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-rw-r--r--networking/traceroute.c725
1 files changed, 166 insertions, 559 deletions
diff --git a/networking/traceroute.c b/networking/traceroute.c
index 958299a..244a74d 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -215,13 +215,6 @@
#include "libbb.h"
#include "inet_common.h"
-
-/*
- * Definitions for internet protocol version 4.
- * Per RFC 791, September 1981.
- */
-#define IPVERSION 4
-
#ifndef IPPROTO_ICMP
# define IPPROTO_ICMP 1
#endif
@@ -229,122 +222,57 @@
# define IPPROTO_IP 0
#endif
-/*
- * Overlay for ip header used by other protocols (tcp, udp).
- */
-struct ipovly {
- unsigned char ih_x1[9]; /* (unused) */
- unsigned char ih_pr; /* protocol */
- short ih_len; /* protocol length */
- struct in_addr ih_src; /* source internet address */
- struct in_addr ih_dst; /* destination internet address */
+/* Keep in sync with getopt32 call! */
+enum {
+ OPT_DONT_FRAGMNT = (1 << 0), /* F */
+ OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */
+ OPT_TTL_FLAG = (1 << 2), /* l */
+ OPT_ADDR_NUM = (1 << 3), /* n */
+ OPT_BYPASS_ROUTE = (1 << 4), /* r */
+ OPT_DEBUG = (1 << 5), /* d */
+ OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */
+ OPT_IP_CHKSUM = (1 << 7), /* x */
+ OPT_TOS = (1 << 8), /* t */
+ OPT_DEVICE = (1 << 9), /* i */
+ OPT_MAX_TTL = (1 << 10), /* m */
+ OPT_PORT = (1 << 11), /* p */
+ OPT_NPROBES = (1 << 12), /* q */
+ OPT_SOURCE = (1 << 13), /* s */
+ OPT_WAITTIME = (1 << 14), /* w */
+ OPT_PAUSE_MS = (1 << 15), /* z */
+ OPT_FIRST_TTL = (1 << 16), /* f */
};
+#define verbose (option_mask32 & OPT_VERBOSE)
-/*
- * UDP kernel structures and variables.
- */
-struct udpiphdr {
- struct ipovly ui_i; /* overlaid ip structure */
- struct udphdr ui_u; /* udp header */
-};
-#define ui_next ui_i.ih_next
-#define ui_prev ui_i.ih_prev
-#define ui_x1 ui_i.ih_x1
-#define ui_pr ui_i.ih_pr
-#define ui_len ui_i.ih_len
-#define ui_src ui_i.ih_src
-#define ui_dst ui_i.ih_dst
-#define ui_sport ui_u.uh_sport
-#define ui_dport ui_u.uh_dport
-#define ui_ulen ui_u.uh_ulen
-#define ui_sum ui_u.uh_sum
-
-
-/* Host name and address list */
-struct hostinfo {
- char *name;
- int n;
- uint32_t *addrs;
+enum {
+ SIZEOF_ICMP_HDR = 8,
+ rcvsock = 3, /* receive (icmp) socket file descriptor */
+ sndsock = 4, /* send (udp/icmp) socket file descriptor */
};
/* Data section of the probe packet */
-typedef struct outdata {
+struct outdata_t {
unsigned char seq; /* sequence number of this packet */
unsigned char ttl; /* ttl packet left with */
// UNUSED. Retaining to have the same packet size.
