fingerprints from a file */ int pfctl_file_fingerprints(int dev, int opts, const char *fp_filename) { FILE *in; char *line; size_t len; int i, lineno = 0; int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale, wscale_mod, optcnt, ts0; pf_tcpopts_t packed_tcpopts; char *class, *version, *subtype, *desc, *tcpopts; struct pf_osfp_ioctl fp; pfctl_flush_my_fingerprints(&classes); if ((in = pfctl_fopen(fp_filename, "r")) == NULL) { warn("%s", fp_filename); return (1); } class = version = subtype = desc = tcpopts = NULL; if ((opts & PF_OPT_NOACTION) == 0) pfctl_clear_fingerprints(dev, opts); while ((line = fgetln(in, &len)) != NULL) { lineno++; if (class) free(class); if (version) free(version); if (subtype) free(subtype); if (desc) free(desc); if (tcpopts) free(tcpopts); class = version = subtype = desc = tcpopts = NULL; memset(&fp, 0, sizeof(fp)); /* Chop off comment */ for (i = 0; i < len; i++) if (line[i] == '#') { len = i; break; } /* Chop off whitespace */ while (len > 0 && isspace(line[len - 1])) len--; while (len > 0 && isspace(line[0])) { len--; line++; } if (len == 0) continue; #define T_DC 0x01 /* Allow don't care */ #define T_MSS 0x02 /* Allow MSS multiple */ #define T_MTU 0x04 /* Allow MTU multiple */ #define T_MOD 0x08 /* Allow modulus */ #define GET_INT(v, mod, n, ty, mx) \ get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno) #define GET_STR(v, n, mn) \ get_str(&line, &len, &v, n, mn, fp_filename, lineno) if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU| T_MOD, 0xffff) || GET_INT(ttl, NULL, "ttl", 0, 0xff) || GET_INT(df, NULL, "don't fragment frag", 0, 1) || GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC, 8192) || GET_STR(tcpopts, "TCP Options", 1) || GET_STR(class, "OS class", 1) || GET_STR(version, "OS version", 0) || GET_STR(subtype, "OS subtype", 0) || GET_STR(desc, "OS description", 2)) continue; if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts, &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0)) continue; if (len != 0) { fprintf(stderr, "%s:%d excess field\n", fp_filename, lineno); continue; } fp.fp_ttl = ttl; if (df) fp.fp_flags |= PF_OSFP_DF; switch (w_mod) { case 0: break; case T_DC: fp.fp_flags |= PF_OSFP_WSIZE_DC; break; case T_MSS: fp.fp_flags |= PF_OSFP_WSIZE_MSS; break; case T_MTU: fp.fp_flags |= PF_OSFP_WSIZE_MTU; break; case T_MOD: fp.fp_flags |= PF_OSFP_WSIZE_MOD; break; } fp.fp_wsize = window; switch (p_mod) { case T_DC: fp.fp_flags |= PF_OSFP_PSIZE_DC; break; case T_MOD: fp.fp_flags |= PF_OSFP_PSIZE_MOD; } fp.fp_psize = psize; switch (wscale_mod) { case T_DC: fp.fp_flags |= PF_OSFP_WSCALE_DC; break; case T_MOD: fp.fp_flags |= PF_OSFP_WSCALE_MOD; } fp.fp_wscale = wscale; switch (mss_mod) { case T_DC: fp.fp_flags |= PF_OSFP_MSS_DC; break; case T_MOD: fp.fp_flags |= PF_OSFP_MSS_MOD; break; } fp.fp_mss = mss; fp.fp_tcpopts = packed_tcpopts; fp.fp_optcnt = optcnt; if (ts0) fp.fp_flags |= PF_OSFP_TS0; if (class[0] == '@') fp.fp_os.fp_enflags |= PF_OSFP_GENERIC; if (class[0] == '*') fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL; if (class[0] == '@' || class[0] == '*') strlcpy(fp.fp_os.fp_class_nm, class + 1, sizeof(fp.fp_os.fp_class_nm)); else strlcpy(fp.fp_os.fp_class_nm, class, sizeof(fp.fp_os.fp_class_nm)); strlcpy(fp.fp_os.fp_version_nm, version, sizeof(fp.fp_os.fp_version_nm)); strlcpy(fp.fp_os.fp_subtype_nm, subtype, sizeof(fp.fp_os.fp_subtype_nm)); add_fingerprint(dev, opts, &fp); } if (class) free(class); if (version) free(version); if (subtype) free(subtype); if (desc) free(desc); fclose(in); if (opts & PF_OPT_VERBOSE2) printf("Loaded %d passive OS fingerprints\n", fingerprint_count); return (0); } /* flush the kernel's fingerprints */ void pfctl_clear_fingerprints(int dev, int opts) { if (ioctl(dev, DIOCOSFPFLUSH)) err(1, "DIOCOSFPFLUSH"); } /* flush pfctl's view of the fingerprints */ void pfctl_flush_my_fingerprints(struct name_list *list) { struct name_entry *nm; while ((nm = LIST_FIRST(list)) != NULL) { LIST_REMOVE(nm, nm_entry); pfctl_flush_my_fingerprints(&nm->nm_sublist); free(nm); } fingerprint_count = 0; class_count = 0; } /* Fetch the active fingerprints from the kernel */ int pfctl_load_fingerprints(int dev, int opts) { struct pf_osfp_ioctl io; int i; pfctl_flush_my_fingerprints(&classes); for (i = 0; i >= 0; i++) { memset(&io, 0, sizeof(io)); io.fp_getnum = i; if (ioctl(dev, DIOCOSFPGET, &io)) { if (errno == EBUSY) break; warn("DIOCOSFPGET"); return (1); } import_fingerprint(&io); } return (0); } /* List the fingerprints */ void pfctl_show_fingerprints(int opts) { if (LIST_FIRST(&classes) != NULL) { if (opts & PF_OPT_SHOWALL) { pfctl_print_title("OS FINGERPRINTS:"); printf("%u fingerprints loaded\n", fingerprint_count); } else { printf("Class\tVersion\tSubtype(subversion)\n"); printf("-----\t-------\t-------------------\n"); sort_name_list(opts, &classes); print_name_list(opts, &classes, ""); } } } /* Lookup a fingerprint */ pf_osfp_t pfctl_get_fingerprint(const char *name) { struct name_entry *nm, *class_nm, *version_nm, *subtype_nm; pf_osfp_t ret = PF_OSFP_NOMATCH; int class, version, subtype; int unp_class, unp_version, unp_subtype; int wr_len, version_len, subtype_len; char *ptr, *wr_name; if (strcasecmp(name, "unknown") == 0) return (PF_OSFP_UNKNOWN); /* Try most likely no version and no subtype */ if ((nm = lookup_name_list(&classes, name))) { class = nm->nm_num; version = PF_OSFP_ANY; subtype = PF_OSFP_ANY; goto found; } else { /* Chop it up into class/version/subtype */ if ((wr_name = strdup(name)) == NULL) err(1, "malloc"); if ((ptr = strchr(wr_name, ' ')) == NULL) { free(wr_name); return (PF_OSFP_NOMATCH); } *ptr++ = '\0'; /* The class is easy to find since it is delimited by a space */ if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) { free(wr_name); return (PF_OSFP_NOMATCH); } class = class_nm->nm_num; /* Try no subtype */ if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr))) { version = version_nm->nm_num; subtype = PF_OSFP_ANY; free(wr_name); goto found; } /* * There must be a version and a subtype. * We'll do some fuzzy matching to pick up things like: * Linux 2.2.14 (version=2.2 subtype=14) * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE) * Windows 2000 SP2 (version=2000 subtype=SP2) */ #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-') wr_len = strlen(ptr); LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) { version_len = strlen(version_nm->nm_name); if (wr_len < version_len + 2 || !CONNECTOR(ptr[version_len])) continue; /* first part of the string must be version */ if (strncasecmp(ptr, version_nm->nm_name, version_len)) continue; LIST_FOREACH(subtype_nm, &version_nm->nm_sublist, nm_entry) { subtype_len = strlen(subtype_nm->nm_name); if (wr_len != version_len + subtype_len + 1) continue; /* last part of the string must be subtype */ if (strcasecmp(&ptr[version_len+1], subtype_nm->nm_name) != 0) continue; /* Found it!! */ version = version_nm->nm_num; subtype = subtype_nm->nm_num; free(wr_name); goto found; } } free(wr_name); return (PF_OSFP_NOMATCH); } found: PF_OSFP_PACK(ret, class, version, subtype); if (ret != PF_OSFP_NOMATCH) { PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype); if (class != unp_class) { fprintf(stderr, "warning: fingerprint table overflowed " "classes\n"); return (PF_OSFP_NOMATCH); } if (version != unp_version) { fprintf(stderr, "warning: fingerprint