diff options
Diffstat (limited to 'fake-getaddrinfo.c')
-rw-r--r-- | fake-getaddrinfo.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/fake-getaddrinfo.c b/fake-getaddrinfo.c new file mode 100644 index 00000000..b918798c --- /dev/null +++ b/fake-getaddrinfo.c @@ -0,0 +1,119 @@ +/* + * fake library for ssh + * + * This file includes getaddrinfo(), freeaddrinfo() and gai_strerror(). + * These funtions are defined in rfc2133. + * + * But these functions are not implemented correctly. The minimum subset + * is implemented for ssh use only. For exapmle, this routine assumes + * that ai_family is AF_INET. Don't use it for another purpose. + * + * In the case not using 'configure --enable-ipv6', this getaddrinfo.c + * will be used if you have broken getaddrinfo or no getaddrinfo. + */ + +#include "includes.h" +#include "ssh.h" + +#ifndef HAVE_GAI_STRERROR +char * +gai_strerror(ecode) +int ecode; +{ + switch (ecode) { + case EAI_NODATA: + return "no address associated with hostname."; + case EAI_MEMORY: + return "memory allocation failure."; + default: + return "unknown error."; + } +} +#endif /* !HAVE_GAI_STRERROR */ + +#ifndef HAVE_FREEADDRINFO +void +freeaddrinfo(ai) +struct addrinfo *ai; +{ + struct addrinfo *next; + + do { + next = ai->ai_next; + free(ai); + } while (ai = next); +} +#endif /* !HAVE_FREEADDRINFO */ + +#ifndef HAVE_GETADDRINFO +static struct addrinfo * +malloc_ai(port, addr) +int port; +u_long addr; +{ + struct addrinfo *ai; + + if (ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) + + sizeof(struct sockaddr_in))) { + memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in)); + ai->ai_addr = (struct sockaddr *)(ai + 1); + /* XXX -- ssh doesn't use sa_len */ + ai->ai_addrlen = sizeof(struct sockaddr_in); + ai->ai_addr->sa_family = ai->ai_family = AF_INET; + ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port; + ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr; + return ai; + } else { + return NULL; + } +} + +int +getaddrinfo(hostname, servname, hints, res) +const char *hostname, *servname; +const struct addrinfo *hints; +struct addrinfo **res; +{ + struct addrinfo *cur, *prev = NULL; + struct hostent *hp; + int i, port; + + if (servname) + port = htons(atoi(servname)); + else + port = 0; + if (hints && hints->ai_flags & AI_PASSIVE) + if (*res = malloc_ai(port, htonl(0x00000000))) + return 0; + else + return EAI_MEMORY; + if (!hostname) + if (*res = malloc_ai(port, htonl(0x7f000001))) + return 0; + else + return EAI_MEMORY; + if (inet_addr(hostname) != -1) + if (*res = malloc_ai(port, inet_addr(hostname))) + return 0; + else + return EAI_MEMORY; + if ((hp = gethostbyname(hostname)) && + hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) { + for (i = 0; hp->h_addr_list[i]; i++) + if (cur = malloc_ai(port, + ((struct in_addr *)hp->h_addr_list[i])->s_addr)) { + if (prev) + prev->ai_next = cur; + else + *res = cur; + prev = cur; + } else { + if (*res) + freeaddrinfo(*res); + return EAI_MEMORY; + } + return 0; + } + return EAI_NODATA; +} +#endif /* !HAVE_GETADDRINFO */ |