struct timeval tv_UNUSED PACKED; /* time packet left */
-} outdata_t;
-
-struct IFADDRLIST {
- uint32_t addr;
- char device[sizeof(struct ifreq)];
};
-
-/* Keep in sync with getopt32 call! */
-#define OPT_DONT_FRAGMNT (1<<0) /* F */
-#define OPT_USE_ICMP (1<<1) /* I */
-#define OPT_TTL_FLAG (1<<2) /* l */
-#define OPT_ADDR_NUM (1<<3) /* n */
-#define OPT_BYPASS_ROUTE (1<<4) /* r */
-#define OPT_DEBUG (1<<5) /* d */
-#define OPT_VERBOSE (1<<6) /* v */
-#define OPT_IP_CHKSUM (1<<7) /* x */
-#define OPT_TOS (1<<8) /* t */
-#define OPT_DEVICE (1<<9) /* i */
-#define OPT_MAX_TTL (1<<10) /* m */
-#define OPT_PORT (1<<11) /* p */
-#define OPT_NPROBES (1<<12) /* q */
-#define OPT_SOURCE (1<<13) /* s */
-#define OPT_WAITTIME (1<<14) /* w */
-#define OPT_PAUSE_MS (1<<15) /* z */
-#define OPT_FIRST_TTL (1<<16) /* f */
-
-#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
-/* use icmp echo instead of udp packets */
-#define useicmp (option_mask32 & OPT_USE_ICMP)
-#endif
-#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
-#define verbose (option_mask32 & OPT_VERBOSE)
-#endif
-#define nflag (option_mask32 & OPT_ADDR_NUM)
-
-
struct globals {
- struct ip *outip; /* last output (udp) packet */
- struct udphdr *outudp; /* last output (udp) packet */
- struct outdata *outdata; /* last output (udp) packet */
-
-#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
- struct icmp *outicmp; /* last output (icmp) packet */
-#endif
-
- int rcvsock; /* receive (icmp) socket file descriptor */
- int sndsock; /* send (udp/icmp) socket file descriptor */
-
+ struct ip *outip;
+ struct outdata_t *outdata;
+ len_and_sockaddr *dest_lsa;
int packlen; /* total length of packet */
- int minpacket; /* min ip packet size */
- int maxpacket; // 32 * 1024; /* max ip packet size */
int pmtu; /* Path MTU Discovery (RFC1191) */
-
- char *hostname;
-
uint16_t ident;
uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */
-
int waittime; // 5; /* time to wait for response (in seconds) */
- int doipcksum; // 1; /* calculate ip checksums by default */
-
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
int optlen; /* length of ip options */
#else
#define optlen 0
#endif
-
- struct sockaddr_storage whereto; /* Who to try to reach */
- struct sockaddr_storage wherefrom; /* Who we are */
- /* last inbound (icmp) packet */
- unsigned char packet[512];
+ unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
/* Maximum number of gateways (include room for one noop) */
#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t)))
@@ -355,206 +283,39 @@ struct globals {
#define G (*ptr_to_globals)
#define outip (G.outip )
-#define outudp (G.outudp )
#define outdata (G.outdata )
-#define outicmp (G.outicmp )
-#define rcvsock (G.rcvsock )
-#define sndsock (G.sndsock )
+#define dest_lsa (G.dest_lsa )
#define packlen (G.packlen )
-#define minpacket (G.minpacket)
-#define maxpacket (G.maxpacket)
#define pmtu (G.pmtu )
-#define hostname (G.hostname )
#define ident (G.ident )
#define port (G.port )
#define waittime (G.waittime )
-#define doipcksum (G.doipcksum)
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
-#define optlen (G.optlen )
+# define optlen (G.optlen )
#endif
-#define packet (G.packet )
-#define whereto (G.whereto )
-#define wherefrom (G.wherefrom)
+#define recv_pkt (G.recv_pkt )
#define gwlist (G.gwlist )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
- maxpacket = 32 * 1024; \
port = 32768 + 666; \
waittime = 5; \
- doipcksum = 1; \
} while (0)
+#define outicmp ((struct icmp *)(outip + 1))
+#define outudp ((struct udphdr *)(outip + 1))
-/*
- * Return the interface list
- */
-static int
-ifaddrlist(struct IFADDRLIST **ipaddrp)
-{
- enum { IFREQ_BUFSIZE = (32 * 1024) / sizeof(struct ifreq) };
-
- int fd, nipaddr;
-#ifdef HAVE_SOCKADDR_SA_LEN
- int n;
-#endif
- struct ifreq *ifrp, *ifend, *ifnext;
- struct sockaddr_in *addr_sin;
- struct IFADDRLIST *al;
- struct ifconf ifc;
- struct ifreq ifr;
- /* Was on stack, but 32k is a bit too much: */
- struct ifreq *ibuf = xmalloc(IFREQ_BUFSIZE * sizeof(ibuf[0]));
- struct IFADDRLIST *st_ifaddrlist;
-
- fd = xsocket(AF_INET, SOCK_DGRAM, 0);
-
