/*>void RunJob(char *queueDir, int jobID, int verbose)
---------------------------------------------------
*//**
\param[in] queueDir Queue directory
\param[in] jobID Job number
\param[in] verbose Verbosity level
Actually runs a job
- 16.10.15 Original By: ACRM
- 19.10.15 Now uses GetOwner()
*/
void RunJob(char *queueDir, int jobID, int verbose)
{
char jobFile[MAXBUFF],
pwd[MAXBUFF],
job[MAXBUFF],
exe[MAXBUFF],
cmd[MAXBUFF];
FILE *fp;
sprintf(jobFile, "%s/%d", queueDir, jobID);
if(verbose)
{
char msg[MAXBUFF];
sprintf(msg, "Running job %d", jobID);
Message(PROGNAME, MSG_INFO, msg);
}
if((fp=fopen(jobFile, "r"))!=NULL)
{
char *username;
/* Find the owner of the job file */
username = GetOwner(queueDir, jobID);
/* Get the working directory for running the job */
if(!fgets(pwd, MAXBUFF, fp))
CLOSE_AND_RETURN(fp, jobID);
TERMINATE(pwd);
/* Get the job itself */
if(!fgets(job, MAXBUFF, fp))
CLOSE_AND_RETURN(fp, jobID);
TERMINATE(job);
fclose(fp);
/* Run the job as the requested user */
sprintf(cmd, "(cd %s; %s)", pwd, job);
sprintf(exe, "su - %s -c \"%s\"", username, cmd);
if(verbose >= 2)
{
char msg[MAXBUFF];
sprintf(msg, "Command is: %s", cmd);
Message(PROGNAME, MSG_INFO, msg);
}
if(verbose >= 3)
{
char msg[MAXBUFF];
sprintf(msg, "Expanded command is: %s", exe);
Message(PROGNAME, MSG_INFO, msg);
}
system(exe);
/* Remove the job from the queue */
unlink(jobFile);
}
}
int dns_getaddr(const char *host, struct in_addr *addr, st_utime_t timeout)
{
char name[MAXDNAME], **domain;
const char *cp;
int s, n, maxlen, dots;
int trailing_dot, tried_as_is;
st_netfd_t nfd;
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
h_errno = NETDB_INTERNAL;
return -1;
}
if (_res.options & RES_USEVC) {
h_errno = NETDB_INTERNAL;
errno = ENOSYS;
return -1;
}
if (!host || *host == '\0') {
h_errno = HOST_NOT_FOUND;
return -1;
}
/* Create UDP socket */
if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
h_errno = NETDB_INTERNAL;
return -1;
}
if ((nfd = st_netfd_open_socket(s)) == NULL) {
h_errno = NETDB_INTERNAL;
n = errno;
close(s);
errno = n;
return -1;
}
maxlen = sizeof(name) - 1;
n = 0;
dots = 0;
trailing_dot = 0;
tried_as_is = 0;
for (cp = host; *cp && n < maxlen; cp++) {
dots += (*cp == '.');
name[n++] = *cp;
}
if (name[n - 1] == '.')
trailing_dot = 1;
/*
* If there are dots in the name already, let's just give it a try
* 'as is'. The threshold can be set with the "ndots" option.
*/
if (dots >= _res.ndots) {
if (query_domain(nfd, host, addr, timeout) == 0)
CLOSE_AND_RETURN(0);
if (h_errno == NETDB_INTERNAL && errno == EINTR)
CLOSE_AND_RETURN(-1);
tried_as_is = 1;
}
/*
* We do at least one level of search if
* - there is no dot and RES_DEFNAME is set, or
* - there is at least one dot, there is no trailing dot,
* and RES_DNSRCH is set.
*/
if ((!dots && (_res.options & RES_DEFNAMES)) ||
(dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
name[n++] = '.';
for (domain = _res.dnsrch; *domain; domain++) {
strncpy(name + n, *domain, maxlen - n);
if (query_domain(nfd, name, addr, timeout) == 0)
CLOSE_AND_RETURN(0);
if (h_errno == NETDB_INTERNAL && errno == EINTR)
CLOSE_AND_RETURN(-1);
if (!(_res.options & RES_DNSRCH))
break;
}
}
/*
* If we have not already tried the name "as is", do that now.
