diff options
Diffstat (limited to 'main/busybox/0006-ping-make-ping-work-without-root-privileges.patch')
| -rw-r--r-- | main/busybox/0006-ping-make-ping-work-without-root-privileges.patch | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/main/busybox/0006-ping-make-ping-work-without-root-privileges.patch b/main/busybox/0006-ping-make-ping-work-without-root-privileges.patch new file mode 100644 index 0000000000..630619b4a8 --- /dev/null +++ b/main/busybox/0006-ping-make-ping-work-without-root-privileges.patch @@ -0,0 +1,197 @@ +From 21d74f2989d0046e5b7c586f5a052643d5da8dcc Mon Sep 17 00:00:00 2001 +From: Natanael Copa <ncopa@alpinelinux.org> +Date: Tue, 29 Mar 2016 18:59:22 +0200 +Subject: [PATCH 06/16] ping: make ping work without root privileges + +--- + networking/ping.c | 103 +++++++++++++++++++++++++++++++++++++++++++++--------- + 1 file changed, 87 insertions(+), 16 deletions(-) + +diff --git a/networking/ping.c b/networking/ping.c +index d1d59d545..c0ebc0f9a 100644 +--- a/networking/ping.c ++++ b/networking/ping.c +@@ -163,6 +163,7 @@ enum { + pingsock = 0, + }; + ++static int using_dgram; + static void + #if ENABLE_PING6 + create_icmp_socket(len_and_sockaddr *lsa) +@@ -179,9 +180,23 @@ create_icmp_socket(void) + #endif + sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */ + if (sock < 0) { +- if (errno == EPERM) +- bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); +- bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket); ++ if (errno != EPERM) ++ bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket); ++#if defined(__linux__) || defined(__APPLE__) ++ /* We don't have root privileges. Try SOCK_DGRAM instead. ++ * Linux needs net.ipv4.ping_group_range for this to work. ++ * MacOSX allows ICMP_ECHO, ICMP_TSTAMP or ICMP_MASKREQ ++ */ ++#if ENABLE_PING6 ++ if (lsa->u.sa.sa_family == AF_INET6) ++ sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6); ++ else ++#endif ++ sock = socket(AF_INET, SOCK_DGRAM, 1); /* 1 == ICMP */ ++ if (sock < 0) ++#endif ++ bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); ++ using_dgram = 1; + } + + xmove_fd(sock, pingsock); +@@ -234,10 +249,12 @@ static void ping4(len_and_sockaddr *lsa) + bb_perror_msg("recvfrom"); + continue; + } +- if (c >= 76) { /* ip + icmp */ +- struct iphdr *iphdr = (struct iphdr *) G.packet; ++ if (c >= 76 || using_dgram && (c == 64)) { /* ip + icmp */ ++ if(!using_dgram) { ++ struct iphdr *iphdr = (struct iphdr *) G.packet; + +- pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2)); /* skip ip hdr */ ++ pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2)); /* skip ip hdr */ ++ } else pkt = (struct icmp *) G.packet; + if (pkt->icmp_id != G.myid) + continue; /* not our ping */ + if (pkt->icmp_type == ICMP_ECHOREPLY) +@@ -634,19 +651,21 @@ static void unpack_tail(int sz, uint32_t *tp, + } + static void unpack4(char *buf, int sz, struct sockaddr_in *from) + { +- struct icmp *icmppkt; + struct iphdr *iphdr; ++ struct icmp *icmppkt; + int hlen; + + /* discard if too short */ + if (sz < (datalen + ICMP_MINLEN)) + return; ++ if(!using_dgram) { ++ /* check IP header */ ++ iphdr = (struct iphdr *) buf; ++ hlen = iphdr->ihl << 2; ++ sz -= hlen; ++ icmppkt = (struct