- ifc.ifc_len = IFREQ_BUFSIZE * sizeof(ibuf[0]);
- ifc.ifc_buf = (caddr_t)ibuf;
-
- if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0
- || ifc.ifc_len < (int)sizeof(struct ifreq)
- ) {
- if (errno == EINVAL)
- bb_error_msg_and_die(
- "SIOCGIFCONF: ifreq struct too small (%u bytes)",
- (unsigned)(IFREQ_BUFSIZE * sizeof(ibuf[0])));
- bb_perror_msg_and_die("SIOCGIFCONF");
- }
- ifrp = ibuf;
- ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
-
- nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq));
- st_ifaddrlist = xzalloc(nipaddr * sizeof(struct IFADDRLIST));
- al = st_ifaddrlist;
- nipaddr = 0;
-
- for (; ifrp < ifend; ifrp = ifnext) {
-#ifdef HAVE_SOCKADDR_SA_LEN
- n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
- if (n < sizeof(*ifrp))
- ifnext = ifrp + 1;
- else
- ifnext = (struct ifreq *)((char *)ifrp + n);
- if (ifrp->ifr_addr.sa_family != AF_INET)
- continue;
-#else
- ifnext = ifrp + 1;
-#endif
- /*
- * Need a template to preserve address info that is
- * used below to locate the next entry. (Otherwise,
- * SIOCGIFFLAGS stomps over it because the requests
- * are returned in a union.)
- */
- strncpy_IFNAMSIZ(ifr.ifr_name, ifrp->ifr_name);
- if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
- if (errno == ENXIO)
- continue;
- bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s",
- (int)sizeof(ifr.ifr_name), ifr.ifr_name);
- }
-
- /* Must be up */
- if ((ifr.ifr_flags & IFF_UP) == 0)
- continue;
-
- safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1);
-#ifdef sun
- /* Ignore sun virtual interfaces */
- if (strchr(al->device, ':') != NULL)
- continue;
-#endif
- ioctl_or_perror_and_die(fd, SIOCGIFADDR, (char *)&ifr,
- "SIOCGIFADDR: %s", al->device);
-
- addr_sin = (struct sockaddr_in *)&ifr.ifr_addr;
- al->addr = addr_sin->sin_addr.s_addr;
- ++al;
- ++nipaddr;
- }
- if (nipaddr == 0)
- bb_error_msg_and_die("can't find any network interfaces");
-
- free(ibuf);
- close(fd);
- *ipaddrp = st_ifaddrlist;
- return nipaddr;
-}
-
-static void
-setsin(struct sockaddr_in *addr_sin, uint32_t addr)
-{
- memset(addr_sin, 0, sizeof(*addr_sin));
-#ifdef HAVE_SOCKADDR_SA_LEN
- addr_sin->sin_len = sizeof(*addr_sin);
-#endif
- addr_sin->sin_family = AF_INET;
- addr_sin->sin_addr.s_addr = addr;
-}
-
-/*
- * Return the source address for the given destination address
- */
-static void
-findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from)
-{
- int i, n;
- FILE *f;
- uint32_t mask;
- uint32_t dest, tmask;
- struct IFADDRLIST *al;
- char buf[256], tdevice[256], device[256];
-
- f = xfopen_for_read("/proc/net/route");
-
- /* Find the appropriate interface */
- n = 0;
- mask = 0;
- device[0] = '\0';
- while (fgets(buf, sizeof(buf), f) != NULL) {
- ++n;
- if (n == 1 && strncmp(buf, "Iface", 5) == 0)
- continue;
- i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x",
- tdevice, &dest, &tmask);
- if (i != 3)
- bb_error_msg_and_die("junk in buffer");
- if ((to->sin_addr.s_addr & tmask) == dest
- && (tmask > mask || mask == 0)
- ) {
- mask = tmask;
- strcpy(device, tdevice);
- }
- }
- fclose(f);
-
- if (device[0] == '\0')
- bb_error_msg_and_die("can't find interface");
-
- /* Get the interface address list */
- n = ifaddrlist(&al);
-
- /* Find our appropriate source address */
- for (i = n; i > 0; --i, ++al)
- if (strcmp(device, al->device) == 0)
- break;
- if (i <= 0)
- bb_error_msg_and_die("can't find interface %s", device);
-
- setsin(from, al->addr);
-}
static int
-wait_for_reply(int sock, struct sockaddr_in *fromp)
+wait_for_reply(struct sockaddr_in *fromp)
{
struct pollfd pfd[1];
int cc = 0;
socklen_t fromlen = sizeof(*fromp);
- pfd[0].fd = sock;
+ pfd[0].fd = rcvsock;
pfd[0].events = POLLIN;
if (safe_poll(pfd, 1, waittime * 1000) > 0)
- cc = recvfrom(sock, packet, sizeof(packet), 0,
+ cc = recvfrom(rcvsock, recv_pkt, sizeof(recv_pkt), 0,
(struct sockaddr *)fromp, &fromlen);
return cc;
}
@@ -595,22 +356,8 @@ in_cksum(uint16_t *addr, int len)
static void
send_probe(int seq, int ttl)
{
- int cc;
- struct udpiphdr *ui, *oui;
- struct ip tip;
-
- outip->ip_ttl = ttl;
- outip->ip_id = htons(ident + seq);
-
- /*
- * In most cases, the kernel will recalculate the ip checksum.