* note that we do this regardless of how many dots were in the
* name or whether it ends with a dot.
*/
if (!tried_as_is) {
if (query_domain(nfd, host, addr, timeout) == 0)
CLOSE_AND_RETURN(0);
}
CLOSE_AND_RETURN(-1);
}
int dns_getaddr(const char *hosttest, struct in_addr *addr, st_utime_t timeout)
{
//return 0;
// host="www.baidu.com";
#if 0
char *host=malloc(128);
memset(host,0,128);
strcpy(host,hosttest);
#endif
char host[128];
memset(host,0,128);
strcpy(host,hosttest);
LOGD("hosttest [%s] host[%s]",hosttest,host);
char name[MAXDNAME], **domain;
const char *cp;
int s, n, maxlen, dots;
int trailing_dot, tried_as_is;
st_netfd_t nfd;
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
h_errno = NETDB_INTERNAL;
return -1;
}
if (_res.options & RES_USEVC) {
h_errno = NETDB_INTERNAL;
errno = ENOSYS;
return -1;
}
if (!host || *host == '\0') {
h_errno = HOST_NOT_FOUND;
return -1;
}
/* Create UDP socket */
if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
h_errno = NETDB_INTERNAL;
return -1;
}
if ((nfd = st_netfd_open_socket(s)) == NULL) {
h_errno = NETDB_INTERNAL;
n = errno; //n用来记录错误号
close(s);
errno = n;
return -1;
}
//可以走到这里
maxlen = sizeof(name) - 1;
LOGD("maxlen[%d]",maxlen);
n = 0; //此时n是计数器
dots = 0;
trailing_dot = 0;
tried_as_is = 0;
for (cp = host; *cp && n < maxlen; cp++) {
//dots记录host中有几个.
dots += (*cp == '.'); //走这里
name[n++] = *cp; //看起来好像是复制host到name中
}
//n是后加，所以n-1，此时n-1对应的是最后一个字符
if (name[n - 1] == '.')
trailing_dot = 1;
LOGD("========AAA===name[%s]=========",name);
/*
* If there are dots in the name already, let's just give it a try
* 'as is'. The threshold can be set with the "ndots" option.
*/
if (dots >= _res.ndots) {
if (query_domain(nfd, host, addr, timeout) == 0)
{
/*貌似我的query域名就是返回0，只好关闭并且退出了*/
// LOGD("query_domain return 0");
/*不管我是否注释掉这句话都有段错误*/
return 0;
#if 0
CLOSE_AND_RETURN(0);
#else
int ret=0;
LOGD("===BB==========");
// LOGD("%-40s %s", (char *)host, inet_ntoa(addr));
// LOGD("DO RETURN ret[%d]",ret);
//LOGD(" errno[%d]",errno);
// n = errno;
// st_netfd_close(nfd);
// errno = n;
return -1;
// goto ZBTEST;
#endif
//下面这句话不被执行，上面的return直接退出了这个函数
slogi("query_domain WILL NOT HERE");
}
if (h_errno == NETDB_INTERNAL && errno == EINTR)
CLOSE_AND_RETURN(-1);
tried_as_is = 1;
}
/*
* We do at least one level of search if
* - there is no dot and RES_DEFNAME is set, or
* - there is at least one dot, there is no trailing dot,
* and RES_DNSRCH is set.
*/
if ((!dots && (_res.options & RES_DEFNAMES)) ||
(dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
name[n++] = '.';
for (domain = _res.dnsrch; *domain; domain++) {
strncpy(name + n, *domain, maxlen - n);
if (query_domain(nfd, name, addr, timeout) == 0)
CLOSE_AND_RETURN(0);
if (h_errno == NETDB_INTERNAL && errno == EINTR)
CLOSE_AND_RETURN(-1);
if (!(_res.options & RES_DNSRCH))
break;
}
}
/*
* If we have not already tried the name "as is", do that now.
* note that we do this regardless of how many dots were in the
* name or whether it ends with a dot.
*/
if (!tried_as_is) {
if (query_domain(nfd, host, addr, timeout) == 0)
{
//LOGD("===HERE=query_domain");
LOGD("----1----query_domain------");
CLOSE_AND_RETURN(0);
}
}
CLOSE_AND_RETURN(-1);
// ZBTEST:
// LOGD("ZBTEST");
// return 0;
}
