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synced 2025-05-15 00:31:51 -04:00
03a9755147
The code has multiple issues making it unusable with modern FreeBSD: * it uses long gone ascii2addr() function removed in 2007; * it passes hardcoded "/usr/lib/libc.so" path to dlopen(), but now it is plain text hint file; * this IPv4-only code neglects to check passed domain for PF_INET messing with sockets in other domains (like PF_INET6, PF_LOCAL). Still, it is very useful while dealing with software like Nagios that does not support binding to specific IPv4 address for outgoing connections. The library solves the problem with single line in /etc/rc.conf: nagios_env="LD_PRELOAD=/usr/local/lib/libsocketbind.so.1 BINDTO=192.168.6.1" This changes unbreaks the library making it usable again.
45 lines
1,014 B
C
45 lines
1,014 B
C
#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <dlfcn.h>
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#include <stdlib.h>
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static void *socket_p = NULL;
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static struct sockaddr_in bind_addr;
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static int do_bind;
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int socket(int domain, int type, int protocol) {
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auto int res;
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if (socket_p == NULL) {
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char *str;
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socket_p = dlsym(RTLD_NEXT, "socket");
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if (!socket_p)
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return -1;
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#ifdef DEBUG
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printf("Loaded socket %x\n", socket_p);
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#endif
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if ((domain == PF_INET) && (str = getenv("BINDTO")) != NULL) {
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#ifdef DEBUG
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printf("Thinking about bind\n");
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#endif
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if (inet_aton(str, &bind_addr.sin_addr)) {
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do_bind = 1;
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bind_addr.sin_len = INET_ADDRSTRLEN;
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bind_addr.sin_family = AF_INET;
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#ifdef DEBUG
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printf("WILL DO BIND %s, %x\n", str, bind_addr.sin_addr.s_addr);
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#endif
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}
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}
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}
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res = ((int(*)(int a, int b, int c))socket_p)(domain, type, protocol);
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if (do_bind) {
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bind(res, (struct sockaddr*)&bind_addr, INET_ADDRSTRLEN);
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}
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return res;
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};
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