- * But we must do it anyway so that the udp checksum comes out right.
- */
- if (doipcksum) {
- outip->ip_sum = in_cksum((uint16_t *)outip, sizeof(*outip) + optlen);
- if (outip->ip_sum == 0)
- outip->ip_sum = 0xffff;
- }
+ int len, res;
+ void *out;
/* Payload */
outdata->seq = seq;
@@ -618,39 +365,15 @@ send_probe(int seq, int ttl)
// UNUSED: was storing gettimeofday's result there, but never ever checked it
/*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
-#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
- if (useicmp)
+ if (option_mask32 & OPT_USE_ICMP) {
outicmp->icmp_seq = htons(seq);
- else
-#endif
- outudp->dest = htons(port + seq);
-#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
- if (useicmp) {
/* Always calculate checksum for icmp packets */
outicmp->icmp_cksum = 0;
outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
packlen - (sizeof(*outip) + optlen));
if (outicmp->icmp_cksum == 0)
outicmp->icmp_cksum = 0xffff;
- } else
-#endif
- if (doipcksum) {
- /* Checksum (we must save and restore ip header) */
- tip = *outip;
- ui = (struct udpiphdr *)outip;
- oui = (struct udpiphdr *)&tip;
- /* Easier to zero and put back things that are ok */
- memset(ui, 0, sizeof(ui->ui_i));
- ui->ui_src = oui->ui_src;
- ui->ui_dst = oui->ui_dst;
- ui->ui_pr = oui->ui_pr;
- ui->ui_len = outudp->len;
- outudp->check = 0;
- outudp->check = in_cksum((uint16_t *)ui, packlen);
- if (outudp->check == 0)
- outudp->check = 0xffff;
- *outip = tip;
}
//BUG! verbose is (x & OPT_VERBOSE), not a counter!
@@ -679,17 +402,25 @@ send_probe(int seq, int ttl)
}
#endif
-#if !defined(IP_HDRINCL) && defined(IP_TTL)
+#if defined(IP_TTL)
if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
(char *)&ttl, sizeof(ttl)) < 0) {
bb_perror_msg_and_die("setsockopt ttl %d", ttl);
}
#endif
- cc = xsendto(sndsock, outip, packlen,
- (struct sockaddr *)&whereto, sizeof(whereto));
- if (cc != packlen) {
- bb_info_msg("sent %s %d octets, ret=%d", hostname, packlen, cc);
+ len = packlen - sizeof(*outip);
+ if (option_mask32 & OPT_USE_ICMP)
+ out = outicmp;
+ else {
+ out = outdata;
+ len -= sizeof(*outudp);
+ set_nport(dest_lsa, htons(port + seq));
+ }
+ res = xsendto(sndsock, out, len,
+ (struct sockaddr *)&dest_lsa->u.sa, dest_lsa->len);
+ if (res != len) {
+ bb_info_msg("sent %d octets, ret=%d", len, res);
}
}
@@ -716,18 +447,18 @@ pr_type(unsigned char t)
#endif
#if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
-#define packet_ok(buf, cc, from, seq) \
- packet_ok(buf, cc, seq)
+#define packet_ok(cc, from, seq) \
+ packet_ok(cc, seq)
#endif
static int
-packet_ok(const unsigned char *buf, int cc, const struct sockaddr_in *from, int seq)
+packet_ok(int cc, const struct sockaddr_in *from, int seq)
{
const struct icmp *icp;
unsigned char type, code;
int hlen;
const struct ip *ip;
- ip = (struct ip *) buf;
+ ip = (struct ip *) recv_pkt;
hlen = ip->ip_hl << 2;
if (cc < hlen + ICMP_MINLEN) {
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
@@ -738,7 +469,7 @@ packet_ok(const unsigned char *buf, int cc, const struct sockaddr_in *from, int
return 0;
}
cc -= hlen;
- icp = (struct icmp *)(buf + hlen);
+ icp = (struct icmp *)(recv_pkt + hlen);
type = icp->icmp_type;
code = icp->icmp_code;
/* Path MTU Discovery (RFC1191) */
@@ -755,33 +486,37 @@ packet_ok(const unsigned char *buf, int cc, const struct sockaddr_in *from, int
hip = &icp->icmp_ip;
hlen = hip->ip_hl << 2;
-#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
- if (useicmp) {
