sock_ntop()函数的实现
#include "unp.h" #ifdef HAVE_SOCKADDR_DL_STRUCT#include <net/if_dl.h>#endif /* include sock_ntop */char *sock_ntop(const struct sockaddr *sa, socklen_t salen){ char portstr; static char str; /* Unix domain is largest */ switch (sa->sa_family) { case AF_INET: { struct sockaddr_in*sin = (struct sockaddr_in *) sa; if (inet_ntop(AF_INET, &sin->sin_addr, str, sizeof(str)) == NULL) return(NULL); if (ntohs(sin->sin_port) != 0) { snprintf(portstr, sizeof(portstr), ":%d", ntohs(sin->sin_port)); strcat(str, portstr); } return(str); }/* end sock_ntop */ #ifdef IPV6 case AF_INET6: { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) sa; str = '['; if (inet_ntop(AF_INET6, &sin6->sin6_addr, str + 1, sizeof(str) - 1) == NULL) return(NULL); if (ntohs(sin6->sin6_port) != 0) { snprintf(portstr, sizeof(portstr), "]:%d", ntohs(sin6->sin6_port)); strcat(str, portstr); return(str); } return (str + 1); }#endif #ifdef AF_UNIX case AF_UNIX: { struct sockaddr_un*unp = (struct sockaddr_un *) sa; /* OK to have no pathname bound to the socket: happens on every connect() unless client calls bind() first. */ if (unp->sun_path == 0) strcpy(str, "(no pathname bound)"); else snprintf(str, sizeof(str), "%s", unp->sun_path); return(str); }#endif #ifdef HAVE_SOCKADDR_DL_STRUCT case AF_LINK: { struct sockaddr_dl*sdl = (struct sockaddr_dl *) sa; if (sdl->sdl_nlen > 0) snprintf(str, sizeof(str), "%*s (index %d)", sdl->sdl_nlen, &sdl->sdl_data, sdl->sdl_index); else snprintf(str, sizeof(str), "AF_LINK, index=%d", sdl->sdl_index); return(str); }#endif default: snprintf(str, sizeof(str), "sock_ntop: unknown AF_xxx: %d, len %d", sa->sa_family, salen); return(str); } return (NULL);} char *Sock_ntop(const struct sockaddr *sa, socklen_t salen){ char *ptr; if ( (ptr = sock_ntop(sa, salen)) == NULL) err_sys("sock_ntop error"); /* inet_ntop() sets errno */ return(ptr);}
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