mirror of
https://github.com/checkpoint-restore/criu
synced 2025-08-29 05:18:00 +00:00
bcf9ee3d1c
This patch does s/$fdset->fds[$nr]/fdset_fd($fdset, $nr)/ over the code. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
130 lines
2.1 KiB
C
130 lines
2.1 KiB
C
#include <unistd.h>
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#include <fcntl.h>
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#include <sys/utsname.h>
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#include "util.h"
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#include "crtools.h"
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#include "syscall.h"
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#include "namespaces.h"
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#include "sysctl.h"
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static int dump_uts_string(int fd, const char *str)
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{
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int ret;
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u32 len;
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len = strlen(str);
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ret = write_img(fd, &len);
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if (!ret)
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ret = write_img_buf(fd, str, len);
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return ret;
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}
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int dump_uts_ns(int ns_pid, struct cr_fdset *fdset)
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{
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int fd, ret;
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struct utsname ubuf;
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ret = switch_ns(ns_pid, CLONE_NEWUTS, "uts");
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if (ret < 0)
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return ret;
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ret = uname(&ubuf);
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if (ret < 0) {
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pr_perror("Error calling uname");
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return ret;
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}
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fd = fdset_fd(fdset, CR_FD_UTSNS);
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ret = dump_uts_string(fd, ubuf.nodename);
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if (!ret)
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ret = dump_uts_string(fd, ubuf.domainname);
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return ret;
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}
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static int read_uts_str(int fd, char *n, int size)
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{
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int ret;
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u32 len;
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ret = read_img(fd, &len);
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if (ret < 0)
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return -1;
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if (len >= size) {
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pr_err("Corrupted %s\n", n);
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return -1;
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}
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ret = read_img_buf(fd, n, len);
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if (ret < 0)
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return -1;
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n[len] = '\0';
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return 0;
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}
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int prepare_utsns(int pid)
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{
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int fd, ret;
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u32 len;
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char hostname[65];
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char domainname[65];
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struct sysctl_req req[] = {
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{ "kernel/hostname", hostname, CTL_STR(sizeof(hostname)) },
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{ "kernel/domainname", domainname, CTL_STR(sizeof(hostname)) },
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{ },
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};
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fd = open_image_ro(CR_FD_UTSNS, pid);
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if (fd < 0)
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return -1;
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ret = read_uts_str(fd, hostname, sizeof(hostname));
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if (ret < 0)
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goto out;
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ret = read_uts_str(fd, domainname, sizeof(domainname));
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if (ret < 0)
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goto out;
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ret = sysctl_op(req, CTL_WRITE);
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out:
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close(fd);
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return ret;
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}
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static void show_uts_string(int fd, char *n)
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{
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int ret;
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u32 len;
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char str[65];
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ret = read_img_eof(fd, &len);
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if (ret > 0) {
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if (len >= sizeof(str)) {
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pr_err("Corrupted hostname\n");
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return;
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}
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ret = read_img_buf(fd, str, len);
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if (ret < 0)
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return;
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str[len] = '\0';
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pr_info("%s: [%s]\n", n, str);
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}
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}
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void show_utsns(int fd)
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{
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pr_img_head(CR_FD_UTSNS);
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show_uts_string(fd, "hostname");
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show_uts_string(fd, "domainname");
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pr_img_tail(CR_FD_UTSNS);
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}
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