学校的校园网是Block了各客户端之间的L2通讯了，通过中兴认证后，虽然两台计算机获取到的IP处于相同网段，但仍然无法互访。 处于相同网段的计算机，默认情况下要相互通讯，首先要通过ARP协议，取得对方MAC地址。 主要是L2被Block后，ARP数据包无法相互送达了，获取MAC地址上就出了问题，所以导致了同网段的机子之间无法互访。 L2不通，L3还是可以的，实现方法是修改路由表。 我学校的校园网网段是10.20.64.0/21，因此命令如下：
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// Windows route change 10.20.64.0 mask 255.255.248.0 10.20.64.1 // Linux ip route change 10.20.64.0/21 via 10.20.64.1 |
注意我这里用的都是change，而不是add，因为系统默认已经有一条通过MAC地址互访 […]
今天起天翼认证，验证码不能为空了。 用到了tesseract-ocr：
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apt-get install tesseract-ocr |
认证：
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curl "http://enet.10000.gd.cn:10001/login.do" -d "userName1=网页认证用户名&password1=网页认证密码&eduuser=DHCP分配到的IP&edubas=113.98.10.136&rand=$(curl -c /tmp/webauth_cookie http://enet.10000.gd.cn:10001/common/image.jsp | tesseract - -)" -b /tmp/webauth_cookie |
对于Linux服务器，有时需要开放登录权限给一部分用户，但并非所有用户都愿意安分守己，也无法知道谁是不安分守己的，给多一个这些用户开放登录权限，系统的威胁就多了一分。 目前来说比较好的方案是chroot，调用了chroot()，就能把的根目录改成指定的根目录。何为根目录？顾名思义，“根”就是所有目录的“根”，一切目录均从“根”而生，没有“根”就没有其他目录，换句话说，“根目录”就是最原始的目录。你无法访问“根”之前前的数据，没有“根”的时候，怎么可以发展数据呢？ 二进制程序chroot乃GNU的核心程序中的一个，Linux发行版本一般都有Coreutils，不过二进制版的chroot在这种情况 […]
数天前与一个学校中的朋友闲聊，对方提到了使用Hostker的经历，涉及到了一项“按CPU时间”计费的功能。 个人来说，是挺欣赏这一项收费策略的，毕竟有多少个使用虚拟主机的用户，就有多少种不同资源需求量，按照PHP对CPU资源的使用情况来计费，不仅实现公平收费，还能逼那些让资源占用多的用户占得谨慎点，比用CloudLinux的那些逼格高得多哈！ 既然如此，就自己来动手实现一个。 计算CPU时间，并不难实现，Unix Like有提供这一个系统调用，所以嘛，根本不需要你自己计算…… 我所知道相关的系统调用有两个，以下是他们的函数原型： [crayon-67711abe359896778 […]
我只是不想遍历比较那个个字符串数组而已，内存占用可能比较多，不过我相信时间绝对比遍历比较字符串数组要短，CPU占用也少。 不好Free，所以就不手动Free了……
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#include <stdio.h> #include <string.h> #include <stdlib.h> struct balloon_index { struct balloon_index *a; struct balloon_index *b; struct balloon_index *c; struct balloon_index *d; struct balloon_index *e; struct balloon_index *f; struct balloon_index *g; struct balloon_index *h; struct balloon_index *i; struct balloon_index *j; struct balloon_index *k; struct balloon_index *l; struct balloon_index *m; struct balloon_index *n; struct balloon_index *o; struct balloon_index *p; struct balloon_index *q; struct balloon_index *r; struct balloon_index *s; struct balloon_index *t; struct balloon_index *u; struct balloon_index *v; struct balloon_index *w; struct balloon_index *x; struct balloon_index *y; struct balloon_index *z; int count; }; struct balloon_index *struct_inital(); int main() { struct balloon_index *start, *pointer1, **pointer2; int amount, i, ii, len, max_count; char color[16], max[16]; while (1) { scanf("%d", &amount); if (amount == 0) break; start = struct_inital(); max_count = 0; for (i = 1; i <= amount; i++) { scanf("%s", color); pointer1 = start; len = strlen(color); for (ii = 0; ii <= len; ii++) { switch (color[ii]) { case 'a': pointer2 = &pointer1->a; pointer1 = pointer1->a; break; case 'b': pointer2 = &pointer1->b; pointer1 = pointer1->b; break; case 'c': pointer2 = &pointer1->c; pointer1 = pointer1->c; break; case 'd': pointer2 = &pointer1->d; pointer1 = pointer1->d; break; case 'e': pointer2 = &pointer1->e; pointer1 = pointer1->e; break; case 'f': pointer2 = &pointer1->f; pointer1 = pointer1->f; break; case 'g': pointer2 = &pointer1->g; pointer1 = pointer1->g; break; case 'h': pointer2 = &pointer1->h; pointer1 = pointer1->h; break; case 'i': pointer2 = &pointer1->i; pointer1 = pointer1->i; break; case 'j': pointer2 = &pointer1->j; pointer1 = pointer1->j; break; case 'k': pointer2 = &pointer1->k; pointer1 = pointer1->k; break; case 'l': pointer2 = &pointer1->l; pointer1 = pointer1->l; break; case 'm': pointer2 = &pointer1->m; pointer1 = pointer1->m; break; case 'n': pointer2 = &pointer1->n; pointer1 = pointer1->n; break; case 'o': pointer2 = &pointer1->o; pointer1 = pointer1->o; break; case 'p': pointer2 = &pointer1->p; pointer1 = pointer1->p; break; case 'q': pointer2 = &pointer1->q; pointer1 = pointer1->q; break; case 'r': pointer2 = &pointer1->r; pointer1 = pointer1->r; break; case 's': pointer2 = &pointer1->s; pointer1 = pointer1->s; break; case 't': pointer2 = &pointer1->t; pointer1 = pointer1->t; break; case 'u': pointer2 = &pointer1->u; pointer1 = pointer1->u; break; case 'v': pointer2 = &pointer1->v; pointer1 = pointer1->v; break; case 'w': pointer2 = &pointer1->w; pointer1 = pointer1->w; break; case 'x': pointer2 = &pointer1->x; pointer1 = pointer1->x; break; case 'y': pointer2 = &pointer1->y; pointer1 = pointer1->y; break; case 'z': pointer2 = &pointer1->z; pointer1 = pointer1->z; break; case '\0': pointer1->count++; if (pointer1->count >= max_count) { max_count = pointer1->count; strcpy(max, color); } } if (pointer1 == NULL) { *pointer2 = struct_inital(); pointer1 = *pointer2; } } } printf("%s\n", max); } return 0; } struct balloon_index *struct_inital() { struct balloon_index *index; index = (struct balloon_index *) malloc(sizeof(struct balloon_index)); index->a = index->b = index->c = index->d = index->e = index->f = index->g = index->h = index->i = index->j = index->k = index->l = index->m = index->n = index->o = index->p = index->q = index->r = index->s = index->t = index->u = index->v = index->w = index->x = index->y = index->z = NULL; index->count = 0; return index; } |