89 lines
2.3 KiB
Diff
89 lines
2.3 KiB
Diff
From ef844e18aad75929bad415bbc633a760890501e8 Mon Sep 17 00:00:00 2001
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From: timdiels <timdiels.m@gmail.com>
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Date: Mon, 30 Sep 2013 18:27:13 +0200
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Subject: [PATCH] Fixed bug in client argument parsing
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e.g. pwnat -c 44444 a b 22
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would recognise "b" as proxy port, and eventually crash with a segfault
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---
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udpclient.c | 45 ++++++++++++++++++++++++++++-----------------
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1 file changed, 28 insertions(+), 17 deletions(-)
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diff --git udpclient.c udpclient.c
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index a95ac50..0d23c0d 100644
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--- udpclient.c
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+++ udpclient.c
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@@ -60,7 +60,20 @@ static void disconnect_and_remove_client(uint16_t id, list_t *clients,
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fd_set *fds);
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static void signal_handler(int sig);
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-int udpclient(int argc, char *argv[])
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+bool isnumber(const char* str) {
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+ if (!str) {
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+ return false;
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+ }
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+
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+ char* end;
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+ strtol(str, &end, 10);
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+ return *end == '\0';
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+}
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+
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+/*
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+ * argv: [local ip] <local port> <proxy host> [proxy port] <remote host> <remote port>
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+ */
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+int udpclient(int argc, char* argv[])
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{
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char *lhost, *lport, *phost, *pport, *rhost, *rport;
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list_t *clients;
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@@ -72,7 +85,7 @@ int udpclient(int argc, char *argv[])
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socket_t *udp_sock = NULL;
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char data[MSG_MAX_LEN];
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char addrstr[ADDRSTRLEN];
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- char pport_s[6];
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+ char pport_s[6] = "2222";
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struct timeval curr_time;
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struct timeval check_time;
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@@ -89,29 +102,27 @@ int udpclient(int argc, char *argv[])
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int ret;
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int i;
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- int icmp_sock = 0;
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+ int icmp_sock = 0;
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int timeexc = 0;
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- struct sockaddr_in src, dest, rsrc;
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- struct hostent *hp;
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- uint32_t timeexc_ip;
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+ struct sockaddr_in src, dest, rsrc;
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+ struct hostent *hp;
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+ uint32_t timeexc_ip;
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signal(SIGINT, &signal_handler);
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+ // Parse arguments
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i = 0;
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- if (index(argv[i], 58) || index(argv[i], 46))
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- lhost = argv[i++];
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- else
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- lhost = NULL;
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+ if (!isnumber(argv[i]))
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+ lhost = argv[i++];
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+ else
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+ lhost = NULL;
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lport = argv[i++];
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phost = argv[i++];
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- if (index(argv[i], 58) || index(argv[i], 46))
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- {
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- snprintf(pport_s, 5, "2222");
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- pport = pport_s;
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- }
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- else
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- pport = argv[i++];
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+ if (isnumber(argv[i]))
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+ pport = argv[i++];
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+ else
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+ pport = pport_s;
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rhost = argv[i++];
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rport = argv[i++];
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