table overflowed " "versions\n"); return (PF_OSFP_NOMATCH); } if (subtype != unp_subtype) { fprintf(stderr, "warning: fingerprint table overflowed " "subtypes\n"); return (PF_OSFP_NOMATCH); } } if (ret == PF_OSFP_ANY) { /* should never happen */ fprintf(stderr, "warning: fingerprint packed to 'any'\n"); return (PF_OSFP_NOMATCH); } return (ret); } /* Lookup a fingerprint name by ID */ char * pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len) { int class, version, subtype; struct name_list *list; struct name_entry *nm; char *class_name, *version_name, *subtype_name; class_name = version_name = subtype_name = NULL; if (fp == PF_OSFP_UNKNOWN) { strlcpy(buf, "unknown", len); return (buf); } if (fp == PF_OSFP_ANY) { strlcpy(buf, "any", len); return (buf); } PF_OSFP_UNPACK(fp, class, version, subtype); if (class >= (1 << _FP_CLASS_BITS) || version >= (1 << _FP_VERSION_BITS) || subtype >= (1 << _FP_SUBTYPE_BITS)) { warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp); strlcpy(buf, "nomatch", len); return (buf); } LIST_FOREACH(nm, &classes, nm_entry) { if (nm->nm_num == class) { class_name = nm->nm_name; if (version == PF_OSFP_ANY) goto found; list = &nm->nm_sublist; LIST_FOREACH(nm, list, nm_entry) { if (nm->nm_num == version) { version_name = nm->nm_name; if (subtype == PF_OSFP_ANY) goto found; list = &nm->nm_sublist; LIST_FOREACH(nm, list, nm_entry) { if (nm->nm_num == subtype) { subtype_name = nm->nm_name; goto found; } } /* foreach subtype */ strlcpy(buf, "nomatch", len); return (buf); } } /* foreach version */ strlcpy(buf, "nomatch", len); return (buf); } } /* foreach class */ strlcpy(buf, "nomatch", len); return (buf); found: snprintf(buf, len, "%s", class_name); if (version_name) { strlcat(buf, " ", len); strlcat(buf, version_name, len); if (subtype_name) { if (strchr(version_name, ' ')) strlcat(buf, " ", len); else if (strchr(version_name, '.') && isdigit(*subtype_name)) strlcat(buf, ".", len); else strlcat(buf, " ", len); strlcat(buf, subtype_name, len); } } return (buf); } /* lookup a name in a list */ struct name_entry * lookup_name_list(struct name_list *list, const char *name) { struct name_entry *nm; LIST_FOREACH(nm, list, nm_entry) if (strcasecmp(name, nm->nm_name) == 0) return (nm); return (NULL); } void add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp) { struct pf_osfp_ioctl fptmp; struct name_entry *nm_class, *nm_version, *nm_subtype; int class, version, subtype; /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */ #define EXPAND(field) do { \ int _dot = -1, _start = -1, _end = -1, _i = 0; \ /* pick major version out of #.# */ \ if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \ _dot = fp->field[_i] - '0'; \ _i += 2; \ } \ if (isdigit(fp->field[_i])) \ _start = fp->field[_i++] - '0'; \ else \ break; \ if (isdigit(fp->field[_i])) \ _start = (_start * 10) + fp->field[_i++] - '0'; \ if (fp->field[_i++] != '-') \ break; \ if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \ fp->field[_i] - '0' == _dot) \ _i += 2; \ else if (_dot != -1) \ break; \ if (isdigit(fp->field[_i])) \ _end = fp->field[_i++] - '0'; \ else \ break; \ if (isdigit(fp->field[_i])) \ _end = (_end * 10) + fp->field[_i++] - '0'; \ if (isdigit(fp->field[_i])) \ _end = (_end * 10) + fp->field[_i++] - '0'; \ if (fp->field[_i] != '\0') \ break; \ memcpy(&fptmp, fp, sizeof(fptmp)); \ for (;_start <= _end; _start++) { \ memset(fptmp.field, 0, sizeof(fptmp.field)); \ fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \ if (_dot == -1) \ snprintf(fptmp.field, sizeof(fptmp.field), \ "%d", _start); \ else \ snprintf(fptmp.field, sizeof(fptmp.field), \ "%d.