/* * utils.c * * 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. * * Authors: Alexey Kuznetsov, * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "rt_names.h" #include "utils.h" #include "namespace.h" int timestamp_short = 0; int get_integer(int *val, const char *arg, int base) { long res; char *ptr; if (!arg || !*arg) return -1; res = strtol(arg, &ptr, base); /* If there were no digits at all, strtol() stores * the original value of nptr in *endptr (and returns 0). * In particular, if *nptr is not '\0' but **endptr is '\0' on return, * the entire string is valid. */ if (!ptr || ptr == arg || *ptr) return -1; /* If an underflow occurs, strtol() returns LONG_MIN. * If an overflow occurs, strtol() returns LONG_MAX. * In both cases, errno is set to ERANGE. */ if ((res == LONG_MAX || res == LONG_MIN) && errno == ERANGE) return -1; /* Outside range of int */ if (res < INT_MIN || res > INT_MAX) return -1; *val = res; return 0; } int mask2bits(__u32 netmask) { unsigned bits = 0; __u32 mask = ntohl(netmask); __u32 host = ~mask; /* a valid netmask must be 2^n - 1 */ if ((host & (host + 1)) != 0) return -1; for (; mask; mask <<= 1) ++bits; return bits; } static int get_netmask(unsigned *val, const char *arg, int base) { inet_prefix addr; if (!get_unsigned(val, arg, base)) return 0; /* try coverting dotted quad to CIDR */ if (!get_addr_1(&addr, arg, AF_INET) && addr.family == AF_INET) { int b = mask2bits(addr.data[0]); if (b >= 0) { *val = b; return 0; } } return -1; } int get_unsigned(unsigned *val, const char *arg, int base) { unsigned long res; char *ptr; if (!arg || !*arg) return -1; res = strtoul(arg, &ptr, base); /* empty string or trailing non-digits */ if (!ptr || ptr == arg || *ptr) return -1; /* overflow */ if (res == ULONG_MAX && errno == ERANGE) return -1; /* out side range of unsigned */ if (res > UINT_MAX) return -1; *val = res; return 0; } /* * get_time_rtt is "translated" from a similar routine "get_time" in * tc_util.c. We don't use the exact same routine because tc passes * microseconds to the kernel and the callers of get_time_rtt want to * pass milliseconds (standard unit for rtt values since 2.6.27), and * have a different assumption for the units of a "raw" number. */ int get_time_rtt(unsigned *val, const char *arg, int *raw) { double t; unsigned long res; char *p; if (strchr(arg, '.') != NULL) { t = strtod(arg, &p); if (t < 0.0) return -1; /* no digits? */ if (!p || p == arg) return -1; /* over/underflow */ if ((t == HUGE_VALF || t == HUGE_VALL) && errno == ERANGE) return -1; } else { res = strtoul(arg, &p, 0); /* empty string? */ if (!p || p == arg) return -1; /* overflow */ if (res == ULONG_MAX && errno == ERANGE) return -1; t = (double)res; } if (p == arg) return -1; *raw = 1; if (*p) { *raw = 0; if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 || strcasecmp(p, "secs")==0) t *= 1000; else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 || strcasecmp(p, "msecs") == 0) t *= 1.0; /* allow suffix, do nothing */ else return -1; } /* emulate ceil() without having to bring-in -lm and always be >= 1 */ *val = t; if (*val < t) *val += 1; return 0; } int get_u64(__u64 *val, const char *arg, int base) { unsigned long long res; char *ptr; if (!arg || !*arg) return -1; res = strtoull(arg, &ptr, base); /* empty string or trailing non-digits */ if (!ptr || ptr == arg || *ptr) return -1; /* overflow */ if (res == ULLONG_MAX && errno == ERANGE) return -1; /* in case ULL is 128 bits */ if (res > 0xFFFFFFFFFFFFFFFFULL) return -1; *val = res; return 0; } int get_u32(__u32 *val, const char *arg, int base) { unsigned long res; char *ptr; if (!arg || !