icmp *) (buf + hlen); ++ } else icmppkt = (struct icmp *) buf; + +- /* check IP header */ +- iphdr = (struct iphdr *) buf; +- hlen = iphdr->ihl << 2; +- sz -= hlen; +- icmppkt = (struct icmp *) (buf + hlen); + if (icmppkt->icmp_id != myid) + return; /* not our ping */ + +@@ -658,7 +677,7 @@ static void unpack4(char *buf, int sz, struct sockaddr_in *from) + tp = (uint32_t *) icmppkt->icmp_data; + unpack_tail(sz, tp, + inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr), +- recv_seq, iphdr->ttl); ++ recv_seq, using_dgram ? 42 : iphdr->ttl); + } else if (icmppkt->icmp_type != ICMP_ECHO) { + bb_error_msg("warning: got ICMP %d (%s)", + icmppkt->icmp_type, +@@ -702,11 +721,31 @@ static void ping4(len_and_sockaddr *lsa) + int sockopt; + + pingaddr.sin = lsa->u.sin; +- if (source_lsa) { ++ if (source_lsa && !using_dgram) { + if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF, + &source_lsa->u.sa, source_lsa->len)) + bb_error_msg_and_die("can't set multicast source interface"); + xbind(pingsock, &source_lsa->u.sa, source_lsa->len); ++ } else if(using_dgram) { ++ struct sockaddr_in sa; ++ socklen_t sl; ++ ++ sa.sin_family = AF_INET; ++ sa.sin_port = 0; ++ sa.sin_addr.s_addr = source_lsa ? ++ source_lsa->u.sin.sin_addr.s_addr : 0; ++ sl = sizeof(sa); ++ ++ if (bind(pingsock, (struct sockaddr *) &sa, sl) == -1) { ++ perror("bind"); ++ exit(2); ++ } ++ ++ if (getsockname(pingsock, (struct sockaddr *) &sa, &sl) == -1) { ++ perror("getsockname"); ++ exit(2); ++ } ++ myid = sa.sin_port; + } + + /* enable broadcast pings */ +@@ -723,6 +762,15 @@ static void ping4(len_and_sockaddr *lsa) + setsockopt_int(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, opt_ttl); + } + ++ if(using_dgram) { ++ int hold = 65536; ++ if (setsockopt(pingsock, SOL_IP, IP_RECVTTL, (char *)&hold, sizeof(hold))) ++ perror("WARNING: setsockopt(IP_RECVTTL)"); ++ if (setsockopt(pingsock, SOL_IP, IP_RETOPTS, (char *)&hold, sizeof(hold))) ++ perror("WARNING: setsockopt(IP_RETOPTS)"); ++ ++ } ++ + signal(SIGINT, print_stats_and_exit); + + /* start the ping's going ... */ +@@ -756,10 +804,33 @@ static void ping6(len_and_sockaddr *lsa) + char control_buf[CMSG_SPACE(36)]; + + pingaddr.sin6 = lsa->u.sin6; +- if (source_lsa) ++ if (source_lsa && !using_dgram) + xbind(pingsock, &source_lsa->u.sa, source_lsa->len); ++ else if(using_dgram) { ++ struct sockaddr_in6 sa = {0}; ++ socklen_t sl; ++ ++ sa.sin6_family = AF_INET6; ++ sa.sin6_port = 0; ++ if(source_lsa) { ++ memcpy(&sa.sin6_addr, &source_lsa->u.sin6.sin6_addr, sizeof(struct in6_addr)); ++ } ++ sl = sizeof(sa); ++ ++ if (bind(pingsock, (struct sockaddr *) &sa, sl) == -1) { ++ perror("bind"); ++ exit(2); ++ } ++ ++ if (getsockname(pingsock, (struct sockaddr *) &sa, &sl) == -1) { ++ perror("getsockname"); ++ exit(2); ++ } ++ myid = sa.sin6_port; ++ } + + #ifdef ICMP6_FILTER ++ if(!using_dgram) + { + struct icmp6_filter filt; + if (!(option_mask32 & OPT_VERBOSE)) { +@@ -890,7 +961,7 @@ static int common_ping_main(int opt, char **argv) + if (opt & OPT_p) + G.pattern = xstrtou_range(str_p, 16, 0, 255); + +- myid = (uint16_t) getpid(); ++ if (!using_dgram) myid = (uint16_t) getpid(); + hostname = argv[optind]; + #if ENABLE_PING6 + { +-- +2.16.2 + |