%d", _dot, _start); \ add_fingerprint(dev, opts, &fptmp); \ } \ } while(0) /* We allow "#-#" as a version or subtype and we'll expand it */ EXPAND(fp_os.fp_version_nm); EXPAND(fp_os.fp_subtype_nm); if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0) errx(1, "fingerprint class \"nomatch\" is reserved"); version = PF_OSFP_ANY; subtype = PF_OSFP_ANY; nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); if (nm_class->nm_num == 0) nm_class->nm_num = ++class_count; class = nm_class->nm_num; nm_version = fingerprint_name_entry(&nm_class->nm_sublist, fp->fp_os.fp_version_nm); if (nm_version) { if (nm_version->nm_num == 0) nm_version->nm_num = ++nm_class->nm_sublist_num; version = nm_version->nm_num; nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, fp->fp_os.fp_subtype_nm); if (nm_subtype) { if (nm_subtype->nm_num == 0) nm_subtype->nm_num = ++nm_version->nm_sublist_num; subtype = nm_subtype->nm_num; } } DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype, print_ioctl(fp)); PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype); fingerprint_count++; #ifdef FAKE_PF_KERNEL /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */ if ((errno = pf_osfp_add(fp))) #else if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp)) #endif /* FAKE_PF_KERNEL */ { if (errno == EEXIST) { warn("Duplicate signature for %s %s %s", fp->fp_os.fp_class_nm, fp->fp_os.fp_version_nm, fp->fp_os.fp_subtype_nm); } else { err(1, "DIOCOSFPADD"); } } } /* import a fingerprint from the kernel */ void import_fingerprint(struct pf_osfp_ioctl *fp) { struct name_entry *nm_class, *nm_version, *nm_subtype; int class, version, subtype; PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype); nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); if (nm_class->nm_num == 0) { nm_class->nm_num = class; class_count = MAX(class_count, class); } nm_version = fingerprint_name_entry(&nm_class->nm_sublist, fp->fp_os.fp_version_nm); if (nm_version) { if (nm_version->nm_num == 0) { nm_version->nm_num = version; nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num, version); } nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, fp->fp_os.fp_subtype_nm); if (nm_subtype) { if (nm_subtype->nm_num == 0) { nm_subtype->nm_num = subtype; nm_version->nm_sublist_num = MAX(nm_version->nm_sublist_num, subtype); } } } fingerprint_count++; DEBUG(fp, "import signature %d:%d:%d", class, version, subtype); } /* Find an entry for a fingerprints class/version/subtype */ struct name_entry * fingerprint_name_entry(struct name_list *list, char *name) { struct name_entry *nm_entry; if (name == NULL || strlen(name) == 0) return (NULL); LIST_FOREACH(nm_entry, list, nm_entry) { if (strcasecmp(nm_entry->nm_name, name) == 0) { /* We'll move this to the front of the list later */ LIST_REMOVE(nm_entry, nm_entry); break; } } if (nm_entry == NULL) { nm_entry = calloc(1, sizeof(*nm_entry)); if (nm_entry == NULL) err(1, "calloc"); LIST_INIT(&nm_entry->nm_sublist); strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name)); } LIST_INSERT_HEAD(list, nm_entry, nm_entry); return (nm_entry); } void print_name_list(int opts, struct name_list *nml, const char *prefix) { char newprefix[32]; struct name_entry *nm; LIST_FOREACH(nm, nml, nm_entry) { snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix, nm->nm_name); printf("%s\n", newprefix); print_name_list(opts, &nm->nm_sublist, newprefix); } } void sort_name_list(int opts, struct name_list *nml) { struct name_list new; struct name_entry *nm, *nmsearch, *nmlast; /* yes yes, it's a very slow sort. so sue me */ LIST_INIT(&new); while ((nm = LIST_FIRST(nml)) != NULL) { LIST_REMOVE(nm, nm_entry); nmlast = NULL; LIST_FOREACH(nmsearch, &new, nm_entry) { if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) { LIST_INSERT_BEFORE(nmsearch, nm, nm_entry); break; } nmlast = nmsearch; } if (nmsearch == NULL) { if (nmlast) LIST_INSERT_AFTER(nmlast, nm, nm_entry); else LIST_INSERT_HEAD(&new, nm, nm_entry); } sort_name_list(opts, &nm->nm_sublist); } nmlast = NULL; while ((nm = LIST_FIRST(&new)) != NULL) { LIST_REMOVE(nm, nm_entry); if (nmlast == NULL) LIST_INSERT_HEAD(nml, nm, nm_entry); else LIST_INSERT_AFTER(nmlast, nm, nm_entry); nmlast = nm; } } /* parse the next integer in a formatted config file line */ int get_int(char **line, size_t *len, int *var, int *mod, const char *name, int flags, int max, const char *filename, int lineno) { int fieldlen, i; char *field; long val = 0; if (mod) *mod = 0; *var = 0; field = get_field(line, len, &fieldlen); if (field == NULL) return (1); if (fieldlen == 0) { fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name); return (1); } i = 0; if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*') && fieldlen >= 1) { switch (*field) { case 'S': if (mod && (flags & T_MSS)) *mod = T_MSS; if (fieldlen == 1) return (0); break; case 'T': if (mod && (flags & T_MTU)) *mod = T_MTU; if (fieldlen == 1) return (0); break; case '*': if (fieldlen != 1) { fprintf(stderr, "%s:%d long '%c' %s\n", filename, lineno, *field, name); return (1); } if (mod && (flags & T_DC)) { *mod = T_DC; return (0); } case '%': if (mod && (flags & T_MOD)) *mod = T_MOD; if (fieldlen == 1) { fprintf(stderr, "%s:%d modulus %s must have a " "value\n", filename, lineno, name); return (1); } break; } if (mod == NULL || *mod == 0) { fprintf(stderr, "%s:%d does not allow %c' %s\n", filename, lineno, *field, name); return (1); } i++; } for (; i < fieldlen; i++) { if (field[i] < '0' || field[i] > '9') { fprintf(stderr, "%s:%d non-digit character in %s\n", filename, lineno, name); return (1); } val = val * 10 + field[i] - '0'; if (val < 0) { fprintf(stderr, "%s:%d %s overflowed\n", filename, lineno, name); return (1); } } if (val > max) { fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno, name, val, max); return (1); } *var = (int)val; return (0); } /* parse the next string in a formatted config file line */ int get_str(char **line, size_t *len, char **v, const char *name, int minlen, const char *filename, int lineno) { int fieldlen; char *ptr; ptr = get_field(line, len, &fieldlen); if (ptr == NULL) return (1); if (fieldlen < minlen) { fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name); return (1); } if ((*v = malloc(fieldlen + 1)) == NULL) { perror("malloc()"); return (1); } memcpy(*v, ptr, fieldlen); (*v)[fieldlen] = '\0'; return (0); } /* Parse out the TCP opts */ int get_tcpopts(const char *filename, int lineno, const char *tcpopts, pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale, int *wscale_mod, int *ts0) { int i, opt; *packed = 0; *optcnt = 0; *wscale = 0; *wscale_mod = T_DC; *mss = 0; *mss_mod = T_DC; *ts0 = 0; if (strcmp(tcpopts, ".") == 0) return (0); for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) { switch ((opt = toupper(tcpopts[i++]))) { case 'N': /* FALLTHROUGH */ case 'S': *packed = (*packed << PF_OSFP_TCPOPT_BITS) | (opt == 'N' ? PF_OSFP_TCPOPT_NOP : PF_OSFP_TCPOPT_SACK); break; case 'W': /* FALLTHROUGH */ case 'M': { int *this_mod, *this; if (opt == 'W') { this = wscale; this_mod = wscale_mod; } else { this = mss; this_mod = mss_mod; } *this = 0; *this_mod = 0; *packed = (*packed << PF_OSFP_TCPOPT_BITS) | (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE : PF_OSFP_TCPOPT_MSS); if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' || tcpopts[i + 1] == ',')) { *this_mod = T_DC; i++; break; } if (tcpopts[i] == '%') { *this_mod = T_MOD; i++; } do { if (!isdigit(tcpopts[i])) { fprintf(stderr, "%s:%d unknown " "character '%c' in %c TCP opt\n", filename, lineno, tcpopts[i], opt); return (1); } *this = (*this * 10) + tcpopts[i++] - '0'; } while(tcpopts[i] != ',' && tcpopts[i] != '\0'); break; } case 'T': if (tcpopts[i] == '0') { *ts0 = 1; i++; } *packed = (*packed << PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_TS; break; } (*optcnt) ++; if (tcpopts[i] == '\0') break; if (tcpopts[i] != ',') { fprintf(stderr, "%s:%d unknown option to %c TCP opt\n", filename, lineno, opt); return (1); } i++; } return (0); } /* rip the next field ouf of a formatted config file line */ char * get_field(char **line, size_t *len, int *fieldlen) { char *ret, *ptr = *line; size_t plen = *len; while (plen && isspace(*ptr)) { plen--; ptr++; } ret = ptr; *fieldlen = 0; for (; plen > 0 && *ptr != ':'; plen--, ptr++) (*fieldlen)++; if (plen) { *line = ptr + 1; *len = plen - 1; } else { *len = 0; } while (*fieldlen && isspace(ret[*fieldlen - 1])) (*fieldlen)--; return (ret); } const char * print_ioctl(struct pf_osfp_ioctl *fp) { static char buf[1024]; char tmp[32]; int i, opt; *buf = '\0'; if (fp->fp_flags & PF_OSFP_WSIZE_DC) strlcat(buf, "*", sizeof(buf)); else if (fp->fp_flags & PF_OSFP_WSIZE_MSS) strlcat(buf, "S", sizeof(buf)); else if (fp->fp_flags & PF_OSFP_WSIZE_MTU) strlcat(buf, "T", sizeof(buf)); else { if (fp->fp_flags & PF_OSFP_WSIZE_MOD) strlcat(buf, "%", sizeof(buf)); snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize); strlcat(buf, tmp, sizeof(buf)); } strlcat(buf, ":", sizeof(buf)); snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl); strlcat(buf, tmp, sizeof(buf)); strlcat(buf, ":", sizeof(buf)); if (fp->fp_flags & PF_OSFP_DF) strlcat(buf, "1", sizeof(buf)); else strlcat(buf, "0", sizeof(buf)); strlcat(buf, ":", sizeof(buf)); if (fp->fp_flags & PF_OSFP_PSIZE_DC) strlcat(buf, "*", sizeof(buf)); else { if (fp->fp_flags & PF_OSFP_PSIZE_MOD) strlcat(buf, "%", sizeof(buf)); snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize); strlcat(buf, tmp, sizeof(buf)); } strlcat(buf, ":", sizeof(buf)); if (fp->fp_optcnt == 0) strlcat(buf, ".", sizeof(buf)); for (i = fp->fp_optcnt - 1; i >= 0; i--) { opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS); opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1; switch (opt) { case PF_OSFP_TCPOPT_NOP: strlcat(buf, "N", sizeof(buf)); break; case PF_OSFP_TCPOPT_SACK: strlcat(buf, "S", sizeof(buf)); break; case PF_OSFP_TCPOPT_TS: strlcat(buf, "T", sizeof(buf)); if (fp->fp_flags & PF_OSFP_TS0) strlcat(buf, "0", sizeof(buf)); break; case PF_OSFP_TCPOPT_MSS: strlcat(buf, "M", sizeof(buf)); if (fp->fp_flags & PF_OSFP_MSS_DC) strlcat(buf, "*", sizeof(buf)); else { if (fp->fp_flags & PF_OSFP_MSS_MOD) strlcat(buf, "%", sizeof(buf)); snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss); strlcat(buf, tmp, sizeof(buf)); } break; case PF_OSFP_TCPOPT_WSCALE: strlcat(buf, "W", sizeof(buf)); if (fp->fp_flags & PF_OSFP_WSCALE_DC) strlcat(buf, "*", sizeof(buf)); else { if (fp->fp_flags & PF_OSFP_WSCALE_MOD) strlcat(buf, "%", sizeof(buf)); snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale); strlcat(buf, tmp, sizeof(buf)); } break; } if (i != 0) strlcat(buf, ",", sizeof(buf)); } strlcat(buf, ":", sizeof(buf)); strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf)); strlcat(buf, ":", sizeof(buf)); strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf)); strlcat(buf, ":", sizeof(buf)); strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf)); strlcat(buf, ":", sizeof(buf)); snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt, (long long int)fp->fp_tcpopts); strlcat(buf, tmp, sizeof(buf)); return (buf); }