*arg) return -1; res = strtoul(arg, &ptr, base); /* empty string or trailing non-digits */ if (!ptr || ptr == arg || *ptr) return -1; /* overflow */ if (res == ULONG_MAX && errno == ERANGE) return -1; /* in case UL > 32 bits */ if (res > 0xFFFFFFFFUL) return -1; *val = res; return 0; } int get_u16(__u16 *val, const char *arg, int base) { unsigned long res; char *ptr; if (!arg || !*arg) return -1; res = strtoul(arg, &ptr, base); /* empty string or trailing non-digits */ if (!ptr || ptr == arg || *ptr) return -1; /* overflow */ if (res == ULONG_MAX && errno == ERANGE) return -1; if (res > 0xFFFFUL) return -1; *val = res; return 0; } int get_u8(__u8 *val, const char *arg, int base) { unsigned long res; char *ptr; if (!arg || !*arg) return -1; res = strtoul(arg, &ptr, base); /* empty string or trailing non-digits */ if (!ptr || ptr == arg || *ptr) return -1; /* overflow */ if (res == ULONG_MAX && errno == ERANGE) return -1; if (res > 0xFFUL) return -1; *val = res; return 0; } int get_s32(__s32 *val, const char *arg, int base) { long res; char *ptr; errno = 0; if (!arg || !*arg) return -1; res = strtol(arg, &ptr, base); if (!ptr || ptr == arg || *ptr) return -1; if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE) return -1; if (res > INT32_MAX || res < INT32_MIN) return -1; *val = res; return 0; } int get_s16(__s16 *val, const char *arg, int base) { long res; char *ptr; if (!arg || !*arg) return -1; res = strtol(arg, &ptr, base); if (!ptr || ptr == arg || *ptr) return -1; if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE) return -1; if (res > 0x7FFF || res < -0x8000) return -1; *val = res; return 0; } int get_s8(__s8 *val, const char *arg, int base) { long res; char *ptr; if (!arg || !*arg) return -1; res = strtol(arg, &ptr, base); if (!ptr || ptr == arg || *ptr) return -1; if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE) return -1; if (res > 0x7F || res < -0x80) return -1; *val = res; return 0; } /* This uses a non-standard parsing (ie not inet_aton, or inet_pton) * because of legacy choice to parse 10.8 as 10.8.0.0 not 10.0.0.8 */ static int get_addr_ipv4(__u8 *ap, const char *cp) { int i; for (i = 0; i < 4; i++) { unsigned long n; char *endp; n = strtoul(cp, &endp, 0); if (n > 255) return -1; /* bogus network value */ if (endp == cp) /* no digits */ return -1; ap[i] = n; if (*endp == '\0') break; if (i == 3 || *endp != '.') return -1; /* extra characters */ cp = endp + 1; } return 1; } int get_addr64(__u64 *ap, const char *cp) { int i; union { __u16 v16[4]; __u64 v64; } val; for (i = 0; i < 4; i++) { unsigned long n; char *endp; n = strtoul(cp, &endp, 16); if (n > 0xffff) return -1; /* bogus network value */ if (endp == cp) /* no digits */ return -1; val.v16[i] = htons(n); if (*endp == '\0') break; if (i == 3 || *endp != ':') return -1; /* extra characters */ cp = endp + 1; } *ap = val.v64; return 1; } int get_addr_1(inet_prefix *addr, const char *name, int family) { memset(addr, 0, sizeof(*addr)); if (strcmp(name, "default") == 0 || strcmp(name, "all") == 0 || strcmp(name, "any") == 0) { if ((family == AF_DECnet) || (family == AF_MPLS)) return -1; addr->family = family; addr->bytelen = (family == AF_INET6 ? 