+ if (option_mask32 & OPT_USE_ICMP) {
struct icmp *hicmp;
/* XXX */
- if (type == ICMP_ECHOREPLY &&
- icp->icmp_id == htons(ident) &&
- icp->icmp_seq == htons(seq))
+ if (type == ICMP_ECHOREPLY
+ && icp->icmp_id == htons(ident)
+ && icp->icmp_seq == htons(seq)
+ ) {
return -2;
+ }
hicmp = (struct icmp *)((unsigned char *)hip + hlen);
- /* XXX 8 is a magic number */
- if (hlen + 8 <= cc &&
- hip->ip_p == IPPROTO_ICMP &&
- hicmp->icmp_id == htons(ident) &&
- hicmp->icmp_seq == htons(seq))
+ if (hlen + SIZEOF_ICMP_HDR <= cc
+ && hip->ip_p == IPPROTO_ICMP
+ && hicmp->icmp_id == htons(ident)
+ && hicmp->icmp_seq == htons(seq)
+ ) {
return (type == ICMP_TIMXCEED ? -1 : code + 1);
- } else
-#endif
- {
- up = (struct udphdr *)((unsigned char *)hip + hlen);
- /* XXX 8 is a magic number */
- if (hlen + 12 <= cc &&
- hip->ip_p == IPPROTO_UDP &&
- up->source == htons(ident) &&
- up->dest == htons(port + seq))
+ }
+ } else {
+ up = (struct udphdr *)((char *)hip + hlen);
+ if (hlen + 12 <= cc
+ && hip->ip_p == IPPROTO_UDP
+// Off: since we do not form the entire IP packet,
+// but defer it to kernel, we can't set source port,
+// and thus can't check it here in the reply
+ /* && up->source == htons(ident) */
+ && up->dest == htons(port + seq)
+ ) {
return (type == ICMP_TIMXCEED ? -1 : code + 1);
+ }
}
}
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
@@ -812,85 +547,31 @@ print_inetname(const struct sockaddr_in *from)
const char *ina;
ina = inet_ntoa(from->sin_addr);
- if (nflag)
- printf(" %s", ina);
+ if (option_mask32 & OPT_ADDR_NUM)
+ printf(" %s", ina);
else {
char *n = NULL;
if (from->sin_addr.s_addr != INADDR_ANY)
n = xmalloc_sockaddr2host_noport((struct sockaddr*)from);
- printf(" %s (%s)", (n ? n : ina), ina);
+ printf(" %s (%s)", (n ? n : ina), ina);
free(n);
}
}
static void
-print(const unsigned char *buf, int cc, const struct sockaddr_in *from)
+print(int cc, const struct sockaddr_in *from)
{
- const struct ip *ip;
- int hlen;
-
- ip = (struct ip *) buf;
- hlen = ip->ip_hl << 2;
- cc -= hlen;
-
print_inetname(from);
-#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
- if (verbose)
- printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst));
-#endif
-}
+ if (verbose) {
+ const struct ip *ip;
+ int hlen;
-static struct hostinfo *
-gethostinfo(const char *host)
-{
- int n;
- struct hostent *hp;
- struct hostinfo *hi;
- char **p;
- uint32_t addr, *ap;
-
- hi = xzalloc(sizeof(*hi));
- addr = inet_addr(host);
- if (addr != 0xffffffff) {
- hi->name = xstrdup(host);
- hi->n = 1;
- hi->addrs = xzalloc(sizeof(hi->addrs[0]));
- hi->addrs[0] = addr;
- return hi;
+ ip = (struct ip *) recv_pkt;
+ hlen = ip->ip_hl << 2;
+ cc -= hlen;
+ printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst));
}
-
- hp = xgethostbyname(host);
- if (hp->h_addrtype != AF_INET || hp->h_length != 4)
- bb_perror_msg_and_die("bad host %s", host);
- hi->name = xstrdup(hp->h_name);
- for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p)
- continue;
- hi->n = n;
- hi->addrs = xzalloc(n * sizeof(hi->addrs[0]));
- for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p)
- memcpy(ap, *p, sizeof(*ap));
- return hi;
-}
-
-static void
-freehostinfo(struct hostinfo *hi)
-{
- free(hi->name);
- free(hi->addrs);
- free(hi);
-}
-
-#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
-static void
-getaddr(uint32_t *ap, const char *host)
-{
- struct hostinfo *hi;
-
- hi = gethostinfo(host);
- *ap = hi->addrs[0];
- freehostinfo(hi);
}
-#endif
static void
