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util.c

/*
 * Copyright (C) 2006-2008 Stig Venaas <venaas@uninett.no>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 */

#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/select.h>
#include <stdarg.h>
#include "debug.h"
#include "util.h"

char *stringcopy(const char *s, int len) {
    char *r;
    if (!s)
      return NULL;
    if (!len)
      len = strlen(s);
    r = malloc(len + 1);
    if (!r)
      debug(DBG_ERR, "stringcopy: malloc failed");
    memcpy(r, s, len);
    r[len] = '\0';
    return r;
}

void printfchars(char *prefixfmt, char *prefix, char *charfmt, char *chars, int len) {
    int i;
    unsigned char *s = (unsigned char *)chars;
    if (prefix)
      printf(prefixfmt ? prefixfmt : "%s: ", prefix);
    for (i = 0; i < len; i++)
      printf(charfmt ? charfmt : "%c", s[i]);
    printf("\n");
}

void port_set(struct sockaddr *sa, uint16_t port) {
    switch (sa->sa_family) {
    case AF_INET:
      ((struct sockaddr_in *)sa)->sin_port = htons(port);
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)sa)->sin6_port = htons(port);
      break;
    }
}

struct sockaddr *addr_copy(struct sockaddr *in) {
    struct sockaddr *out = NULL;
    
    switch (in->sa_family) {
    case AF_INET:
      out = malloc(sizeof(struct sockaddr_in));
      if (out) {
          memset(out, 0, sizeof(struct sockaddr_in));
          ((struct sockaddr_in *)out)->sin_addr = ((struct sockaddr_in *)in)->sin_addr;
      }
      break;
    case AF_INET6:
      out = malloc(sizeof(struct sockaddr_in6));
      if (out) {
          memset(out, 0, sizeof(struct sockaddr_in6));
          ((struct sockaddr_in6 *)out)->sin6_addr = ((struct sockaddr_in6 *)in)->sin6_addr;
      }
      break;
    }
    out->sa_family = in->sa_family;
#ifdef SIN6_LEN
    out->sa_len = in->sa_len;
#endif
    return out;
}

char *addr2string(struct sockaddr *addr) {
    struct sockaddr_in6 *sa6;
    struct sockaddr_in sa4;
    static char addr_buf[2][INET6_ADDRSTRLEN];
    static int i = 0;
    i = !i;
    if (addr->sa_family == AF_INET6) {
      sa6 = (struct sockaddr_in6 *)addr;
      if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
          memset(&sa4, 0, sizeof(sa4));
          sa4.sin_family = AF_INET;
          sa4.sin_port = sa6->sin6_port;
          memcpy(&sa4.sin_addr, &sa6->sin6_addr.s6_addr[12], 4);
          addr = (struct sockaddr *)&sa4;
      }
    }
    if (getnameinfo(addr, SOCKADDRP_SIZE(addr), addr_buf[i], sizeof(addr_buf[i]),
                    NULL, 0, NI_NUMERICHOST)) {
        debug(DBG_WARN, "getnameinfo failed");
        return "getnameinfo_failed";
    }
    return addr_buf[i];
}

#if 0
/* not in use */
int connectport(int type, char *host, char *port) {
    struct addrinfo hints, *res0, *res;
    int s = -1;
    
    memset(&hints, 0, sizeof(hints));
    hints.ai_socktype = type;
    hints.ai_family = AF_UNSPEC;

    if (getaddrinfo(host, port, &hints, &res0) != 0) {
      debug(DBG_ERR, "connectport: can't resolve host %s port %s", host, port);
      return -1;
    }

    for (res = res0; res; res = res->ai_next) {
      s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
      if (s < 0) {
          debug(DBG_WARN, "connectport: socket failed");
          continue;
      }
      if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
          break;
      debug(DBG_WARN, "connectport: connect failed");
      close(s);
      s = -1;
    }
    freeaddrinfo(res0);
    return s;
}
#endif

int bindtoaddr(struct addrinfo *addrinfo, int family, int reuse, int v6only) {
    int s, on = 1;
    struct addrinfo *res;

    for (res = addrinfo; res; res = res->ai_next) {
      if (family != AF_UNSPEC && family != res->ai_family)
          continue;
      s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
      if (s < 0) {
          debug(DBG_WARN, "bindtoaddr: socket failed");
          continue;
      }
      if (reuse)
          setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
      #ifdef IPV6_V6ONLY
      if (v6only)
          setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
      #endif
      if (!bind(s, res->ai_addr, res->ai_addrlen))
          return s;
      debug(DBG_WARN, "bindtoaddr: bind failed");
      close(s);
    }
    return -1;
}

int connectnonblocking(int s, const struct sockaddr *addr, socklen_t addrlen, struct timeval *timeout) {
    int origflags, error = 0, r = -1;
    fd_set writefds;
    socklen_t len;
    
    origflags = fcntl(s, F_GETFL, 0);
    fcntl(s, F_SETFL, origflags | O_NONBLOCK);
    if (!connect(s, addr, addrlen)) {
      r = 0;
      goto exit;
    }
    if (errno != EINPROGRESS)
      goto exit;

    FD_ZERO(&writefds);
    FD_SET(s, &writefds);
    if (select(s + 1, NULL, &writefds, NULL, timeout) < 1)
      goto exit;

    len = sizeof(error);
    if (!getsockopt(s, SOL_SOCKET, SO_ERROR, (char*)&error, &len) && !error)
      r = 0;

 exit:    
    fcntl(s, F_SETFL, origflags);
    return r;
}

int connecttcp(struct addrinfo *addrinfo, struct addrinfo *src, uint16_t timeout) {
    int s;
    struct addrinfo *res;
    struct timeval to;

    s = -1;
    if (timeout) {
      if (addrinfo && addrinfo->ai_next && timeout > 5)
          timeout = 5;
      to.tv_sec = timeout;
      to.tv_usec = 0;
    }
    
    for (res = addrinfo; res; res = res->ai_next) {
      s = bindtoaddr(src, res->ai_family, 1, 1);
      if (s < 0) {
          debug(DBG_WARN, "connecttoserver: socket failed");
          continue;
      }
      if ((timeout
           ? connectnonblocking(s, res->ai_addr, res->ai_addrlen, &to)
           : connect(s, res->ai_addr, res->ai_addrlen)) == 0)
          break;
      debug(DBG_WARN, "connecttoserver: connect failed");
      close(s);
      s = -1;
    }
    return s;
}

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