16 : 4); addr->bitlen = -1; return 0; } if (family == AF_PACKET) { int len; len = ll_addr_a2n((char *)&addr->data, sizeof(addr->data), name); if (len < 0) return -1; addr->family = AF_PACKET; addr->bytelen = len; addr->bitlen = len * 8; return 0; } if (strchr(name, ':')) { addr->family = AF_INET6; if (family != AF_UNSPEC && family != AF_INET6) return -1; if (inet_pton(AF_INET6, name, addr->data) <= 0) return -1; addr->bytelen = 16; addr->bitlen = -1; return 0; } if (family == AF_DECnet) { struct dn_naddr dna; addr->family = AF_DECnet; if (dnet_pton(AF_DECnet, name, &dna) <= 0) return -1; memcpy(addr->data, dna.a_addr, 2); addr->bytelen = 2; addr->bitlen = -1; return 0; } if (family == AF_MPLS) { int i; addr->family = AF_MPLS; if (mpls_pton(AF_MPLS, name, addr->data) <= 0) return -1; addr->bytelen = 4; addr->bitlen = 20; /* How many bytes do I need? */ for (i = 0; i < 8; i++) { if (ntohl(addr->data[i]) & MPLS_LS_S_MASK) { addr->bytelen = (i + 1)*4; break; } } return 0; } addr->family = AF_INET; if (family != AF_UNSPEC && family != AF_INET) return -1; if (get_addr_ipv4((__u8 *)addr->data, name) <= 0) return -1; addr->bytelen = 4; addr->bitlen = -1; return 0; } int af_bit_len(int af) { switch (af) { case AF_INET6: return 128; case AF_INET: return 32; case AF_DECnet: return 16; case AF_IPX: return 80; case AF_MPLS: return 20; } return 0; } int af_byte_len(int af) { return af_bit_len(af) / 8; } int get_prefix_1(inet_prefix *dst, char *arg, int family) { int err; unsigned plen; char *slash; memset(dst, 0, sizeof(*dst)); if (strcmp(arg, "default") == 0 || strcmp(arg, "any") == 0 || strcmp(arg, "all") == 0) { if ((family == AF_DECnet) || (family == AF_MPLS)) return -1; dst->family = family; dst->bytelen = 0; dst->bitlen = 0; return 0; } slash = strchr(arg, '/'); if (slash) *slash = 0; err = get_addr_1(dst, arg, family); if (err == 0) { dst->bitlen = af_bit_len(dst->family); if (slash) { if (get_netmask(&plen, slash+1, 0) || plen > dst->bitlen) { err = -1; goto done; } dst->flags |= PREFIXLEN_SPECIFIED; dst->bitlen = plen; } } done: if (slash) *slash = '/'; return err; } int get_addr(inet_prefix *dst, const char *arg, int family) { if (get_addr_1(dst, arg, family)) { fprintf(stderr, "Error: %s address is expected rather than \"%s\".\n", family_name(family) ,arg); exit(1); } return 0; } int get_prefix(inet_prefix *dst, char *arg, int family) { if (family == AF_PACKET) { fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg); exit(1); } if (get_prefix_1(dst, arg, family)) { fprintf(stderr, "Error: %s prefix is expected rather than \"%s\".\n", family_name(family) ,arg); exit(1); } return 0; } __u32 get_addr32(const char *name) { inet_prefix addr; if (get_addr_1(&addr, name, AF_INET)) { fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name); exit(1); } return addr.data[0]; } void incomplete_command(void) { fprintf(stderr, "Command line is not complete. Try option \"help\"\n"); exit(-1); } void missarg(const char *key) { fprintf(stderr, "Error: argument \"%s\" is required\n", key); exit(-1); } void invarg(const char *msg, const char *arg) { fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg); exit(-1); } void duparg(const char *key, const char *arg) { fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg); exit(-1); } void duparg2(const char *key, const char *arg) { fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg); exit(-1); } int matches(const char *cmd, const char *pattern) { int len = strlen(cmd); if (len > strlen(pattern)) return -1; return memcmp(pattern, cmd, len); } int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits) { const __u32 *a1 = a->data; const __u32 *a2 = b->data; int words = bits >> 0x05; bits &= 0x1f; if (words) if (memcmp(a1, a2, words << 2)) return -1; if (bits) { __u32 w1, w2; __u32 mask; w1 = a1[words]; w2 = a2[words]; mask = htonl((0xffffffff) << (0x20 - bits)); if ((w1 ^ w2) & mask) return 1; } return 0; } int __iproute2_hz_internal; int __get_hz(void) { char name[1024]; int hz = 0; FILE *fp; if (getenv("HZ")) return atoi(getenv("HZ")) ? : HZ; if (getenv("PROC_NET_PSCHED")) { snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED")); } else if (getenv("PROC_ROOT")) { snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT")); } else { strcpy(name, "/proc/net/psched"); } fp = fopen(name, "r"); if (fp) { unsigned nom, denom; if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2) if (nom == 1000000) hz = denom; fclose(fp); } if (hz) return hz; return HZ; } int __iproute2_user_hz_internal; int __get_user_hz(void) { return sysconf(_SC_CLK_TCK); } const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen) { switch (af) { case AF_INET: case AF_INET6: return inet_ntop(af, addr, buf, buflen); case AF_MPLS: return mpls_ntop(af, addr, buf, buflen); case AF_IPX: return ipx_ntop(af, addr, buf, buflen); case AF_DECnet: { struct dn_naddr dna = { 2, { 0, 0, }}; memcpy(dna.a_addr, addr, 2); return dnet_ntop(af, &dna, buf, buflen); } case AF_PACKET: return ll_addr_n2a(addr, len, ARPHRD_VOID, buf, buflen); default: return "???"; } } int read_family(const char *name) { int family = AF_UNSPEC; if (strcmp(name, "inet") == 0) family = AF_INET; else if (strcmp(name, "inet6") == 0) family = AF_INET6; else if (strcmp(name, "dnet") == 0) family = AF_DECnet; else if (strcmp(name, "link") == 0) family = AF_PACKET; else if (strcmp(name, "ipx") == 0) family = AF_IPX; else if (strcmp(name, "mpls") == 0) family = AF_MPLS; else if (strcmp(name, "bridge") == 0) family = AF_BRIDGE; return family; } const char *family_name(int family) { if (family == AF_INET) return "inet"; if (family == AF_INET6) return "inet6"; if (family == AF_DECnet) return "dnet"; if (family == AF_PACKET) return "link"; if (family == AF_IPX) return "ipx"; if (family == AF_MPLS) return "mpls"; if (family == AF_BRIDGE) return "bridge"; return "???"; } #ifdef RESOLVE_HOSTNAMES struct namerec { struct namerec *next; const char *name; inet_prefix addr; }; #define NHASH 257 static struct namerec *nht[NHASH]; static const char *resolve_address(const void *addr, int len, int af) { struct namerec *n; struct hostent *h_ent; unsigned hash; static int notfirst; if (af == AF_INET6 && ((__u32*)addr)[0] == 0 && ((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) { af = AF_INET; addr += 12; len = 4; } hash = *(__u32 *)(addr + len - 4) % NHASH; for (n = nht[hash]; n; n = n->next) { if (n->addr.family == af && n->addr.bytelen == len && memcmp(n->addr.data, addr, len) == 0) return n->name; } if ((n = malloc(sizeof(*n))) == NULL) return NULL; n->addr.family = af; n->addr.bytelen = len; n->name = NULL; memcpy(n->addr.data, addr, len); n->next = nht[hash]; nht[hash] = n; if (++notfirst == 1) sethostent(1); fflush(stdout); if ((h_ent = gethostbyaddr(addr, len, af)) != NULL) n->name = strdup(h_ent->h_name); /* Even if we fail, "negative" entry is remembered. */ return n->name; } #endif const char *format_host(int af, int len, const void *addr, char *buf, int buflen) { #ifdef RESOLVE_HOSTNAMES if (resolve_hosts) { const char *n; len = len <= 0 ? af_byte_len(af) : len; if (len > 0 && (n = resolve_address(addr, len, af)) != NULL) return n; } #endif return rt_addr_n2a(af, len, addr, buf, buflen); } char *hexstring_n2a(const __u8 *str, int len, char *buf, int blen) { char *ptr = buf; int i; for (i=0; i 1) { unsigned int tmp; char tmpstr[3]; strncpy(tmpstr, str, 2); tmpstr[2] = '\0'; tmp = strtoul(tmpstr, &endptr, 16); if (errno != 0 || tmp > 0xFF || *endptr != '\0') return NULL; buf[cnt++] = tmp; str += 2; } return buf; } int addr64_n2a(__u64 addr, char *buff, size_t len) { __u16 *words = (__u16 *)&addr; __u16 v; int i, ret; size_t written = 0; char *sep = ":"; for (i = 0; i < 4; i++) { v = ntohs(words[i]); if (i == 3) sep = ""; ret = snprintf(&buff[written], len - written, "%x%s", v, sep); if (ret < 0) return ret; written += ret; } return written; } int print_timestamp(FILE *fp) { struct timeval tv; struct tm *tm; gettimeofday(&tv, NULL); tm = localtime(&tv.tv_sec); if (timestamp_short) { char tshort[40]; strftime(tshort, sizeof(tshort), "%Y-%m-%dT%H:%M:%S", tm); fprintf(fp, "[%s.%06ld] ", tshort, tv.tv_usec); } else { char *tstr = asctime(tm); tstr[strlen(tstr)-1] = 0; fprintf(fp, "Timestamp: %s %ld usec\n", tstr, tv.tv_usec); } return 0; } int cmdlineno; /* Like glibc getline but handle continuation lines and comments */ ssize_t getcmdline(char **linep, size_t *lenp, FILE *in) { ssize_t cc; char *cp; if ((cc = getline(linep, lenp, in)) < 0) return cc; /* eof or error */ ++cmdlineno; cp = strchr(*linep, '#'); if (cp) *cp = '\0'; while ((cp = strstr(*linep, "\\\n")) != NULL) { char *line1 = NULL; size_t len1 = 0; ssize_t cc1; if ((cc1 = getline(&line1, &len1, in)) < 0) { fprintf(stderr, "Missing continuation line\n"); return cc1; } ++cmdlineno; *cp = 0; cp = strchr(line1, '#'); if (cp) *cp = '\0'; *lenp = strlen(*linep) + strlen(line1) + 1; *linep = realloc(*linep, *lenp); if (!*linep) { fprintf(stderr, "Out of memory\n"); *lenp = 0; return -1; } cc += cc1 - 2; strcat(*linep, line1); free(line1); } return cc; } /* split command line into argument vector */ int makeargs(char *line, char *argv[], int maxargs) { static const char ws[] = " \t\r\n"; char *cp; int argc = 0; for (cp = line + strspn(line, ws); *cp; cp += strspn(cp, ws)) { if (argc >= (maxargs - 1)) { fprintf(stderr, "Too many arguments to command\n"); exit(1); } /* word begins with quote */ if (*cp == '\'' || *cp == '"') { char quote = *cp++; argv[argc++] = cp; /* find ending quote */ cp = strchr(cp, quote); if (cp == NULL) { fprintf(stderr, "Unterminated quoted string\n"); exit(1); } *cp++ = 0; continue; } argv[argc++] = cp; /* find end of word */ cp += strcspn(cp, ws); *cp++ = 0; } argv[argc] = NULL; return argc; } int inet_get_addr(const char *src, __u32 *dst, struct in6_addr *dst6) { if (strchr(src, ':')) return inet_pton(AF_INET6, src, dst6); else return inet_pton(AF_INET, src, dst); } void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n) { char *tstr; time_t secs = ((__u32*)NLMSG_DATA(n))[0]; long usecs = ((__u32*)NLMSG_DATA(n))[1]; tstr = asctime(localtime(&secs)); tstr[strlen(tstr)-1] = 0; fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs); } static int on_netns(char *nsname, void *arg) { struct netns_func *f = arg; if (netns_switch(nsname)) return -1; return f->func(nsname, f->arg); } static int on_netns_label(char *nsname, void *arg) { printf("\nnetns: %s\n", nsname); return on_netns(nsname, arg); } int do_each_netns(int (*func)(char *nsname, void *arg), void *arg, bool show_label) { struct netns_func nsf = { .func = func, .arg = arg }; if (show_label) return netns_foreach(on_netns_label, &nsf); return netns_foreach(on_netns, &nsf); } char *int_to_str(int val, char *buf) { sprintf(buf, "%d", val); return buf; }