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：
|
1 2 3 4 5 |
// 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：
|
1 |
apt-get install tesseract-ocr |
认证：
|
1 |
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-6742734ec64502728 […]
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……
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 |
#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; } |