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/*
* client.c -- connect to a server
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <h/mh.h>
#include <h/mts.h>
#include <h/utils.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#define MAXARGS 1000
/*
* static prototypes
*/
/* client's own static version of several nmh subroutines */
static char **client_brkstring (char *, char *, char *);
static int client_brkany (char, char *);
static char **client_copyip (char **, char **, int);
static char *client_getcpy (char *);
static void client_freelist(char **);
int
client (char *args, char *service, char *response, int len_response, int debug)
{
int sd, rc;
char **ap, *arguments[MAXARGS];
struct addrinfo hints, *res, *ai;
ap = arguments;
if (args != NULL && *args != 0) {
ap = client_copyip (client_brkstring (client_getcpy (args), " ", "\n"),
ap, MAXARGS);
} else {
if (servers != NULL && *servers != 0)
ap = client_copyip (client_brkstring (client_getcpy (servers), " ", "\n"),
ap, MAXARGS);
}
if (ap == arguments) {
*ap++ = client_getcpy ("localhost");
*ap = NULL;
}
memset(&hints, 0, sizeof(hints));
#ifdef AI_ADDRCONFIG
hints.ai_flags = AI_ADDRCONFIG;
#endif
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
for (ap = arguments; *ap; ap++) {
if (debug) {
fprintf(stderr, "Trying to connect to \"%s\" ...\n", *ap);
}
rc = getaddrinfo(*ap, service, &hints, &res);
if (rc) {
if (debug) {
fprintf(stderr, "Lookup of \"%s\" failed: %s\n", *ap,
gai_strerror(rc));
}
continue;
}
for (ai = res; ai != NULL; ai = ai->ai_next) {
if (debug) {
char address[NI_MAXHOST];
char port[NI_MAXSERV];
rc = getnameinfo(ai->ai_addr, ai->ai_addrlen, address,
sizeof(address), port, sizeof port,
NI_NUMERICHOST | NI_NUMERICSERV);
fprintf(stderr, "Connecting to %s:%s...\n",
rc ? "unknown" : address,
rc ? "--" : port);
}
sd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sd < 0) {
if (debug)
fprintf(stderr, "socket() failed: %s\n", strerror(errno));
continue;
}
if (connect(sd, ai->ai_addr, ai->ai_addrlen) == 0) {
freeaddrinfo(res);
client_freelist(arguments);
return sd;
}
if (debug) {
fprintf(stderr, "Connection failed: %s\n", strerror(errno));
}
close(sd);
}
freeaddrinfo(res);
}
client_freelist(arguments);
strncpy (response, "no servers available", len_response);
return NOTOK;
}
/*
* Free a list of strings
*/
static void
client_freelist(char **list)
{
free(*list);
}
/*
* static copies of three nmh subroutines
*/
static char *broken[MAXARGS + 1];
static char **
client_brkstring (char *strg, char *brksep, char *brkterm)
{
register int bi;
register char c, *sp;
sp = strg;
for (bi = 0; bi < MAXARGS; bi++) {
while (client_brkany (c = *sp, brksep))
*sp++ = 0;
if (!c || client_brkany (c, brkterm)) {
*sp = 0;
broken[bi] = 0;
return broken;
}
broken[bi] = sp;
while ((c = *++sp) && !client_brkany (c, brksep) && !client_brkany (c, brkterm))
continue;
}
broken[MAXARGS] = 0;
return broken;
}
/*
* returns 1 if chr in strg, 0 otherwise
*/
static int
client_brkany (char chr, char *strg)
{
register char *sp;
if (strg)
for (sp = strg; *sp; sp++)
if (chr == *sp)
return 1;
return 0;
}
/*
* copy a string array and return pointer to end
*/
static char **
client_copyip (char **p, char **q, int len_q)
{
while (*p && --len_q > 0)
*q++ = *p++;
*q = NULL;
return q;
}
static char *
client_getcpy (char *str)
{
char *cp;
size_t len;
len = strlen(str) + 1;
cp = mh_xmalloc(len);
memcpy (cp, str, len);
return cp;
}
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