print_delta_ms(unsigned t1p, unsigned t2p)
@@ -900,46 +581,38 @@ print_delta_ms(unsigned t1p, unsigned t2p)
}
/*
-"Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n"
-"\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n"
-"\t[-w waittime] [-z pausemsecs] host [packetlen]"
+Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]
+[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]
+[-w waittime] [-z pausemsecs] host [packetlen]"
*/
int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int traceroute_main(int argc, char **argv)
{
- unsigned char *outp;
- struct sockaddr_in *from;
- struct sockaddr_in *to;
- struct hostinfo *hi;
- int ttl, probe, i;
+ int minpacket;
+ int ttl, i;
int seq = 0;
int tos = 0;
- char *tos_str;
- char *source;
+ int max_ttl = 30;
+ int nprobes = 3;
+ int first_ttl = 1;
+ unsigned pausemsecs = 0;
unsigned op;
-#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
- int lsrr = 0;
-#endif
- struct IFADDRLIST *al;
+ char *source;
char *device;
- int max_ttl = 30;
+ char *tos_str;
char *max_ttl_str;
char *port_str;
- int nprobes = 3;
char *nprobes_str;
char *waittime_str;
- unsigned pausemsecs = 0;
char *pausemsecs_str;
- int first_ttl = 1;
char *first_ttl_str;
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
llist_t *source_route_list = NULL;
+ int lsrr = 0;
#endif
INIT_G();
- from = (struct sockaddr_in *)&wherefrom;
- to = (struct sockaddr_in *)&whereto;
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
opt_complementary = "x-x:g::";
@@ -958,10 +631,10 @@ int traceroute_main(int argc, char **argv)
#endif
);
- if (op & OPT_IP_CHKSUM) {
- doipcksum = 0;
+#if 0 /* IGNORED */
+ if (op & OPT_IP_CHKSUM)
bb_error_msg("warning: ip checksums disabled");
- }
+#endif
if (op & OPT_TOS)
tos = xatou_range(tos_str, 0, 255);
if (op & OPT_MAX_TTL)
@@ -988,42 +661,33 @@ int traceroute_main(int argc, char **argv)
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
if (source_route_list) {
while (source_route_list) {
+ len_and_sockaddr *lsa;
+
if (lsrr >= NGATEWAYS)
bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
- getaddr(gwlist + lsrr, llist_pop(&source_route_list));
+ lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET);
+ gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr;
+ free(lsa);
++lsrr;
}
optlen = (lsrr + 1) * sizeof(gwlist[0]);
}
#endif
- minpacket = sizeof(*outip) + sizeof(*outdata) + optlen;
-
-#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
- if (useicmp)
- minpacket += 8; /* XXX magic number */
- else
-#endif
- minpacket += sizeof(*outudp);
- packlen = minpacket; /* minimum sized packet */
+ minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen;
+ if (!(op & OPT_USE_ICMP))
+ minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR;
+ packlen = minpacket;
/* Process destination and optional packet size */
argv += optind;
argc -= optind;
switch (argc) {
case 2:
- packlen = xatoul_range(argv[1], minpacket, maxpacket);
+ packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
/* Fall through */
case 1:
- hostname = argv[0];
- hi = gethostinfo(hostname);
- setsin(to, hi->addrs[0]);
- if (hi->n > 1)
- bb_error_msg("warning: %s has multiple addresses; using %s",
- hostname, inet_ntoa(to->sin_addr));
- hostname = hi->name;
- hi->name = NULL;
- freehostinfo(hi);
+ dest_lsa = xhost2sockaddr(argv[0], port);
break;
default:
bb_show_usage();
@@ -1032,8 +696,7 @@ int traceroute_main(int argc, char **argv)
/* Ensure the socket fds won't be 0, 1 or 2 */
bb_sanitize_stdio();
- rcvsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
-
+ xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock);
#if TRACEROUTE_SO_DEBUG
if (op & OPT_DEBUG)
setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
@@ -1043,15 +706,17 @@ int traceroute_main(int argc, char **argv)
setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
&const_int_1, sizeof(const_int_1));
- sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
-
+ if (op & OPT_USE_ICMP)
+ xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock);
+ else
+ xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock);
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
#if defined(IP_OPTIONS)
if (lsrr > 0) {
unsigned char optlist[MAX_IPOPTLEN];
/* final hop */
- gwlist[lsrr] = to->sin_addr.s_addr;
+ gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr;
++lsrr;
/* force 4 byte alignment */
@@ -1071,24 +736,20 @@ int traceroute_main(int argc, char **argv)
}
#endif /* IP_OPTIONS */
#endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */
-
#ifdef SO_SNDBUF
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) {
bb_perror_msg_and_die("SO_SNDBUF");
}
#endif
-#ifdef IP_HDRINCL
- if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, &const_int_1, sizeof(const_int_1)) < 0
- && errno != ENOPROTOOPT
- ) {
- bb_perror_msg_and_die("IP_HDRINCL");
- }
-#else
#ifdef IP_TOS
if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
bb_perror_msg_and_die("setsockopt tos %d", tos);
}
#endif
+#ifdef IP_DONTFRAG
+ if (op & OPT_DONT_FRAGMNT)
+ setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG,
+ &const_int_1, sizeof(const_int_1));
#endif
#if TRACEROUTE_SO_DEBUG
if (op & OPT_DEBUG)
@@ -1099,136 +760,82 @@ int traceroute_main(int argc, char **argv)
setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
&const_int_1, sizeof(const_int_1));
- /* Revert to non-privileged user after opening sockets */
- xsetgid(getgid());
- xsetuid(getuid());
-
outip = xzalloc(packlen);
- outip->ip_v = IPVERSION;
- if (op & OPT_TOS)
- outip->ip_tos = tos;
- outip->ip_len = htons(packlen);
- if (op & OPT_DONT_FRAGMNT)
- outip->ip_off = htons(IP_DF);
- outp = (unsigned char *)(outip + 1);
- outip->ip_dst = to->sin_addr;
-
- outip->ip_hl = (outp - (unsigned char *)outip) >> 2;
- ident = (getpid() & 0xffff) | 0x8000;
-#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
- if (useicmp) {
- outip->ip_p = IPPROTO_ICMP;
- outicmp = (struct icmp *)outp;
+ if (op & OPT_USE_ICMP) {
+ ident = getpid() | 0x8000;
outicmp->icmp_type = ICMP_ECHO;
outicmp->icmp_id = htons(ident);
- outdata = (outdata_t *)(outp + 8); /* XXX magic number */
- } else
-#endif
- {
- outip->ip_p = IPPROTO_UDP;
- outudp = (struct udphdr *)outp;
- outudp->source = htons(ident);
- outudp->len = htons((uint16_t)(packlen - (sizeof(*outip) + optlen)));
- outdata = (outdata_t *)(outudp + 1);
+ outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR);
+ } else {
+ outdata = (struct outdata_t *)(outudp + 1);
}
- /* Look for a specific device */
- if (op & OPT_DEVICE) {
- /* Get the interface address list */
- int n = ifaddrlist(&al);
- for (; n > 0; --n, ++al)
- if (strcmp(device, al->device) == 0)
- goto found_dev;
- bb_error_msg_and_die("can't find interface %s", device);
- }
- found_dev:
+ if (op & OPT_DEVICE) /* hmm, do we need error check? */
+ setsockopt_bindtodevice(sndsock, device);
- /* Determine our source address */
- if (!(op & OPT_SOURCE)) {
- /*
- * If a device was specified, use the interface address.
- * Otherwise, try to determine our source address.
- */
- if (op & OPT_DEVICE)
- setsin(from, al->addr);
- findsaddr(to, from);
- } else {
- hi = gethostinfo(source);
- source = hi->name;
- hi->name = NULL;
- /*
- * If the device was specified make sure it
- * corresponds to the source address specified.
- * Otherwise, use the first address (and warn if
- * there are more than one).
- */
- if (op & OPT_DEVICE) {
- uint32_t *ap;
- for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap)
- if (*ap == al->addr)
- goto found_dev2;
- bb_error_msg_and_die("%s is not on interface %s",
- source, device);
- found_dev2:
- setsin(from, *ap);
- } else {
- setsin(from, hi->addrs[0]);
- if (hi->n > 1)
- bb_error_msg(
- "warning: %s has multiple addresses; using %s",
- source, inet_ntoa(from->sin_addr));
- }
- freehostinfo(hi);
+ if (op & OPT_SOURCE) {
+ len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0);
+ /* Ping does this (why?) */
+ if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF,
+ &source_lsa->u.sa, source_lsa->len))
+ bb_error_msg_and_die("can't set multicast source interface");
+//TODO: we can query source port we bound to,
+// and check it in replies... if we care enough
+ xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
+ free(source_lsa);
}
- outip->ip_src = from->sin_addr;
-#ifndef IP_HDRINCL
- xbind(sndsock, (struct sockaddr *)from, sizeof(*from));
-#endif
+ /* Revert to non-privileged user after opening sockets */
+ xsetgid(getgid());
+ xsetuid(getuid());
- printf("traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr));
+ printf("traceroute to %s (%s)", argv[0],
+ xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa));
if (op & OPT_SOURCE)
printf(" from %s", source);
printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
+//TODO: make it protocol agnostic (get rid of sockaddr_in)
+ struct sockaddr_in from;
uint32_t lastaddr = 0;
- int gotlastaddr = 0;
+ int probe;
+ int unreachable = 0; /* counter */
+ int gotlastaddr = 0; /* flags */
int got_there = 0;
- int unreachable = 0;
- int sentfirst = 0;
+ int first = 1;
- printf("%2d ", ttl);
+ printf("%2d", ttl);
for (probe = 0; probe < nprobes; ++probe) {
int cc;
unsigned t1;
unsigned t2;
struct ip *ip;
- if (sentfirst && pausemsecs > 0)
+ if (!first && pausemsecs > 0)
usleep(pausemsecs * 1000);
fflush(stdout);
t1 = monotonic_us();
send_probe(++seq, ttl);
- ++sentfirst;
+ first = 0;
- while ((cc = wait_for_reply(rcvsock, from)) != 0) {
+ while ((cc = wait_for_reply(&from)) != 0) {
t2 = monotonic_us();
- i = packet_ok(packet, cc, from, seq);
+ i = packet_ok(cc, &from, seq);
/* Skip short packet */
if (i == 0)
continue;
if (!gotlastaddr
- || from->sin_addr.s_addr != lastaddr
+ || from.sin_addr.s_addr != lastaddr
) {
- print(packet, cc, from);
- lastaddr = from->sin_addr.s_addr;
- ++gotlastaddr;
+ print(cc, &from);
+ lastaddr = from.sin_addr.s_addr;
+ gotlastaddr = 1;
}
print_delta_ms(t1, t2);
- ip = (struct ip *)packet;
+ ip = (struct ip *)recv_pkt;
if (op & OPT_TTL_FLAG)
printf(" (%d)", ip->ip_ttl);
if (i == -2) {
generated by cgit v1.1 at 2024-11-09 02:15:02 +0000